502 EFI vapor lock issues.... any suggestions? maybe add a booster fuel pump before the water/fuel separator? or insulate the fuel lines? Getting tired of messing with it.... setting it on fire will be next! not really, but i would like to fix it. Boat has 2 502's in it and they both vape out.
thanks.
Kevin

Are you sure you can get enough fuel to that fire?

Run a line from the fuel-water separator back to the tank.

Do you have a mechanical pump on your sea pump?

If not there is a kit for this problem

i put a Holley electric pump between my gas tank and fuel water seperator. It was easy to do. Wired it to the ignition so when the key is on, its on, when i turn the key off, its off... You could also wire it to a switch, just remember to cut it off.... I havent had vapor lock sinse.

http://www.jegs.com/i/Holley/510/12-815-1/10002/-1

i dont remember if i put the "red, blue, or black" pump on. not sure it would matter either.

yes i do have mechanical fuel pump. I don't understand why i just can't
bypass that pump and add a low pressure electric fuel pump.

Boomer did you bypass the mechanical fuel pump?

Vapor Lock or Vacuum Lock?

I think of vapor lock where the fuel is getting too hot. Vacuum lock is where it won't flow because of inadequate relief venting not allow ing gas to flow from the tank- it creates a vacuum.

You can insulate the line, but if the gas is getting to hot it's sometimes from the manual fuel pump.

Wannabe

Best solution I have seen

"Hello I have a 1995 Formula 271. Basically the same issues, took another rout, $hit canned VST tank, sea water transfer pump, the whole 9 yards and started over. Run an Aeromotive fuel pump, (filters fore and aft the pump) -8an to the fuel rail, -6an on the return to the boats fuel tank, through a fuel pressure regulator set at 48psi. then to the tank. No more "cool fuel" or any other crap. The fuel from the tank is always fresh, you eliminate the fuel on the pressure side getting hot from the engine and just "circling round until you get on the throttle. It's clean and simple, your fuel rails should already be drilled for 1/4 mpt."

Courtesy pocketchange22

So basically replace everything with Tank -> Filter -> Pump -> Filter -> Rail -> Regulator -> Tank