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 > 1991 - 1994 Explorer Ranger Navajo 1st Generation > Stock 1991 - 1994 Explorers

Notices

Stock 1991 - 1994 Explorers For questions related to the base Ford Explorer. Problem solving, maintenance, TSB, service bulletins, owner reviews, specifications. No modification questions.

Fuel Pump has no power

Reply
 
Thread Tools
Old 12-11-2010, 05:14 PM   #1
dreamin-on
 
Join Date: Dec 2010
Posts: 6

Vehicle Specs

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
(Original Poster)
Fuel Pump has no power

I have searched and read all of the fuel pump threads and am still at a dead end. Please help.

1992 Explorer Sport 4X4 manual transmission will not start. This vehicle had been parked for a year and previously was a daily driver. The motor turns over just fine but I noticed when you take the key to "on" the fuel pump does not run to prime the engine. I have done the following:

-New battery
-Checked for voltage at the fuel pump connector just above the rear axle. 7 volts. I'm not getting power to the fuel pump.
-New fuel pump relay
-New EEC relay
-Checked for voltage at the inertia switch. 6 volts or so--not 12
-Verified the "check engine" light comes on, indicating to me the PCM is fine.
-Attempted to short the fuel pump relay. Nothing.
-Verified 12V at the fuel pump relay and EEC relay.
-Jumped the inertia switch by disconnecting the plug and inserting a jumper wire.

I should have this beast running by now. Please help.
dreamin-on is offline   Reply With Quote
( Join the Elite Explorers )

For only $20 per year you can become an Elite Explorer member. 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 12-11-2010, 08:03 PM   #2
James909
Long Island, NY
1994 GMC Yukon 2 Door
 
Join Date: Jan 2008
Posts: 683

Vehicle Specs

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Welcome to the forum. With the ignition on try grounding the light blue/orange wire in the self-test connector. If the fuel pump turns on then the fuel pump circuit is fine, but the PCM is not triggering the fuel pump relay.




__________________
-James
1992 Ford Explorer XLT 4x4 - Sold
1994 GMC Yukon 2 Door
350 TBI
James909 is offline   Reply With Quote
Old 12-12-2010, 11:58 AM   #3
dreamin-on
 
Join Date: Dec 2010
Posts: 6

Vehicle Specs

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
(Original Poster)
Thanks, I'll give that a try tomorrow. Rainy day today.
dreamin-on is offline   Reply With Quote
Old 12-12-2010, 12:07 PM   #4
stanleycr1
Elite Explorer
Ivor,VA
93 XLT,93 SPORT,92 SPORT
 
Join Date: Jun 2008
Posts: 17

Vehicle Specs

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
I would hang test a new pump assembly if possible to see if it runs when you turn on the key. The fuel gage wires run thru that same plug so there is always power on one pin. NOTE: If you are short on money go ahead an drop the tank before you buy a new pump. There is a good chance that one of the wires have corroded inside the tank an broke off at the terminal. I have seen that twice.
stanleycr1 is offline   Reply With Quote
Old 12-26-2010, 06:00 PM   #5
dreamin-on
 
Join Date: Dec 2010
Posts: 6

Vehicle Specs

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
(Original Poster)
Thank all of you for the recent help. I have not had much time to work on this rig lately but did get out there the other day. I grounded the light blue/orange wire in the self-test connector and the fuel pump did not run. While I had the wire connected I went ahead and checked for voltage at the fuel pump connector above the rear axle and found 12V.

I am almost certain that it really is the fuel pump now. What do you think?
dreamin-on is offline   Reply With Quote
Old 12-26-2010, 09:48 PM   #6
DeRocha
NEX Vice President
Brockton, MA
 
DeRocha's Avatar
'93 XLT 4x4
 
Join Date: Jul 2003
Posts: 6,664

Vehicle Specs

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Quote:
Originally Posted by dreamin-on View Post
Thank all of you for the recent help. I have not had much time to work on this rig lately but did get out there the other day. I grounded the light blue/orange wire in the self-test connector and the fuel pump did not run. While I had the wire connected I went ahead and checked for voltage at the fuel pump connector above the rear axle and found 12V.

I am almost certain that it really is the fuel pump now. What do you think?
The fuel pump is feed directly from the inertia switch.. If the switch is reading ~6V then the wire you are testing is not the pump wire.

Quote:
The fuel circuit will only register 12v while the engine is cranking.. Once the tach wire goes to Zero RPMs the fuel circuit will drop to 6-7v (which will not run the fuel pump). I would run a hot wire from the battery to either terminal on the inertia switch to confirm the fuel pump runs and/or starts the vehicle. One member ran his X like that for months before tracking the problem down to a loose ground wire in the EEC.




__________________
John D-"Search first, Ask questions later" & "You can have my Explorer when you pry the keys from my cold dead hands." <<<Forum Rules >>>*My Truck*
4x4 Trouble Shooting Guide
See how cars work Axle and tire calculators U-joint replacement info/pics
Repair info NEX-New England Explorers NEX: Club Events
DeRocha is offline   Reply With Quote
Old 12-26-2010, 11:23 PM   #7
MrShorty
Spanish Fork, UT
92 XLT and '87 Bronco II
 
Join Date: Dec 2001
Posts: 5,004

Vehicle Specs

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Quote:
Originally Posted by dreamin-on View Post
Thank all of you for the recent help. I have not had much time to work on this rig lately but did get out there the other day. I grounded the light blue/orange wire in the self-test connector and the fuel pump did not run. While I had the wire connected I went ahead and checked for voltage at the fuel pump connector above the rear axle and found 12V.

I am almost certain that it really is the fuel pump now. What do you think?
If you ground the fuel pump test lead, get 12 V at the fuel pump connector, then we can conclude that the circuit seems functional up to that point. We aren't quite at the point yet of definitely saying the pump itself is bad. We could still have a fault in between the connector and the pump, or on the ground side of the pump. At this point, I would probably check the fuel pump ground (On my '92 the fuel pump ground attaches to the body behind the radiator overflow). If the ground looks good, then I'd probably be at the point of dropping the tank.




__________________
Mr. Shorty
92 XLT 4x4
87 Bronco II XLT 4x4
'98 Chev K1500 Suburban SLT 4x4
MrShorty is offline   Reply With Quote
Old 12-29-2010, 09:58 AM   #8
marragtop
balt, md
91 xlt, 92 xlt, 95 xlt
 
Join Date: Apr 2001
Posts: 2,072

Vehicle Specs

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
You should get 12v on both sides of the inertia switch. If you don't, then the problem is either the inertia switch or in front of it (PCM relay, FP relay, .etc).




__________________
'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 01-15-2011, 04:04 PM   #9
dreamin-on
 
Join Date: Dec 2010
Posts: 6

Vehicle Specs

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
(Original Poster)
Today I hung a new fuel pump from the connector above the rear axle. Turned the ignition to "on" and the pump ran like a champ so I dropped the tank and replaced the old one. She fired right up except the starter did not disengage. That's my project for tomorrow. The fuel pump was essentially stuck from sludge in the tank, it was essentially tar.

Thank all of you for your help.

I'll replace the starter tomorrow and she how she runs.

Picture of old pump:

dreamin-on is offline   Reply With Quote
Old 01-15-2011, 05:04 PM   #10
CountryBoy78
Rice Lake, WI
94 Limited 4.0L 4x4
 
Join Date: Apr 2009
Posts: 88

Vehicle Specs

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I think you got your money's worth out of that fuel pump........must have been sitting for some time to get that rusty ....wow.....
CountryBoy78 is offline   Reply With Quote
Old 01-15-2011, 05:45 PM   #11
WickedWindsor
Ontario, Canada
351 powered, 1991 XLT 4x4
 
Join Date: Mar 2005
Posts: 245

Vehicle Specs

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
You may want to change the oil before firing it up if it's been sittng a while. Old stale grimey oil can really mess up an otherwise good engine.




__________________
'91 XLT 4DR 4X4
351 EFI Windsor, 4R70W, Baumann electronic controller
Dana 44 SAS Done!, 2" PA Body Lift GONE, SOA, 33"x12.5x15 Pro Comp Mud Terrains. 410 Gears, BW1356 manual transfer case. Homebuilt Custom Exhaust with Flowmaster Super 40 Series.
WickedWindsor is offline   Reply With Quote
Old 01-15-2011, 08:32 PM   #12
dreamin-on
 
Join Date: Dec 2010
Posts: 6

Vehicle Specs

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
(Original Poster)
Oil already changed. Will change again once it's been running a few min.
dreamin-on is offline   Reply With Quote
Old 01-15-2011, 08:41 PM   #13
stanleycr1
Elite Explorer
Ivor,VA
93 XLT,93 SPORT,92 SPORT
 
Join Date: Jun 2008
Posts: 17

Vehicle Specs

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Glad you got it going. Don't forget the Fuel Filter.
stanleycr1 is offline   Reply With Quote
Old 01-17-2011, 08:04 PM   #14
dreamin-on
 
Join Date: Dec 2010
Posts: 6

Vehicle Specs

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
(Original Poster)
Starter replaced. Drove it about 10 miles today and it runs great. Now on to the next project, brakes.
dreamin-on 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 11:09 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.