Quote Originally Posted by Ron View Post
???
Didn't you test it?
Are you thinking of the initial valve that I ordered off eBay? If so, I never installed that one as I don't believe it's rated to hold more than a 25psi back pressure, which would be inadequate for our application. However, I can't find documentation on this anywhere and the seller was unable to provide me with any concrete specs. This is also the reason why I didn't opt for the expensive S.U.R. & R. valve that others here have used with great success - the absence of specs and the fact that it's simply a NPT valve housing pre-assembled with multi-union connectors, thus creating two additional points that could potentially leak if faulty or ever failed.

I only just ordered the SMC 410 series valve on Sat. Should arrive on Wednesday. All the specs have been confirmed by both the retailer/seller (US Plastics) and the manufacturer (Specialty Manufacturing Corp), thus I have no doubt that it will work brilliantly for our application.

The SMC 410 series valve features a solid brass single piece housing, thus no additional joints unlike the S.U.R. & R. valve. The internals feature a grade 302 stainless steel piston valve with a viton inner seal that rests on the seat. It has a cracking pressure of 1psi and is rated to hold back pressures of up to 500psi. Plenty of head room for our systems, thus ensuring excellent longevity and reliability. And the best part is that it's MADE IN THE USA - Twin Cities metro region in Minnesota to be precise. I couldn't find where the S.U.R. & R. valve is made - perhaps someone who purchased this valve can tell us?

Whether or not it solves my hot start problems in particular remains to be seen, but everything else in the fuel system from the tank to the FD has been tested 3 separate times now and it all checks out as being fine, thus the only thing left to cause trouble is the fuel pump's internal check valve.