Check valve + Fuel pressrue regulator

[architect]

Hey guys,

Im about to install a FPR on my 78. I keep reading more and more about the benefits of check valves.

Is it true it helps with vapor lock? Im in Texas and it gets HOT! (or is this the opposite effect, keeping fuel under the hood and heating it up?) OR is vapor lock eliminate if you have a supply and return? seems like if the electric fuel pump is running, your just circulating hot gas back into the tank, and pull colder gas back to the carb?

Also, where do I install it? I see on the micro slides = a few inches after the carb on the return hose.

Or if on supply, do I install before the FRP or after? I had it simply on the supply line before I ripped all the rubber out, and it worked pretty great, instant start ups.

Thanks!

[kmead]

On the supply it keeps fuel from siphoning back to the tank. I would put it before the FPR if you decide to run one. An FPR really isn't needed if you have a return line and use an electric pump which is in the normal range of pressure in the first place.

Having a return, particularly with an electric pump, allows constant flow at lower rpm which can minimize vapor lock.

[architect]

On the supply it keeps fuel from siphoning back to the tank. I would put it before the FPR if you decide to run one. An FPR really isn't needed if you have a return line and use an electric pump which is in the normal range of pressure in the first place.

Having a return, particularly with an electric pump, allows constant flow at lower rpm which can minimize vapor lock.

Thanks for the info Karl! This was exactly what I was thinking.

Cheers