hot start problem
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New User
Joined: Jul 2004
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hot start problem
My 351M in a '77 F250 has gone from running perfectly to dead. First problem I had was about a week and a half ago after I filled up with gas it would not restart at the gas station. Pushed her off to the side and came back later, cold, started fine. Drove to work the next day and on the way home died on a 2 to 3 shift just after coming off the fast idle, again would not restart. Waited two hours and restarted fine. Died again when I let off the gas to downshift. Would not restart hot. Waited 1 hour and restarted, drove home, died when I got home and I let off the gas (I had driven home withough letting off the gas :-)
Yesterday found and fixed a vacuum leak, thought I fixed it, ran it, she ran great, shut off, would not restart.
Today - will not start at all now. It's hot outside, 95.
Anyone got any ideas on this? Truck was running great until just recently.
(Have to admit, I posted on this a week ago thinking it was a different problem, but more info here now)
thanks
Yesterday found and fixed a vacuum leak, thought I fixed it, ran it, she ran great, shut off, would not restart.
Today - will not start at all now. It's hot outside, 95.
Anyone got any ideas on this? Truck was running great until just recently.
(Have to admit, I posted on this a week ago thinking it was a different problem, but more info here now)
thanks
Posting Legend
Joined: Sep 2001
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Your last post in fuel systems:
https://www.ford-trucks.com/forums/s...d.php?t=260112
Have you tested your ignition modules at the parts store?
https://www.ford-trucks.com/forums/s...d.php?t=260112
Have you tested your ignition modules at the parts store?
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Torque1st, yeah that's the post from a week ago I mentioned, but I don't think it's a carb problem and the turning left thing is not really what makes it quit working...
Ignition module sounds more likely - you can test them at the parts store?
Any idea why the temperature is a factor?
thanks for replying
Ignition module sounds more likely - you can test them at the parts store?
Any idea why the temperature is a factor?
thanks for replying
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Possibly a plugged fuel filter or garbage in the tank at the pickup line. Try to see how much fuel pressure you have when the motor is hot, your fuel pump may be dying. But with it starting after an hour or so, that spounds like something in the line stopping fuel flow. Once it sits, the problem loosens up till it all plugs up again.
Good Luck,
Brian
Good Luck,
Brian
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wamsleyb - the fuel pump failed a year ago and I replaced it then. (When it failed the diaphragm went bad and I came out to find gallons of fuel siphoning out pooling under my vehicle, still running out from the fuel pump onto the ground).
thanks for your comments but I don't think it's the fuel filter because it was running fine at high speed but would die at idle.
thanks for your comments but I don't think it's the fuel filter because it was running fine at high speed but would die at idle.
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Cargo Master
Joined: May 2003
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From: Earth
Sounds like an ignition module to me as well. I had similar symptoms on my '79 1-ton, and it was the module. I finally had to replace it when it died on me on the way to work one day and would not restart. I hitched a ride to a pay phone and called my dad. He said that he was sure it was the ignition module as everything else was working too good, and this was a classic symptom in his opinion. ((The symptoms being, it would run fine, and then just quit, sometime restart right away, sometimes start a little later............eventually not starting at all)) Anyway, he said he would stop off and pick up a new module and just replace it. He came and picked me up, went to my truck and he said "see if it will start first" (so as not to replace the module on the road). Well, the truck fired up. So, I drove it to work and replaced the module. Now, 9 years later, the truck hasn't died since. It was the module. Now, my only suggestion would be to see if your module can be tested first before springing the $$$ for a part that may not need to be replaced.
That's just my experience...
That's just my experience...
Last edited by 53fatfndr; Jul 26, 2004 at 10:09 PM.
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Posting Legend
Joined: Sep 2001
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The aftermarket modules fail all the time. Get a Motorcraft module if yours tests bad. They cost more but they won't leave you stranded about every year. Mount the replacement module with 1/4" spacers (I use 5/16" hex nuts) under it to let cooling air flow under the module.
Freshman User
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Before you start replacing parts, look at the gasoline you're using. Had the same problem with a 79 F150 w/ 400. In Albuquerque, NM. They add methanol or something in the winter to aid the smog problem. A couple of the stations keep the same gas all year round. Not a problem in the cooler temperatures, but come summer, the stuff boils off in the engine compartment and vapor locks. Once my truck sat for an hour or so, it would restart fine. Once it heated up again, vapor locked all over again.
Solution was DON'T use fuel with that crap added in the summer. IF this is your problem, changing parts won't do anything to solve your problem and will only waste money. I know, I found out the hard way.
Solution was DON'T use fuel with that crap added in the summer. IF this is your problem, changing parts won't do anything to solve your problem and will only waste money. I know, I found out the hard way.
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From: Smithville TX.
Posting Legend
Joined: Sep 2001
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Check out the threads on hot fuel return if you have vapor lock problems. I came up with a system to take care of vaporlock but later found that Ford was already using it on the 460. 
Parts may be available from Ford, just look up the "hot fuel return" system used in carbed 460's during the 80's.
Parts may be available from Ford, just look up the "hot fuel return" system used in carbed 460's during the 80's.