Go Back   Ford Truck Enthusiasts Forums > Older, Classic & Antique Trucks > 1987 - 1996 F150 & Larger F-Series Trucks
Sign in using an external account
Register Forgot Password?


1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

Welcome to Ford-Trucks Forums!
Welcome to Ford-Trucks.com.

You are currently viewing our forums as a guest, which gives you limited access to view most discussions and access our other features. By joining our community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join the Ford-Trucks Forums community today!





 
Reply
 
LinkBack Thread Tools Search this Thread
  #1 (permalink)  
Old 10-06-2001, 10:49 PM
crandall crandall is offline
Freshman User
 
Join Date: Mar 2000
Posts: 44
crandall is starting off with a positive reputation.
1988 F150 fuel pump

Reply With Quote
  #2 (permalink)  
Old 07-26-2002, 09:33 AM
Rookie001 Rookie001 is offline
New User
 
Join Date: Jul 2002
Posts: 8
Rookie001 is starting off with a positive reputation.
1988 F150 fuel pump

I have an 88 f150 six cylinder that has been stalling lately and today it won't start. I think it may be the fuel pump. Can someone tell me where it is located? I'm hoping it's not in the gas tank.
Reply With Quote
  #3 (permalink)  
Old 07-26-2002, 10:21 AM
winfordr's Avatar
winfordr winfordr is offline
Posting Guru
 
Join Date: Jan 2001
Location: Rural Florida Panhandle
Posts: 1,112
winfordr is starting off with a positive reputation.
1988 F150 fuel pump

You have two fuel pumps, one external, and one internal.
The external one is on the driver's side frame near the front of the truck.

First, listen for the pump when you switch on the ignition.
If you hear nothing, you probably have a bad relay. Replace it and try again.

If you hear a pump run for a few seconds, you know at least one of them is working. Crawl under the truck and disconnect the wire to the external pump. Then listen for pump noise again, when you switch on the ignition. If you hear a pump, your in-tank pump is working. If not, then it or the wiring to it is bad.

If you hear the in-tank pump, then reconnect the external pump and have someone else switch the ignition while you listen from under the truck, so you can tell if both are working.

If both are working, then you may have a clogged filter, or some other problem.

Good Luck!




Winford
__________________
Winford
06 F-150 SC Lariat
06 Mariner Hybrid AWD
02 Mountaineer 4.0L AWD
88F150, 5.0 ExtCab 205K
54 F100 92 5.0 HO Powered
Reply With Quote
  #4 (permalink)  
Old 07-26-2002, 10:26 AM
F150xlt F150xlt is offline
Posting Guru
 
Join Date: Jan 2002
Location: Baltimore
Posts: 1,295
F150xlt has a very good reputation on FTE.F150xlt has a very good reputation on FTE.F150xlt has a very good reputation on FTE.
1988 F150 fuel pump

There is a pump in the gas tank and a larger pump mounted
on the inside of the driverside frame rail below the
driver side door.

When you turn the ignition to run you should hear the
frame rail pump buzz for about 2 seconds.

To check the pump inside the gas tank, disconnect the
hose going into the main pump. Turn the ignition to
run and if gas comes out of the hose the intank pump
is probably good. Use a bucket or pan to catch any
gas that comes out.

To check the main pump disconnect the hose at the main
pump outlet, attach a rubber hose to direct the gas
to the bucket and turn the ignition to run.

The hoses have a plastic clip that you pry up with
a small flat blade screwdriver. You pry the clip up
(Don't need to take it completely off). You then
pull the hose off. To reinstall the hose, push the clip
back down then push the hose back on. If you break
one of the clips, the dealer has them and I've
seen them at Pep Boys. There are two different ones
used on the fuel hoses. Black ones and White ones.




Reply With Quote
  #5 (permalink)  
Old 07-26-2002, 11:15 AM
Rookie001 Rookie001 is offline
New User
 
Join Date: Jul 2002
Posts: 8
Rookie001 is starting off with a positive reputation.
1988 F150 fuel pump

Thanks for the info guys. I'll check it out after work. Is the fuel filter located near the external pump?
Reply With Quote
  #6 (permalink)  
Old 07-26-2002, 11:45 AM
Rookie001 Rookie001 is offline
New User
 
Join Date: Jul 2002
Posts: 8
Rookie001 is starting off with a positive reputation.
1988 F150 fuel pump

Also, could it possibly be a fuse. I was reading other posts and one mentioned the fuel pump fuse was located under the hood. If this is something to check as well, is that where it is located or is it inside the truck in the fuse box?
Reply With Quote
  #7 (permalink)  
Old 07-29-2002, 03:06 PM
Rookie001 Rookie001 is offline
New User
 
Join Date: Jul 2002
Posts: 8
Rookie001 is starting off with a positive reputation.
1988 F150 fuel pump

In the first reply to my original post, it was mentioned to replace the relay if I heard nothing. I heard nothing but what is the relay, is it a switch or a fuse or something similar. If someone can tell me what and where this relay is I can try that first. Thanks

Reply With Quote
  #8 (permalink)  
Old 07-31-2002, 12:15 AM
pross pross is offline
Senior User
 
Join Date: Oct 2001
Posts: 135
pross is starting off with a positive reputation.
Post 1988 F150 fuel pump

the relay is under the hood, on the drivers side , behind the air filter box. I think there is about 3 relays, mounted in a bracket. They snap in., I think under a plastic cover. and there not very expensive. At least this is the way my '91 is. (5.0)
Reply With Quote
  #9 (permalink)  
Old 07-31-2002, 12:35 AM
MustangGT221's Avatar
MustangGT221 MustangGT221 is offline
Post Fiend
 
Join Date: Nov 2001
Location: Topsfield, MA
Posts: 14,944
MustangGT221 has a good reputation on FTE.MustangGT221 has a good reputation on FTE.MustangGT221 has a good reputation on FTE.
1988 F150 fuel pump

Wouldn't it be a good idea to check the fuel pressure too....


Primary rig is Green Thunder:
95' F-150 XLT 4x4, 302, 5 spd, MSD 6A, Flowmaster American Thunder Exhaust, Sunroof, Clear corners w/ Diamond headlights, CD player with 2 10" subs and some 32" BFG Muds .

Check out my Gallery for a look-see.


Then theres:
99' Mustang GT 4.6L
88' F-250 Superduty 4x4 351/c6
95' Mercury Cougar 4.6L V-8
80' E-350 300/6 with a
3 spd column shifter. Top speed is 65mph, Go Baby Go!

__________________
Justin
95' F-150 XLT 4x4, 393ci stroker, 5 spd, 6" lift/35s
Reply With Quote
  #10 (permalink)  
Old 07-31-2002, 11:13 PM
otter 1 otter 1 is offline
New User
 
Join Date: May 2002
Location: NE
Posts: 22
otter 1 is starting off with a positive reputation.
1988 F150 fuel pump

I have a 88 F-150 with a 351w and had the same problem just a couple weeks ago. Got to looking at the main fuel pump along the left rail and when I would wiggle the red wire I would hear the pump come on. To make a long story short I took the pump off and flattened the red spade on the wire, put it back on and haven't had any trouble since.
Reply With Quote
  #11 (permalink)  
Old 08-01-2002, 10:05 AM
Rookie001 Rookie001 is offline
New User
 
Join Date: Jul 2002
Posts: 8
Rookie001 is starting off with a positive reputation.
1988 F150 fuel pump

Well, I had the truck sitting for a couple of days and tried it last night and it started right up. I took it for a little test drive and there was no change in the way it ran for about 20 minutes. I was stopped at a light and the truck died with no sputtering and wouldn't start again. Any ideas regarding the direction to look, fuel related or electrical?
Reply With Quote
  #12 (permalink)  
Old 08-01-2002, 07:54 PM
sty_69 sty_69 is offline
Freshman User
 
Join Date: Jun 2002
Posts: 33
sty_69 is starting off with a positive reputation.
1988 F150 fuel pump

My `88 150 I6 did the same thing , guess what it was .. a loose connection at the top of the gas tank , a plug to be exact , had come loose. I pressed the plug back on , and no probs. since.
If not , at least take it to a shop you trust and have them do a scope on it.
Good luck
Peter
__________________
1988 F150 300 I6 4spd. Warner T 18 Tranny
Reply With Quote
  #13 (permalink)  
Old 08-01-2002, 11:23 PM
pross pross is offline
Senior User
 
Join Date: Oct 2001
Posts: 135
pross is starting off with a positive reputation.
Post 1988 F150 fuel pump

It has to be the pump. or one of the pumps if you have 2. Esp.if it still has the factory pumps. My '91 would go dead only at idle when it first started getting weak. (at about 70k)Mine does NOT have a pump on the frame rail. Both are inside the tanks. I'm curious about which models had a high pressure pump on the frame rail. An engineer at Walbro Engine Management , who makes the pump/module, told me that if you've run out of gas recently and kept on trying to make it run on "fumes", this will ruin a pump because gas running thru the little motor is what keeps it from overheating. As a previous poster said, have the fuel pressure checked. Doesn't take very long and won't cost much. Fuel pressure MUST be within range.
Reply With Quote
  #14 (permalink)  
Old 08-03-2002, 12:24 PM
appledarkgreen appledarkgreen is offline
New User
 
Join Date: Jul 2002
Posts: 6
appledarkgreen is starting off with a positive reputation.
1988 F150 fuel pump

I thought that I'd mention that the high pressure pump on the rail should be at 39psi, so be careful when you check it.
Reply With Quote
Old 08-03-2002, 12:24 PM
Reply

Go Back   Ford Truck Enthusiasts Forums > Older, Classic & Antique Trucks > 1987 - 1996 F150 & Larger F-Series Trucks

Tags
1988, 350, 351w, 50, 88, f150, ford, frame, fuel, fuse, high, internal, pressure, pump, pump88, truck

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 On
Trackbacks are On
Pingbacks are On
Refbacks are On
Forum Jump



All times are GMT -5. The time now is 03:38 PM.


Powered by vBulletin® Version 3.7.5
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
SEO by vBSEO 3.5.2 ©2010, Crawlability, Inc.
Advertising - Terms of Use - Privacy Statement - Jobs
This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. FordŽ is a registered trademark of the Ford Motor Company.

vbulletin Admin Backup