Where is my ECU computer chip located?
Asked by Randy Apr 26, 2018 at 10:29 PM about the 1996 Ford F-150 XLT 4WD Extended Cab SB
Question type: Maintenance & Repair
I have a 96 truck with dual tank system. I am having a HUGE problem with
getting fuel pressue to the motor from the back tank AND the system is also
allowing gas to go to the back tank from the front ( somehow). After replacing
my ECU and series gas relay, along with fuse, I am still getting back -suck.
Plus my check light keeps coming on when I go to back tank ( probably lack
of gas pressure to interrupt the proper pressure to block. I am trying to avoid
dropping the tank to replace the pump. I need to find the computer please
help.
6 Answers
I doubt the ECU controls the gas tanks. Probably a problem with the selector valve or a check valve.
Hello FOR, I've seen you on here a few times. I took the dash off a couple of weeks ago to get to the tank selector switch. I took 3 switches I got at junk yard and the exact stubborn attitude resulted. Friend of mine and I determined it had nothing to do with the tank select switch((.
Why wouldn't the ECU control the gas tanks?? In a recent experiment, I discovered that when you pull the relay, the motor stops. When I pull the fuel relay, again, it stops. That would be telling me that the ECU does have some sort of control of the tanks at the computer, wouldn't it??
The tank system is not that complicated. I tried to find a good diagram of the system to give you but could not. A repair manual is probably the best place to find one. The relay sends power to the pump so of course the pump stops when you pull it.
that's easy for you to say that it is not complicated. I have actually been trying to solve this mystery now for about a year and half. there are some financial decisions that were made along the way, too!! I have looked ALL over youtube and google for a solution and have come up with nothing, as well. I had it in the shop about 2 months ago. a shop that told me they could fix in a matter of hours ( while at work). After a few hours of actually being confused they went ahead and opted out of the job, and did not charge me a thing.
I actually had a mechanic tell me that it would be better to put it back in the shop to replace the pump in the back tank instead of saying to me it would be better if I considered my relays and fuses or even my E C U. The E C U is the last thing that I have to trouble shoot before knowing that I might have a bad pump or sending unit on the hangar in the tank
