Hello People,I would like some advice,I am stumped.My 94 f250 4x4 xlt 7.5 with a e4od,extra cab,started a new thing ,at a stop light or where you sit for a minute or two will SOMETIME shut off just like you turned the key,put in park starts right up get a slight smell of gas.this has happened 4 times in the last week,next,I can go where it will be off for 5 to 10 minutes and it starts hard,turnes over for about 5 seconds it usuale starts right up,and get a smell of gas then put it in drive and the motor starts to buck and misfire put back into park smoothes out and runs fine,this has happened twice,other wise runs great.I have checked,tank vents,elec. grounds,plugs checked for corroded conn.,you can hear both fuel pumps..I am hopeing some help.Thank you

 

Does either fuel pump run continuously when you turn on the key and before you start it? If not, time to run codes.

 

they build up pressure and shut off,checked codes,it has not thrown any,codes checked with computer at garage

 

Starting with codes and fuel pressure is proven good practice.

Sounds like a lot of threads we have had here. It seems like they are more common as time goes on and these trucks get older and more parts are trying to work past their design life.

The stalling issue has been often fixed by a new PIP in the distributor. Heat is often a factor. The shutter wheel that triggers the PIP is sometimes a problem too. The shutter wheel gets stuff built up on it that interferes with the electrical/magnetic fields, can be cleaned or replaced. I would proceed by cleaning up all your battery cable connections and grounds. Do the connections on your starter relay too. Wiggle test the fusible links coming off your starter relay.

The coil and ignition module are getting old too. There are some great threads here on these subjects. I'll post them later if I find them.

 

Pull the vacuum hose off the Fuel Pressure Regulator (FPR) and turn on the key with a cold engine.
The selected pump will only run for one second.
Does fuel come out of the nipple on top of the FPR?
If yes replace the FPR.
If the pump runs for more than a second or two you may have a bad PCM or its wiring.

 

checked the fpr,everything seams fine,checked both pumps,start and stop about 2 seconds,no gas from vacume port.distrubitor is fine,clean wheel and pick up,rest of system is new,cap,rotor,wires,plugs and coil,,all accel parts.this is somewhat d a pissha

 

Got a vacuum pump? You could pull a vacuum on the FPR and see if it holds.

 

I will do that.I have to leave for a week,I will give a report when I get back.Tanks to all of you for your imput.Have a save and good week.

 

Hi, to let the people know what happened with my truck,I drove 150 miles to camp,unloaded went to store,came out to start up,was very hard to start but did,a hour later no start at all,got a new FPR at the ford dealer,gave me half off for the age,last one he had and will get,installed ran great for 2 days,dead,cranked over strong smell of gas at tail pipes,pulled a couple of plugs gas wet.checked no spark,checked coil,dead,installed new coil,the old girl runs like a bat out of hell,what a difference,certain little quirkes went away and the engine runs a little quitter.THANK YOU guys for the info you shared with me,may the foord gods look after your trucks