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Anonymous Posted on May 05, 2012

86 chevrolet pickup vapor lock

Engine quits when hot

2 Related Answers

alicantecoli

Colin Stickland

  • 22516 Answers
  • Posted on Jun 30, 2009

SOURCE: Vapor Lock-1985 K10-Silverado Chevrolet Pick Up

1985?? you sure ,havent you heard of getting cash back on old vehicles against a new one ,no wonder poor old GM is going bust .As for engine stopping on you try flushing the cooling system out with a bit of caustic soda then refilling with water only if it works then refill with antifreeze ,add the caustic to rad when engine is cold then about 4 big table spoons should do it then run engine for 20 mins or so

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Anonymous

  • 5 Answers
  • Posted on Oct 31, 2010

SOURCE: When I get stuck in traffic in real hot weather I

Not an expert here but hope this helps. I had an 85 GMC Van and the previous owner had installed an electric fuel pump in engine compartment. I too would stall when hot. I finally relocated fuel pump to underneath the van and it ran cool and no more vapor locks.

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Vapor locking

When it dies check for spark at a plug wire , stick a screw driver in the end of the plug wire an hold near ground (metal on the engine ) Doesn't always have to be a fuel problem . Ignition modules can cause this also. Transistors in the module could be shorting out when hot . Rather then guessing as to what the problem is , test ! Fuel pressure test's too ! Do the cooling fans work , engine hot fuel vaporizing in the fuel rail . Check engine light on ?
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What makes it vapor lock

If it is a gas engine, its almost impossible to get vapor lock.
Vapor lock is when liquid gasoline turns to a vapor which will not flow thru a carburetor. The usual cause was hot fuel lines going to the carb.
Since the early 1980s engines have used fuel injection which uses liquid fuel under pressure.
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Fuel injected engines cannot get vapor lock. First you need to explain how you came to the conclusion if vapor lock. But this is an old post and probably will stay dead.
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Can vapor lock in the cooling system cause the engine to not spark and through off the camshaft sensor on a scanner in a 2001 dodge dakota sport 4.7 L v8 magnum manual transmission

No.
To begin with, there is no such thing as vapor lock in the cooling system. Vapor lock is when liquid gasoline vaporizes due to excessive heat. If the engine got hot enough to turn coolant into vapor the engine would seize up.
Do you have trouble code numbers ?
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When I get stuck in traffic in real hot weather I get a vapor lock and I just run out of fuel to the carburetor. The engine will restart if you prime the carburetor 1985 Chevrolet C 3500

Not an expert here but hope this helps. I had an 85 GMC Van and the previous owner had installed an electric fuel pump in engine compartment. I too would stall when hot. I finally relocated fuel pump to underneath the van and it ran cool and no more vapor locks.
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99 s-10, runs fine on an cool day, after 10 or 20 minutes on a very hot day (90 +) it will sometimes act like it's starving for fuel when taking off from a stop sign. I can rev engine up and it will "free"...

Does it do this if you run a higher grade of gas? Kind of sounds like vapor lock, but i got to admit, if it is, its the first time i have seen it happen on this new of a truck. When was the last time the fuel filter was chg.
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Sounds like vapor lock. Check to see if the fuel filter is clean/changed lately and that the fuel lines do not run past hot places on the engine. 
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Chevy Trucks, Blazers, S10 pickup and the like will vapor lock ecspecially the 2000 models. Do not tighten the gas cap past 1 click. There is a tube that runs from the top of the tank down and this gets hot and collapses or burns in half. We just bought a reinforced rubber tube cut it to lengh and use it instead of part and it's worked grat for 2 years so far.
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