Fuel pressure regulater shim mod?

[treyloco]

does any one know the thread size and pitch for the gauge adapter?

 

[King0581]

I have seen people call it a -20 oring x 1/8" NPT. I'm really not sure cause I just ordered mine from ITP.

 

[444ornothing]

I took the plug with me to carquest auto parts. They said it was a 7/16. We were able to use a hydraulic fitting and hose. I used a 12" hose that had the high pressure fittings for both the gauge and the 7/16 fitting for the fuel filter housing. It worked well.

 

[treyloco]

has anyone seen a difference in mpg since shimming the fpr? At $4 a gal. I don't want to lose to much off of my 17 mpg.

 

[JRJ04]

has anyone seen a difference in mpg since shimming the fpr? At $4 a gal. I don't want to lose to much off of my 17 mpg.

if anything, it should help. the fuel pressure they are at now does not allow them to run as efficiently as they could.