Too much fuel pressure!!!!!

[BS CUDA]

Just installed Holley electric billet fuel pump (12-700) and billet regulator (12-845) with return to tank. Fired car and pressure gauge says 12 PSI. Thought for sure gauge crapped out - purchased new one and still reads 12. When car initially starts pressure is at 9PSI and increases to 12psi within about 15 seconds. Fuel system is run like this:
- 1 foot of-10 braid line from 1/2" pickup on stock tank to 100 micron filter which is directly attached to elec pump.
- then roughly 3 feet -8 braid to 10 micron filter
- then -8 braid up to regulator on fender and - 8 to carb
- -6 braid continuous return to tank.

 When I remove the return line from the tank and run into gas can(very carefully) the pressure still starts at 9PSI and increases to about 11PSI and I get great flow to can. I cannot seem to decrease the regulator down below 9 PSI. I think I may have a dud regulator or perhaps -6 return line restricting or......................?? Just once I wish I could install a performance upgrade and just drive the dam car 

[Oldschool]

Sounds like a bad fuel pressure regulator. Not uncommon, they crap out all the time. I have a spare in my garage all the time. Since I have had this car, I am on my 4th regulator. The symptoms are always the same - high fuel pressure that can't be regulated down. When that happens, I have learned to go ahead and put another one on the car.   

[moparmaniac59]

Wow, sounds like Deja-vu. I had the same problem and installed 3 fuel pressure regulators in a row that were all bad (brand new out of the box). I was beginning to think it was me, but alas, the 4th worked just fine. I agree with Ken, sounds like a bad regulator. 


                                                                               Matt B.

[BS CUDA]

Just installed Holley electric billet fuel pump (12-700) and billet regulator (12-845) with return to tank. Fired car and pressure gauge says 12 PSI. Thought for sure gauge crapped out - purchased new one and still reads 12. When car initially starts pressure is at 9PSI and increases to 12psi within about 15 seconds. Fuel system is run like this:
- 1 foot of-10 braid line from 1/2" pickup on stock tank to 100 micron filter which is directly attached to elec pump.
- then roughly 3 feet -8 braid to 10 micron filter
- then -8 braid up to regulator on fender and - 8 to carb
- -6 braid continuous return to tank.

 When I remove the return line from the tank and run into gas can(very carefully) the pressure still starts at 9PSI and increases to about 11PSI and I get great flow to can. I cannot seem to decrease the regulator down below 9 PSI. I think I may have a dud regulator or perhaps -6 return line restricting or......................?? Just once I wish I could install a performance upgrade and just drive the dam car 

UPDATE - it was indeed a bad regulator, purchased a non billet Holley reg with return and works like a charm.

[73EStroker]

Upon recommendation from Mallory and having had lots of pressure problems myself - I switched to 3/8 return line (from 1/4") and problems went away for the last 2 years now.