1993 502 mag efi vapor lock issue
07-28-2011, 10:54 PM
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1993 502 mag efi vapor lock issue
Trying to help a buddy with a 1993 502 efi that seems to be vapor locking and a cold pack on top of the fuel pump on top of the engine next to the dist. does seem to stop it from occuring, did m/c have a fix for this that his boat may never have gotten done ???
07-29-2011, 01:31 PM
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they added cool fuel on later ones to help....but still was a bandaid as far as I'm concerned...they should have done a true return to the tank...that would cure the issue
07-31-2011, 09:22 AM
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Yes ! Merc. has a water check valve that goes into the hose before the fuel pump and it keeps water up in the top of your engine. It is a large blue and yellow plastic check valve that comes with directions on where to put it. About $100 Good Luck
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07-31-2011, 06:41 PM
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A buddy installed the Merc water check valves on his boats on the advise of his marine mechanic. His boat still vapor locks as much as before.
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bring a smile to your face when pushed down the stairs.
