fuel delivery problems
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New User
Joined: Aug 2003
Posts: 1
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fuel delivery problems
I have 95 4.9 I-6. dual tanks. The problem is the back tank is working fine. The front is not working, when I switch from the back to the front it stalls out like no fuel is getting to the engine. What could the problem be? There are no kinked lines running from the front tank. The fuel filter is fine with the back tank working properly right? What else to check for?
Thanks in advance..
Thanks in advance..
Last edited by Ford_Six; Aug 31, 2003 at 12:37 AM.
Hotshot
Joined: Oct 2002
Posts: 18,488
Likes: 22
From: The Big, Oregon
fuel delivery problems
Welcome to FTE!
Your problem is most likely the switching valve, but you would probably be better off asking this question in the 87-96 forum. Please turn on the e-mail option in your profile so you can be notified of any changes.
Your problem is most likely the switching valve, but you would probably be better off asking this question in the 87-96 forum. Please turn on the e-mail option in your profile so you can be notified of any changes.
New User
Joined: Aug 2003
Posts: 21
Likes: 0
From: Jacksonville, NC
fuel delivery problems
I don't know about on the 4.6L motor, but on the 302, I have a fuel pump cutoff switch. If your truck is similarly equipped, try tripping that switch and see if that doesn't reset it.
Also, when you flip the ignition to run (before starting) you should hear a slight hum from the fuel tank for about 2 seconds (the pump priming the fuel lines to the rail so you get a quick start-up). If you don't hear this hum, or if it sounds weak or unsteady, then likely your fuel pump has gone to the big fuel tank in the sky.
Also, when you flip the ignition to run (before starting) you should hear a slight hum from the fuel tank for about 2 seconds (the pump priming the fuel lines to the rail so you get a quick start-up). If you don't hear this hum, or if it sounds weak or unsteady, then likely your fuel pump has gone to the big fuel tank in the sky.
Tuned
Joined: Dec 2002
Posts: 265
Likes: 2
From: Cleveland
fuel delivery problems
Replaced the front fuel pump on my '95 4.9 straight six within the last couple months, fairly easy if you get a friend to help you take the bed off. I got no friends, but I got a hoist 
One test is fuel pressure at the injectors. Had a mechanic check it for me, my back tank was ok, but front tank was all over the map. Don't know how those results would compare with symptoms of a bad selector valve, tho. All I know is the new pump solved my problem.
One test is fuel pressure at the injectors. Had a mechanic check it for me, my back tank was ok, but front tank was all over the map. Don't know how those results would compare with symptoms of a bad selector valve, tho. All I know is the new pump solved my problem.
New User
Joined: Sep 2003
Posts: 1
Likes: 0
fuel delivery problems
I have exact same problem. Same make & model.
This has been going on for 6 months, now when driving on front tank gas is filling back tank. When I drive 1 hour, I fill back tank 1/5.
How did you fix your problem. Also, I can't find the valve, I searched under the truck for 45 minutes. Where is it ?
Need help !
Thanks
This has been going on for 6 months, now when driving on front tank gas is filling back tank. When I drive 1 hour, I fill back tank 1/5.
How did you fix your problem. Also, I can't find the valve, I searched under the truck for 45 minutes. Where is it ?
Need help !
Thanks
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Tuned
Joined: Dec 2002
Posts: 265
Likes: 2
From: Cleveland
fuel delivery problems
The problem on my truck seems to have been solved by a new fuel pump. I don't know anything about the selector valve option, I believe it was a problem on early '90's dual tanks. Anyone else have information on that? My Haynes "cookbook" says the valve is mounted along the left frame rail and has a page or two of tests to perform. The filling from the tank with the remaining good pump to the tank with the bad pump was one of my symptoms too.
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New User
Joined: Sep 2003
Posts: 17
Likes: 0
fuel delivery problems
My '89 F150 is doing something similar. I know it's not a selector valve problem on my truck because it will run for at least a few minutes after I switch the tanks. I was told by a mechanic that this is a symptom of a worn out internal tank pump. Worn bearings in the pump cause it to lose pressure after running for a while. My current fix is to stay on the back tank and vist the station twice as often. Though if one pump went out after 13 years of service then maybe I better get on it...
Senior User
Joined: Sep 2002
Posts: 167
Likes: 0
From: Alberta
fuel delivery problems
All of these problems are indicitive of a faulty fuel pump. These trucks have had numerous problems with failing pumps. Symtoms include either complete or intermittened failure of the pump (causing the truck to sputter/stall), or filling of one tank by another (caused by failure of the internal check valve in the pump). My pump in particular only seemed to fail during extremely hot weather or during long distance highway travel. Replacement of my front fuel pump has fixed this problem. Do a search on this forum and you'll see many people have had the same problems as you; and give you tips on replacing the pump.