Re: Re: Re: 1986 Chev vapor canister...necessary?

Posted by Jon Hagen on April 22, 2003 at 19:22:42 from (69.26.16.239):

In Reply to: Re: Re: 1986 Chev vapor canister...necessary? posted by Dennis Minn on April 21, 2003 at 23:05:07:

The under hood decal showing hose routing shows each port on the canister and what it connects to.
Three fuel lines attached to the fuel pump?? The only thing I can think of is that some Chevys of the 70's-80's had a bypass line from the fuel pump that would allow a small amount of fuel to return to the fuel tank to prevent vapor lock.
The area of the front frame where the fuel line is located sees a lot of heat from the engine and exhaust system, if the engine would idle with AC on or in very hot weather,the fuel in the tank to pump line would get hot enough to boil and cause vapor lock. The small return line would allow a few ounces of fuel per minute to be pumped back to the fuel tank which constantly changed the fuel in the suction line and prevented vapor lock.
So the only three line pumps I am aware of have the fuel in line 2 fuel return line 3 fuel to carb line.

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• Re: Re: Re: Re: 1986 Chev vapor canister...necessary? Dennis Minn 15:47:50 04/23/03 (0)

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