Hey rmolina:

What did you finally figure out about your vehicle? I am currently experiencing the same problem with a '91 and I understand (accorinding to Chilton's Manual), that when the key is just in the "On" position that you should hear a fuel pump only momentarily. I know that mine would pump intermittently (until this morning when the pump stays on and pumping without shutting off)... and now it will not start. Yesterday and for a couple of days before, it was hard starting and seemed to misfire between 1,000 and 2,000 rpms (fuel starved?). Then after 10 to 15 minutes running, it stopped missing and ran fine. NOW, this morning it will not start.

Plenty of fuel pressure to the injector rail, but now acts as if no fuel is reaching the cylinders for ignition. I think it's a pressure sensor / regulator or "control" issue. Anyone care to weigh in on this?

[quote]ORIGINAL: rmolina41

I have a 1990 Ford F-150 XLT, 5.8L, Automatic with 107k miles on it.

My truck at times has problems starting.

I can leave the key in the RUN position (just short of the cranking position) and hear (what I think are) the fuel pumps (it's a dual tank) buzzing. As long as there is a buzz sounding, the truck will crank nicely (strong battery) but never start. It can sit and buzz for anything from 2-3 seconds to what seems like half-an-hour. Sometimes it will stop buzzing, sometimes I give up because it has simply taken too long. It seems to affect both tanks equally.

If I try cranking the engine after the buzzing has stopped, Voila! the engine starts right up.

It's almost like it loses fuel pressure or something. The weird part is that this does not always happen, it may be temperature related, I tend to think it happens more often when it is warmer, but not absolutely sure. But I have had times when it will not start after sitting for an hour, others when it will start when sitting for two or three weeks. Not exactly what I would expect from a fuel pressure leak.


I have new fuel pumps.

TIA

 

Hey guys good luck i have a 1987 f-350 that would act as if it was running out of gas with both tanks full and min is a 460 with carburetor i installed new fuel pumps in both tanks that didn't help so i replaced switching valve that didn't help so i didn't know what else to do i pulled fuel pumps out of tanks extended pickup down as far as pumps would be got m e carter external mounted fuel pump wired it up through inertia switch and installed a canister type fuel filter between pumps and tanks and that fixed my problem after about a $100.00 bucks wish i had went to external fuel pump at beginning would have saved several hundred