[joefrantz]

I've got a Holley FPR that I picked up from a used parts dealer.
Is there a way to tell if it is the 1-4 vs 4-9 psi variety?
The only identifying number on it is 34R-6657B directly above the Holley logo. The Holley site doesn't list any data based on this number, and their photo is the same for both pressure ranges.
I assume that the diaphram is the only differentiating factor???.

Thanks for your help.
Joe Frantz