Serious Explorations Ford Explorer and Ranger Message Board
#1 Resource for Ford Explorer and Ranger Owners - By Enthusiasts, for Enthusiasts.


Ford Explorer Generation Guide

EF Swag Store 2016 Ford Explorer Forums Elite Membership Chat Room My Posts Reviews Explorer Photo Gallery
Go Back   Ford Explorer and Ranger Forums "Serious Explorations" > Ford Explorer Ranger Repair - Troubleshooting - Modifications & Detailing Forums > Under the Hood

Notices

Under the Hood Ford Explorer and Ranger, Engine, troubleshooting, modifications, performance and accessories.

How to check your fuel pressure

Reply
 
Thread Tools
Old 11-08-2006, 10:43 PM   #1
KaiserM715
Houston, Texas
'10 Ford Raptor
 
Join Date: Oct 2005
Posts: 179

Vehicle Specs

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
(Original Poster)
How to check your fuel pressure

I needed to check my fuel pressure to help chase down possible causes for a trouble code that I had. I borrowed a fuel pressure gauge kit from a co-worker, but I have seen them new for $35 to $45 at the auto parts store.

Here is the one that I used:


The clear hose is connected to a relief valve to relieve the pressure in the line after testing. The brass connector on the end of the black hose connects to the fuel rail. For Fords, the small adapter shown is needed as the Schrader valve on the Ford fuel rail is smaller than other makes.

Based on advice from the Haynes manual, I disconnected the fuel pump relay (or the inertia relay), located below the glove box in the passenger foot well area. The grey connector was disconnected.


Then I cranked the engine over for 10-15 seconds to relieve the pressure. After the pressure is relieved, I removed the bright blue dust cap from the valve on the fuel rail. The valve is located in between the oil filler neck and the intake manifold and in front of the coil pack.


I threaded the adapter on first and tightened it until it was snug with a wrench. Then I threaded the gauge on to the adapter.


I reconnected the fuel pump relay and turn the key on, but I did not start the engine. The fuel pressure read to be about 62 psi (the acceptable range is from 56 psi to 72 psi).


Then I started the engine and read the pressure to be about 66 psi.


After I shut the engine off, I depressurized the line by depressing the black button on the relief valve. I placed the clear hose in a bucket beforehand to catch the gasoline. The pressure needs to be bled down to zero to safely disconnect the gauge.


I stuffed a shop towel under the fuel rail fitting to soak up any gasoline that leaked out when I disconnected the gauge and the adapter. I replaced the dust cap and that was it!!

Note: My vehicle is a '00 Ranger with the 4.0 OHV engine, so your fuel pressure specs and fuel rail valve location may differ.




__________________
Bring an old thread back to life, use search!!
'10 SVT Raptor
'67 KaiserM715
Join the BlueRibbon Coalition . . . it's YOUR Public Land!
KaiserM715 is offline   Reply With Quote
( Join the Elite Explorers )

Join the Elite Explorers for only $20 a year. Explorer Forum has probably saved you that much already, and will continue to save you money as you learn how to diagnose and fix problems yourself, and learn which modifications really work without having to experiment on your own. Elite Explorer members can change the forum "styles" to eliminate most ads, including blue underlined links, and no ads on photos. Other benefits include the ability to store 1000 Private Messages, upload photo attachments directly to your posts and to our Photo Gallery and more. Join the Elite Explorers today.


Old 07-17-2008, 11:14 PM   #2
Dylansav
Twin Cities,Minnesota
'98 XLT
 
Join Date: Feb 2008
Posts: 141

Vehicle Specs

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)


Nice write-up! I've been wondering how the process of checking your own fuel pressure goes about. I'm going to give it a shot.
Dylansav is offline   Reply With Quote
Old 07-17-2008, 11:24 PM   #3
Blacksheep Josh
Slinky+Escalator=Fun
Statesboro, GA
 
Blacksheep Josh's Avatar
1993 Ford Explorer XLT
 
Join Date: Jul 2006
Posts: 3,585

Vehicle Specs

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 6 Post(s)
I wonder how many pages a "Ford Explorer Write-Up" would be.

This, like many on this sight, are a lot better then the ones even done professionally in the Haynes and Chilton's. I also like that someone actually NEEDED to do it, and didn't do it just to do. Shows it (whatever writeup) actually worked and fixed the problem.

Was that with stock fuel pump? Sometime I feel as if my '93 Explorer fuel pump isn't working right some days...




__________________
I haven't been on this forum in a while and I'm trying to work my way back into it. I'm going for Mod or bust!
"Thunder" Registry R.I.P. 2005-2012
2001 Ford Ranger Edge SLAMMED)
1991 Nissan 240sx Drift Pig
"You can hear me when I'm coming" - Yung Joc
Blacksheep Josh is offline   Reply With Quote
Old 07-17-2008, 11:28 PM   #4
Maniak
Moderator-Stock 91-94
Vail, Arizona
 
Maniak's Avatar
1992 XLT 4x4
 
Join Date: Feb 1999
Posts: 11,707

Vehicle Specs

Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 133 Post(s)
Quote:
Originally Posted by blacksheep josh View Post

Was that with stock fuel pump? Sometime I feel as if my '93 Explorer fuel pump isn't working right some days...
It looks like he was testing on a 2000 which runs higher pressure than the 1st gens...

~Mark




__________________
Click HERE to see our Explorer Specs
Maniak is offline   Reply With Quote
Old 07-20-2008, 11:17 PM   #5
KaiserM715
Houston, Texas
'10 Ford Raptor
 
Join Date: Oct 2005
Posts: 179

Vehicle Specs

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
(Original Poster)
Talk about bringing a thread back from the dead!! That is what I like to see!!

Quote:
Originally Posted by blacksheep josh View Post
Was that with stock fuel pump?
Yes, it is the stock, original pump.

Quote:
Originally Posted by Maniak View Post
It looks like he was testing on a 2000 which runs higher pressure than the 1st gens...
Yep, a 2000 Ranger with the 4.0L OHV.




__________________
Bring an old thread back to life, use search!!
'10 SVT Raptor
'67 KaiserM715
Join the BlueRibbon Coalition . . . it's YOUR Public Land!
KaiserM715 is offline   Reply With Quote
Old 04-15-2009, 11:51 PM   #6
javiscancino
SAN YSIDRIO
 
javiscancino's Avatar
92 FORD EXPLORER
 
Join Date: May 2006
Posts: 34

Vehicle Specs

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
i did a swap from a 92 4.0 ohv to 98 4.0 sohc engine,. we are using the same fuel pump the fuel pump is from a 2.9 engine, external fuel pump,. this sohc engine the ecu was reprogrammed for better performance, it worked awsome from 3000 rpms to 6500, the problem was from idle to 3000 rpms, well, i just checked the fuel pressure and at idle with the fuel pressure regulator connected was 30psi and 40psi disconnected, so, at 40psi the engine rev great from idle, that was the problem, very low pressure,

my question is, what should be the ideal working fuel pressure for a 98 sohc engine,. it comes with a fuel pressure regulator and plastic rail,. as a matter of fact, that engine was returnless fuel rail, we put another fuel rail with the return line,.
javiscancino is offline   Reply With Quote
Old 03-29-2011, 10:55 PM   #7
BlackedOut
Crestline, CA
1997 Mountaineer
 
Join Date: Nov 2010
Posts: 194

Vehicle Specs

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks for this one. Ive been wanting to check mine.




__________________
Wanted: Brush guard and light bar for 97 Mercury Mountaineer

My Mugshot http://www.explorerforum.com/forums/...52#post2692652
BlackedOut is offline   Reply With Quote
Old 04-21-2011, 10:25 AM   #8
MrShorty
Spanish Fork, UT
92 XLT and '87 Bronco II
 
Join Date: Dec 2001
Posts: 5,006

Vehicle Specs

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
Quote:
Originally Posted by Maniak View Post
It looks like he was testing on a 2000 which runs higher pressure than the 1st gens...

~Mark
For future reference, here's a thread with the fuel pressure testing specifically applied to the older "continuously circulating" fuel system used on the 1st gens. http://www.explorerforum.com/forums/...d.php?t=142801

It might be nice for future users if a moderator or someone could edit the titles of the two threads to make it apparent which thread applies to the newer "returnless" system and which thread applies to the older version.




__________________
Mr. Shorty
92 XLT 4x4
87 Bronco II XLT 4x4
'98 Chev K1500 Suburban SLT 4x4
MrShorty is offline   Reply With Quote
Old 04-21-2011, 10:46 AM   #9
Maniak
Moderator-Stock 91-94
Vail, Arizona
 
Maniak's Avatar
1992 XLT 4x4
 
Join Date: Feb 1999
Posts: 11,707

Vehicle Specs

Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 133 Post(s)
If you can give me the ranges that should be in the title of the two threads (years etc) I can modify them, then pull out this conversation and make sure they are in the useful thread forum too.

~Mark




__________________
Click HERE to see our Explorer Specs
Maniak is offline   Reply With Quote
Old 04-21-2011, 05:50 PM   #10
MrShorty
Spanish Fork, UT
92 XLT and '87 Bronco II
 
Join Date: Dec 2001
Posts: 5,006

Vehicle Specs

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
I wish I could give you definite year ranges, but I'm just not sure. I know up through ~'96 is definitely continuous circulation at 40 psi. From the information presented here, '00 4.0 is returnless/60+ psi. Part of me wants to say '98, but I really don't know what year Ford changed fuel system design, or if it makes a difference which engine (OHV or SOHC or 5.0). Hopefully somebody else can give a more definite idea of which year/engine introduced the returnless system.




__________________
Mr. Shorty
92 XLT 4x4
87 Bronco II XLT 4x4
'98 Chev K1500 Suburban SLT 4x4
MrShorty is offline   Reply With Quote
Old 05-08-2011, 09:17 PM   #11
ranger7ltr
Elite Explorer
Great State of Texas
1999 Sport
 
Join Date: Nov 2001
Posts: 1,154

Vehicle Specs

Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 6 Post(s)
1999 was the first year of the returnless fuel system...

Quote:
Originally Posted by MrShorty View Post
I wish I could give you definite year ranges, but I'm just not sure. I know up through ~'96 is definitely continuous circulation at 40 psi. From the information presented here, '00 4.0 is returnless/60+ psi. Part of me wants to say '98, but I really don't know what year Ford changed fuel system design, or if it makes a difference which engine (OHV or SOHC or 5.0). Hopefully somebody else can give a more definite idea of which year/engine introduced the returnless system.
And the operating pressures were 65-72 psi nominal...Plus there is not a vacuum operated fuel pressure regulator on the fuel rail either...The fpr is in the tank mounted on the fuel sending unit/pump mount and the device on the fuel rail is a fuel damper...And it did not matter what engine was in the truck...

The fuel damper is there to even out the pulses of the injector opening and closing...

Oh and the fuel pump runs constantly; it DOES NOT vary speed or pressure as the later pwm pump does...




__________________
When in doubt, use a bigger hammer!

2014 Jeep Compass Limited [Company Vehicle]
2003 Ford F-150 XLT Supercab
1999 Ford Explorer Sport [new playtoy]
1983 Ford Ranger V8 [soon to be gone]
ranger7ltr is offline   Reply With Quote
Old 05-08-2011, 11:44 PM   #12
MrShorty
Spanish Fork, UT
92 XLT and '87 Bronco II
 
Join Date: Dec 2001
Posts: 5,006

Vehicle Specs

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
Thanks for that. That's the kind of information we're trying to pin down.




__________________
Mr. Shorty
92 XLT 4x4
87 Bronco II XLT 4x4
'98 Chev K1500 Suburban SLT 4x4
MrShorty is offline   Reply With Quote
Old 11-18-2011, 05:35 PM   #13
Phreaq
Fresno CA
2k TJ, '92 XJ, 1970 F100
 
Join Date: Dec 2007
Posts: 22

Vehicle Specs

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I'm getting mixed information about fuel pressure ...
I am working on a 2001 Explorer Sport-Trac 4.0 soch
The Pressure tester manual (actron) stated 35-60psi for all 2001 explorers.
Is there that much difference in the 2000 and 2001?
Phreaq is offline   Reply With Quote
Old 11-19-2011, 04:45 PM   #14
Phreaq
Fresno CA
2k TJ, '92 XJ, 1970 F100
 
Join Date: Dec 2007
Posts: 22

Vehicle Specs

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Post Fuel Pressure for 2000 model year

Quote:
Originally Posted by ranger7ltr View Post
Quote:
Originally Posted by MrShorty View Post
I wish I could give you definite year ranges, but I'm just not sure. I know up through ~'96 is definitely continuous circulation at 40 psi. From the information presented here, '00 4.0 is returnless/60+ psi. Part of me wants to say '98, but I really don't know what year Ford changed fuel system design, or if it makes a difference which engine (OHV or SOHC or 5.0). Hopefully somebody else can give a more definite idea of which year/engine introduced the returnless system.
And the operating pressures were 65-72 psi nominal...Plus there is not a vacuum operated fuel pressure regulator on the fuel rail either...The fpr is in the tank mounted on the fuel sending unit/pump mount and the device on the fuel rail is a fuel damper...And it did not matter what engine was in the truck...

The fuel damper is there to even out the pulses of the injector opening and closing...

Oh and the fuel pump runs constantly; it DOES NOT vary speed or pressure as the later pwm pump does...
2000* Ford Explorer Fuel pump specs
Quote:
Originally Posted by Alldata
4.0 OHV Ranger/Explorer F87E-H1A Gray 14lbs/hr MRFS 55-65psi
4.0 OHV Ranger/Explorer FFV F87E-E1B Turq 14.5lbs/hr MRFS 55-65psi
4.0 SOHC Explorer/Mountaineer XL2E-A1C Yellow 19lbs/hr MRFS 55-65psi
4.0 SOHC Explorer USPS 1L2E-A5A Black 27lbs/hr MRFS 55-65psi
5.0 Explorer FFV XL2E-B5A Green 19lbs/hr MRFS 55-65psi
Key
Engine, Model, Part# (9F593), Connector color, Flow rate, Fuel system (Mechanical Returnless Fuel System), Pressure

*These specs are for the 2000 model year I did not look up 99 (sorry) and 2001 spec are not the same across all motors.
Phreaq is offline   Reply With Quote
Old 11-30-2011, 02:19 PM   #15
k1k1to
florida
1997 XLT
 
Join Date: Nov 2011
Posts: 2

Vehicle Specs

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
nice
k1k1to is offline   Reply With Quote
Old 01-29-2012, 12:25 PM   #16
ihatefords
Spring City, PA.
'96 Exploder
 
Join Date: Jan 2012
Posts: 6

Vehicle Specs

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Exclamation Another of my bad ideas, or is it doable?

I've been dealing with a ton of problems with my 96 Exploder, now I'm down to checking the fuel delivery components. I ordered a pressure tester, so I'm waiting for that to get here... I'm a big fan of SEAFOAM...but on injected engines, you have to dump it in the tank, and it becomes very diluted. Is it possible to maybe pull the pump fuse to relieve the pressure, modify a Schroeder valve attachment, and pump the foam directly into the rail? I know it's risky to be playing with modified valves on fuel under pressure, but I don't see any other way to use the foam instead of the fuel additive...and I really want to give a high concentration to the injectors...
ihatefords is offline   Reply With Quote
Old 02-21-2012, 10:18 PM   #17
glockman
Utah
1998 Sport
 
Join Date: Jul 2011
Posts: 22

Vehicle Specs

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Easier way to seafoam would be to pull one of the vacuum line, ie the one to the brake booster and stick it in the bottle of seafoam with the engine running. It will suck it into the intake. I don't personally use seafoam but have seen it done this way.
glockman is offline   Reply With Quote
Old 10-20-2012, 03:37 PM   #18
keleko17
Louisville, KY
2007 EB and 1999 XLT
 
Join Date: Jun 2009
Posts: 65

Vehicle Specs

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
I am sure I am an idiot, but I am once again bringing this thread to life.

I have a 99 Explorer, OHV, looking for fuel pressure specs. I have tried searching, and keep coming up pretty empty, or confused. I got the loan-a-tool from Autozone to do this test. I have a few specific questions...

1. What pressure should I have with when I turn the key to an on position?
2. What pressure should I have running at idle?
3. What about while under load? (Saw a Youtube video of a guy actually driving to test, I think I will just throttle up)
4. How long should it keep pressure after turning off the engine?
5. Can I test anywhere beside the fuel rail? Such as before the fuel filter and after, to see if the filter is a possible problem.
keleko17 is offline   Reply With Quote
Old 01-20-2014, 08:49 PM   #19
1cowboy
2001 ford sport trac
 
Join Date: Jan 2014
Posts: 1

Vehicle Specs

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
fuel pump 2001 ford 4.0 sport trac

is there a fuse or relay for the fuel pump?? i disconnected fuel line at filter under drivers side floor cranked over no fuel came out? should have right??
1cowboy is offline   Reply With Quote
Reply


Suggest this thread to friends:



Join the "Elite Explorers" Today!



Search Explorer Forum


Top of Page

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 06:20 AM.



US Flag
We Support Our Troops!

Explore the site!


Copyright 2014 - 1996 Rick Horwitz Photography



Ford Motor Company is not involved in the management of this site in any way.



All tips on this site are for use at your own risk and discretion.

Modifying the suspension on any vehicle will cause changes to its handling characteristics.



Vendor Tools vBulletin Plugins by Drive Thru Online, Inc.