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 2015 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 > 1995 - 2001 Explorer Ranger Mountaineer - Sport thru '03 - 2nd Generation > Stock 1995 - 2001 Explorers

Notices

Stock 1995 - 2001 Explorers Questions related to non-modified 1995-2001 Explorer, Mountaineer, Ranger and '02+ Sports and Sport Trac. Problem solving, maintenance, TSB, service bulletins, owner reviews, specifications.

Fuel Pump Relay Switch Location on a 98 5.0?

Reply
 
Thread Tools
Old 10-01-2009, 08:45 PM   #1
King$nake
Oceanside, CA
1998 Eddie Bauer 5.0
 
Join Date: May 2006
Posts: 505

Vehicle Specs

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
(Original Poster)
Fuel Pump Relay Switch Location on a 98 5.0?

I DID search for this, but I was only able to find the location for the 91-94 Explorer.

Basically my issue is my fuel pump is only working sometimes. When it doesn't work, I can't start my truck at all (just turns over). However if I keep turning my key over (not starting) until I hear my fuel pump kick in, thats the only time I can start my truck. I've done some research on here, and it sounds like it's a fuel pump relay switch.

Thanks
King$nake is offline   Reply With Quote
( Join the Elite Explorers )

For only $20 per year you can become an Elite Explorer. 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 what modifications really work without having to experiment on your own. Elite Explorer members can change the forum "styles" to see less ads, no green underlined links, and many other benefits such as being able to store 1000 Private Messages, upload photo attachments directly to your posts and more. Join the Elite Explorers today.


Old 10-01-2009, 10:23 PM   #2
rwenzing
Michigan
03 Ranger FX4 LII 5.0 S/C
 
Join Date: Nov 2005
Posts: 976

Vehicle Specs

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
There is no part named "Fuel Pump Relay Switch".

Three things to look at are the PCM Power Relay, the Fuel Pump Relay and the Inertia Fuel Shut-Off Switch.

The IFSO switch is supposed to cut fuel in the event of a sharp impact (like an collision) but it can sometimes cause intermittent starting problems or stalling. It is resettable by pushing the plunger. The location is somewhere up under the dash. My 98 Wiring Manual says "near the radio" but the Ford IFSO switch is often found in the front passenger footwell above the top edge of the carpet or behind the passenger side kick panel.

The 2 relays direct power to the fuel pump among other things. They are both located in the Power Distibution Box under the hood.

Your Owner's Manual has a map of the fuses and relays in the Power Ditribution Box - look in the Roadside Emergencies section. Look up Inertia Switch in the index to find out exactly where it is.

If you don't have a paper manual, use the link in my signature to view one online. Click on Glovebox in the menu bar.




__________________
Bob
2003 Ranger FX4 Level II, 5.0L V8, 4R70W, BW4406 T/C, Aussie Locker front, Torsen rear
Torque Monsters, Magnaflow, duals; Explorer EATC, steering wheel controls, consoles
Bilstein 7100 reservoir shocks, Cadillac/Mustang SVO rear discs, Duff traction bars
CarDomain
Ford owners' manuals ONLINE, then click on "Glovebox"
rwenzing is offline   Reply With Quote
Old 10-03-2009, 03:00 PM   #3
King$nake
Oceanside, CA
1998 Eddie Bauer 5.0
 
Join Date: May 2006
Posts: 505

Vehicle Specs

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
(Original Poster)
Ok, my there are (3) different items labeled as '#9' in both my Distribution Box and Manual. Can you please confirm if the circled relay in the picture is in fact the Fuel Relay? If it IS the Fuel Relay, I tried pulling it out completely and starting my truck - didn't seem to have an effect on the Fuel Pump working or not. Haven't checked the Inertia Switch yet.





Quote:
Originally Posted by rwenzing View Post
There is no part named "Fuel Pump Relay Switch".

Three things to look at are the PCM Power Relay, the Fuel Pump Relay and the Inertia Fuel Shut-Off Switch.

The IFSO switch is supposed to cut fuel in the event of a sharp impact (like an collision) but it can sometimes cause intermittent starting problems or stalling. It is resettable by pushing the plunger. The location is somewhere up under the dash. My 98 Wiring Manual says "near the radio" but the Ford IFSO switch is often found in the front passenger footwell above the top edge of the carpet or behind the passenger side kick panel.

The 2 relays direct power to the fuel pump among other things. They are both located in the Power Distibution Box under the hood.

Your Owner's Manual has a map of the fuses and relays in the Power Ditribution Box - look in the Roadside Emergencies section. Look up Inertia Switch in the index to find out exactly where it is.

If you don't have a paper manual, use the link in my signature to view one online. Click on Glovebox in the menu bar.
King$nake is offline   Reply With Quote
Old 10-03-2009, 03:03 PM   #4
Turdle
Moderator Masterbaker
Humboldt, Kansas
 
Turdle's Avatar
2000 Mounty
 
Join Date: Jun 2003
Posts: 24,806

Vehicle Specs

Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 171 Post(s)
My 98 uses the furthest left of the 4 small ones in a row ( 4th one in from bottom right) as the fuel pump relay

Try swapping it with another. Shade tree troubleshooting yes, but effective. See if the problem moves to another circuit.
Turdle is offline   Reply With Quote
Old 10-03-2009, 03:06 PM   #5
Turdle
Moderator Masterbaker
Humboldt, Kansas
 
Turdle's Avatar
2000 Mounty
 
Join Date: Jun 2003
Posts: 24,806

Vehicle Specs

Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 171 Post(s)
http://www.explorerforum.com/forums/...ght=fuse+relay
Turdle is offline   Reply With Quote
Old 10-03-2009, 04:43 PM   #6
King$nake
Oceanside, CA
1998 Eddie Bauer 5.0
 
Join Date: May 2006
Posts: 505

Vehicle Specs

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
(Original Poster)
Quote:
Originally Posted by Turdle View Post
Awesome! Thanks for that diagram. It's for a 98 Explorer, correct? Is the PDB the same on the 4.0 as the 5.0?

Thanks again man
King$nake is offline   Reply With Quote
Old 10-03-2009, 04:56 PM   #7
King$nake
Oceanside, CA
1998 Eddie Bauer 5.0
 
Join Date: May 2006
Posts: 505

Vehicle Specs

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
(Original Poster)
Also, is there any way to determine if the Fuel Pump Relay is in fact the culprit without buying a new one? My local Kragen doesn't have one in stock, so Id have to order it. If there is any way to find out if this is the issue or not beforehand that would be great

Thanks
King$nake is offline   Reply With Quote
Old 10-03-2009, 06:42 PM   #8
King$nake
Oceanside, CA
1998 Eddie Bauer 5.0
 
Join Date: May 2006
Posts: 505

Vehicle Specs

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
(Original Poster)
Quote:
Originally Posted by King$nake View Post
Also, is there any way to determine if the Fuel Pump Relay is in fact the culprit without buying a new one? My local Kragen doesn't have one in stock, so Id have to order it. If there is any way to find out if this is the issue or not beforehand that would be great

Thanks
Well I tried taking a Relay from the Horn and using it in the Fuel Pump Relay, didn't seem to help - truck is still not starting. Can't hear the fuel pump working at all now. This really sucks. So Im guessing the Fuel Pump itself has gone bad?
King$nake is offline   Reply With Quote
Old 10-04-2009, 04:48 AM   #9
marragtop
balt, md
91 xlt, 92 xlt, 95 xlt
 
Join Date: Apr 2001
Posts: 2,074

Vehicle Specs

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
You should test the PCM power relay also. It that is bad then the fuel pump won't run. Also, don't forget about the inertia switch. Check the connector wire at the bottom of it to make sure it's on tight.




__________________
'88 F150 4x4
'91 Explorer XLT 4x4
'92 Explorer XLT 4x4
'95 Explorer XLT 4x4
If it don't = 16 (4x4), it ain't worth driving...
marragtop is offline   Reply With Quote
Old 10-04-2009, 05:50 PM   #10
King$nake
Oceanside, CA
1998 Eddie Bauer 5.0
 
Join Date: May 2006
Posts: 505

Vehicle Specs

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
(Original Poster)
Quote:
Originally Posted by marragtop View Post
You should test the PCM power relay also. It that is bad then the fuel pump won't run. Also, don't forget about the inertia switch. Check the connector wire at the bottom of it to make sure it's on tight.
Ok, so I checked the inertia switch up under the glovebox. I reset it once (pressing the red button) and for some reason my truck started 10-15x in a row after I flipped that switch - but then it started 'not starting' again. I tried hitting the switch again after that but it didn't seem to work a second time. Im still getting an inconsistent fuel pump.

Basically I have to keep turning the key over until I hear the fuel pump work, then I know if I turn it over it will start. For whatever reason Im only hearing the fuel pump come on every 5-10x tries (average).

So maybe it was coincidence that the inertia switch caused it to start working for a short amount of time?
King$nake is offline   Reply With Quote
Old 10-04-2009, 07:34 PM   #11
marragtop
balt, md
91 xlt, 92 xlt, 95 xlt
 
Join Date: Apr 2001
Posts: 2,074

Vehicle Specs

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Check the connection on the bottom of the inertia switch. While you are there, check to see if you are getting power to the inertia switch. If not, then the problem is between the ignition switch and the inertia switch, which could be the FP relay or the PCM relay.




__________________
'88 F150 4x4
'91 Explorer XLT 4x4
'92 Explorer XLT 4x4
'95 Explorer XLT 4x4
If it don't = 16 (4x4), it ain't worth driving...
marragtop is offline   Reply With Quote
Old 10-04-2009, 08:09 PM   #12
King$nake
Oceanside, CA
1998 Eddie Bauer 5.0
 
Join Date: May 2006
Posts: 505

Vehicle Specs

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
(Original Poster)
Quote:
Originally Posted by marragtop View Post
Check the connection on the bottom of the inertia switch. While you are there, check to see if you are getting power to the inertia switch. If not, then the problem is between the ignition switch and the inertia switch, which could be the FP relay or the PCM relay.
Ok, what should I look for in the inertia switch? I think I am getting power to it, because when I flip the switch up I cant start my truck at all. Atleast when its on (the switch) I can get the fuel pump to work if I turn the key enough times.

Also, if the problem is a bad fuel pump - how difficult is it to replace?

Thanks man for the help
King$nake is offline   Reply With Quote
Old 10-29-2010, 03:35 PM   #13
Harry d.
1998 ford explorer 4.0L
 
Join Date: Oct 2010
Posts: 4

Vehicle Specs

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
i have somewhat the same problem i hear my fuel pump everytime i turn the key ,but don't start reset the intertia shut off switch and it started for a few days. then started doing the same thing. can someone help me.
Harry d. is offline   Reply With Quote
Old 10-29-2010, 07:53 PM   #14
purevenom1
Angier, NC
2000 XLT
 
Join Date: Oct 2010
Posts: 36

Vehicle Specs

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Unplug the switch and see if you are getting continuity through it. You can also use a jumper wire to see if that helps or not in the place of the inertia switch. Had a Bronco II that a buddy of mine bought cause the guy couldnt figure why it wasnt starting and already replaced both fuel pumps regulator. Got it here to my house and jumped the inertia switch and he drove it home. Paid 300 for the truck due to the truck not starting. Runs fine still even to this day. Check your local junkyards for the switches and relays.
purevenom1 is offline   Reply With Quote
Old 10-30-2010, 01:13 PM   #15
Harry d.
1998 ford explorer 4.0L
 
Join Date: Oct 2010
Posts: 4

Vehicle Specs

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
check all the relays the fuel pump cut off switch everything seem to be wroking good even check corel pack. is there anything else that you can think of that would cause it not to start. thanks for your help
Harry d. 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 08:24 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.