Merc vapor lock kit??
08-12-2010, 03:23 PM
#1
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Merc vapor lock kit??
Ive got a 1994 454 Mag EFI (complete with a VST tank!!) that is really having some issues with vapor lock anytime the temperature tops 90 degrees....
I did a search online and see a reference to a mercury vapor lock kit and was curious if anyone has the bulliten # or a part #?
I did a search online and see a reference to a mercury vapor lock kit and was curious if anyone has the bulliten # or a part #?
08-12-2010, 04:37 PM
#2
Charter Member # 55
Charter Member
That kit is not for the VST systems. It is for the later Cool Fuel systems. Your problem is most likely in your VST tank. The screen filters are probably plugged up.
08-12-2010, 05:30 PM
#4
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Thanks
08-13-2010, 01:41 AM
#5
Charter Member # 55
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I have never actually taken one apart. From the way it was explained to me, it was pretty straight forward. Just take it apart and clean the filter screens.
I had a friend that was having issues with his VST and vapor locking. He ran a bunch of Sea Foam in a tank of fuel and the issue went away. I think he used at twice the recommended amount of Sea Foam and treated about 150gallons of fuel. That was early this Summer and he has not had any vaporlocking since.
BTW, ethanol fuel will vaporlock much easier.
I had a friend that was having issues with his VST and vapor locking. He ran a bunch of Sea Foam in a tank of fuel and the issue went away. I think he used at twice the recommended amount of Sea Foam and treated about 150gallons of fuel. That was early this Summer and he has not had any vaporlocking since.
BTW, ethanol fuel will vaporlock much easier.
08-13-2010, 07:41 AM
#6
There is a good possibility you are vapor locking in the mechanical fuel pump. Next time it happens grab some water from the cooler and pour it on the bowl of the mechanical fuel pump. It will have to crank a bit to refill the VST. If that helps mount a small piece of plastic between the fuel pump and the motor to shield it from the exhaust heat. That is all the vapor lock kit consisted of as far as I can tell.
08-13-2010, 07:58 AM
#7
Charter Member #1171
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The vapor lock kit is an electric boost pump kit.
for a brief period, merc eliminated the mechanical pump on the sea pump.
Those are the ones this kit is designed for
for a brief period, merc eliminated the mechanical pump on the sea pump.
Those are the ones this kit is designed for
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08-15-2010, 01:03 PM
#9
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Vapor Locking Kit p.n. 862264A4 is what is used to solve the problem. This is what I used with the VST tank. I tried cleaning screen with no luck. Best way to tell is the next time it happens pull off Water Separator filter is it is not full you are vapor locking.
08-16-2010, 01:01 PM
#10
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I have never actually taken one apart. From the way it was explained to me, it was pretty straight forward. Just take it apart and clean the filter screens.
I had a friend that was having issues with his VST and vapor locking. He ran a bunch of Sea Foam in a tank of fuel and the issue went away. I think he used at twice the recommended amount of Sea Foam and treated about 150gallons of fuel. That was early this Summer and he has not had any vaporlocking since.
BTW, ethanol fuel will vaporlock much easier.
I had a friend that was having issues with his VST and vapor locking. He ran a bunch of Sea Foam in a tank of fuel and the issue went away. I think he used at twice the recommended amount of Sea Foam and treated about 150gallons of fuel. That was early this Summer and he has not had any vaporlocking since.
BTW, ethanol fuel will vaporlock much easier.
Thanks guys for all your help!
