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Ford F-150, Truck
#1 of 194 1990 Ford f150 fuel pump relay
Jul 13, 2006 (4:46 pm)
I have a 1990 ford f150 6cyl in which i have changed the fuel filter, both fuel pumps(have duel tanks), and i am still having a fuel pumping problem. The pumps pump for a long time before shutting off. The truck will not start until they shut off. Have checked the fuel lines fuel is pumping throught the fuel filter and also into the injectors and fuel is also returning back to its proper tank. Any ideas on what to replace now?
#2 of 194 Re: 1990 Ford f150 fuel pump relay [scubarash]
Nov 03, 2006 (3:48 pm)
I am having the same trouble with my 1991 6 cyl. I have changed the fuel filter and the fuel pressure regulator -- no help. I'm beginning to think it is electrical. Have you discovered the cause yet on yor 1990?
#3 of 194 '94 F-150 Xcab with 4.9 straight 6, fuel pumps won't load
Nov 05, 2006 (9:19 am)
I have a '94 F-150, extended cab, with a 4.9Litre straight six, overdrive tranny, dual tanks, and all of a sudden when I try and start it the pumps won't run to load for starting. I have checked the fuse box under the hood on the driver side and one of the yellow 20 amp fuses blows every time I turn the key. Could this have anything to do with it not cranking? I have no clue to what the fuse controls. Plus there are four or five black, 1" square fuses in this box also that I cannot tell if they are blown or not. I really need help here as this is our work truck and "no truck-no work" which means "no work-no money".
#4 of 194 Re: '94 F-150 Xcab with 4.9 straight 6, fuel pumps won't load [jmyron]
Nov 05, 2006 (11:12 pm)
The blown fuse would have EVERYTHING to do with it not cranking. The fuse box should be labeled as to what circuit that fuse protects. If not, then your owners manual should show you. Find and repair the problem with that circuit and your vehicle should run once again.
#5 of 194 Re: 1990 Ford f150 fuel pump relay [steve1dogg]
Jan 12, 2007 (7:48 pm)
I am having the same problem with my 1992. Did you get it figured out?
#6 of 194 Re: 1990 Ford f150 fuel pump relay [hotrod_7292]
Jan 13, 2007 (8:34 am)
Yes, I did. It was the EEC.
I'd read many times that the problem is hardly ever in the engine control computer, so I kept looking elsewhere. I finally got to the point that it could possibly be the computer.
I took the computer out, opened the covers and found some burnt and disconnected leads on 2 of the components -- two capacitors actually. I bought another box from O'Reilly's, plugged it in and it started right up.
Hope I helped. Let me know
#7 of 194 was the eec bad in your situation also?
Mar 16, 2007 (8:29 pm)
what was the final solution?
#8 of 194 fuel pump
Mar 16, 2007 (8:31 pm)
what was the final solution??
#9 of 194 Re: was the eec bad in your situation also? [gedals]
Mar 17, 2007 (7:12 am)
The EEC was bad. I bought a new one, installed it, and the problem was solved.
#10 of 194 Re: fuel pump [gedals]
Mar 17, 2007 (7:13 am)
I replaced the EEC and that took care of it.