[Walt Fricke]

Interesting, Mike.

I've been wondering how important the check valve is in an EFI system. I know that on the CIS systems you need a functioning check valve to keep the residual pressure up within the Porsche specs. It goes down over time, but so does the temperature of the important parts, which I assume means you don't have hot start problems.

But with EFI why do you need to keep that pressure up? Isn't it going to build almost instantly as soon as you try to start the motor?

Or is it an issue of boiling temperature - higher with pressure, so residual pressure keeps the fuel out where it is hot from boiling until things cool? Preventing vapor lock? But if lots of guys with EFI don't use an RPV, and don't have hot start issues, what's the deal? Parts not installed can't break and cost nothing, etc.

As it turns out, I got a suitable Banjo from Pegasus, and the M18x1.5 intake fitting from (I hppe) RPW. I also got the banjo end cap nut - it is steel, and shipping cost 3x what the part cose. As best I can tell, you have to go to England to get an aluminum M12x1.5 end cap.