07-24-2015, 11:55 PM
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Motoxxx43 is currently offline
Status: Admiral
Join Date: Jul 2012
Location: Pueblo West, CO
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My Year: 2000
My Model: Shabah 250
My Engine: 7.4 MPI Bravo I
Thanks: 86
Thanked 75 Times in 75 Posts
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Vapor lock issue
Long story short... I was unaware I was having a vapor lock issue in my 7.4mpi until I recently worked on two 502s. They did not have the "cool fuel" set up an the issue was narrowed down to heat being the culprit to starting after engine was hot.
After two days on the water tubing an the like I had my 7.4 vapor lock on me two times. I did some reading and found a few fixes. Can't say how I'll remedy my issue yet but I have some ideas now. I was bleeding off some hot fuel/vapors at the fuel rail Schrader valve an had luck.
I'm going to attribute my issue to a well insulated engine compartment.
https://www.perfprotech.com/blog/art...ser-vapor-lock
Apparently there was a TSB for this issue.
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