tired of the bullsh*t vapor lock!
#11
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Join Date: Apr 2007
Location: Williamston / Grand Haven, MI
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If you don't want to jump right into hardware changes I have had good luck with adding Marvel Mystery Oil to the fuel. This apparently raises the vapor pressure of the fuel.
#14
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Join Date: Feb 2012
Location: summer shade ky
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My uncle put a cheap primeing bulb,like what an outboard has spliced into his fuel line,it may be a little redneck but open the hatch give two or three pumps and 502 fires right up.
#15
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In the VST models, the pressure in the VST becomes higher than the pump can deliver, say 10psi in the VST vs 5-7psi max delivered. The top plug on the VST can be removed to relieve the pressure as a temp fix to get you home. I always leave mine finger tight so I can remove it.
#19
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This has been talked about a lot. If you have the VST tank, take the fuel rail return line off the vst tank and run it to your main gas tank instead. CP makes a nice piece that splices the fuel fill hose and allows you to run the return fuel line to it. Plug the fitting on the VST tank. Mine is a 96 502 mpi, and I had the same problems. I talked to the famous Eddie Young, and he suggested the above fix. Worked like a charm. Not a single issue since.
#20
This has been talked about a lot. If you have the VST tank, take the fuel rail return line off the vst tank and run it to your main gas tank instead. CP makes a nice piece that splices the fuel fill hose and allows you to run the return fuel line to it. Plug the fitting on the VST tank. Mine is a 96 502 mpi, and I had the same problems. I talked to the famous Eddie Young, and he suggested the above fix. Worked like a charm. Not a single issue since.