General Category > Quadrajet Carb Talk and Tips

E10/15 fuel and vapor lock.

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old blue 75:
I read some where lately that the e10/15 fuel will vapor lock in
carburetors when used with a mechanical fuel pump.
Is there any truth to this?

Kenth:
Carburetors are vented to atmosphere and cannot be "vaporlocked".
Vapor lock occurs in fuel lines heated by being too cloose to hot engine parts or exhaust system.

Cliff Ruggles:
Correct.

Another big problem I see is "rotten" or porous rubber fuel lines sucking air instead of fuel.  This is ALWAYS mistaken for "vapor lock" and easily fixed with a couple of pieces of rubber hose and some good hose clamps.

I would also warn folks reading this to ALWAYS run solid fuel lines on the pressure side of the fuel pump.  I'll bet 1 in 3 set-ups I see have had the factory steel line cut for one reason or another and a piece of rubber hose installed with a couple of clamps on it.  That's bad enough but folks NEVER put a "bulge" in the metal lines to keep the rubber hoses from slipping off.

That entire deal is a DISASTER waiting to happen!.......

old blue 75:
This is a 1986 chevy truck that is currently all apart.
 It will have new duel tanks and lines.
I would like to keep the mechanical fuel pump but if it will cause
problems I may change to a electric in line.
But I am not sure if a inline will draw from the far side tank.

old blue 75:
Does any one know what electric fuel pumps can have fuel pulled thru by a mechanical pump.
My thought is to put a electric pump in line but only use it when needed.
I was thinking of using this mechanical pump. https://www.summitracing.com/parts/ado-41216/make/chevrolet/model/camaro/year/1982/submodel/z28
And maybe a pump like this for inline.  https://www.summitracing.com/parts/hly-12-427
My thought is to wire the pump to a momentary switch for priming, and a full throttle switch
for high demand.

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