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Old 08-01-2007, 20:54   #1 (permalink)
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Wink F250 460 suspect vapor lock

drove for approx 5 hours in 100 degree temp. 1/4 tank of fuel.
all of sudden engine quit. could restart but if backfired and quit. after
a while it would start but would not run under load. if I didnt try to start it
for ten mins or so it would run for 30 to 60 seconds but not under load.
left vechicle sit for 3 hours. restarted it and it was back to normal and I
continued on my trip. did i do damage to the fuel pump.
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Old 08-02-2007, 09:47   #2 (permalink)
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Re: F250 460 suspect vapor lock

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Originally Posted by lsac
1995 ford 460 (motorhome) (mileage 30,000) drove for approx 5 hours in 100 degree temp. with less 1/4 tank of fuel when it stopped. all of sudden the engine quit. I could restart engine but it backfired and quit. after a while it would start but would not run under load. if I didnt try to start it for ten mins or so it would run for 30 to 60 seconds but not under load. left vechicle sit for 3 hours. restarted it and it was back to normal and I continued on my trip.Question is the problem a vapor lock or sometihing else and did I do damage to the fuel pump.
help
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Old 08-04-2007, 22:50   #3 (permalink)
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Re: F250 460 suspect vapor lock

you may have vapor lock next time just loosen the fuel cap and see if it goes away.There may also be water in the fuel.
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Old 08-09-2007, 13:44   #4 (permalink)
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Re: F250 460 suspect vapor lock

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Originally Posted by puddle jumper
you may have vapor lock next time just loosen the fuel cap and see if it goes away.There may also be water in the fuel.
thanks puddle jumper appreciate the reply
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Old 08-09-2007, 21:15   #5 (permalink)
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Re: F250 460 suspect vapor lock

Fuel injected vehicles don't get vapor lock(theoretically). Fuel under 40/lbs pressure can't vaporize. That's precisely why they put the fuel pump in the tank--so the fuel is under pressure all the way up to the injectors. However, if the fuel pump wasn't putting out enough pressure or the fuel pressure regulator was going bad, that would cause the symptoms you've got. But it wouldn't cause the backfire. You should check out the pump and the regulator
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Old 08-10-2007, 17:17   #6 (permalink)
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Re: F250 460 suspect vapor lock

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Originally Posted by RickMN
Fuel injected vehicles don't get vapor lock(theoretically). Fuel under 40/lbs pressure can't vaporize. That's precisely why they put the fuel pump in the tank--so the fuel is under pressure all the way up to the injectors. However, if the fuel pump wasn't putting out enough pressure or the fuel pressure regulator was going bad, that would cause the symptoms you've got. But it wouldn't cause the backfire. You should check out the pump and the regulator
Thanks Rick... I have gone on two short trips since. two hours of driving each way... and have not had any problem or notice any thing out of the way ...
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