Author Topic: E10/15 fuel and vapor lock.  (Read 67 times)

Offline old blue 75

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E10/15 fuel and vapor lock.
« on: May 22, 2020, 12:25:54 PM »
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?

Offline Kenth

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Re: E10/15 fuel and vapor lock.
« Reply #1 on: May 22, 2020, 12:59:50 PM »
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.

Offline Cliff Ruggles

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Re: E10/15 fuel and vapor lock.
« Reply #2 on: May 23, 2020, 07:57:40 AM »
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!.......

Offline old blue 75

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Re: E10/15 fuel and vapor lock.
« Reply #3 on: May 23, 2020, 09:19:34 PM »
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.