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Re: 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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You need to check fuel pressure with a fuel pressure gauge. The regulator is a good guess but the fuel pump can also be letting fuel pressure drop. Once fuel pressure drops on a hot engine the fuel in the fuel rail will boil and essentially be a vapor lock condition. Fuel pressure should be around 56 psi and hold steady for at least 45 minute to an hour. If it drops within a couple of minutes to check valve in the pump is probably bad and the fuel pump module will need to be replaced.
The other thing, when you replaced the fuel pressure regulotar is is possible that you did not get all the old pieces from the old regulator out of the fuel rail. It is common for the screen and o-ring from the old regulator to stay in the fuel rail and they need to be removed carefully with a small pick.
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.
Its built into the fuel pump in the tank and it is also used in conjunction with the fuel regulator to help with keeping the gas from getting to hot as it returns to the tank and cools the fuel. This is why you don't get Vapor lock on new cars because the fuel recycles continuously as the engine runs,
If the engine stalling occur when the engine is hot the most probable cause is a vapor lock, this is when gas boils before it reach the engine, when the engine is extremely gets hot, the gas boils and an air bubble is formed which causes the air/fuel mixture to be too lean, too much air and not enough gasoline, thus making the engine to stall. When you experience vapor lock, just let the engine cools down, have a mechanic to check your cooling system it might cause the engine to get extremely hot.
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.