High Fuel Pressure - Carb'd BBC
 

Is it possible for a fuel pump to overpower a fuel pressure regulator? I bought a set of mechanical BG fuel pumps and regulators from a fellow OSO'er. The pumps are 1/2" NPT. I can't adjust the pressure down to anything below 12PSI. The gauge is mounted right on the "P" port of the regulator. If I screw the adjustment in all the way, goes to 15 psi! So I know the regulators are trying to do something. Both engines do the exact same thing. Trying to decide what to do next. My target is 6.5psi.

Many thanks, Randy

12 psi is way to high for a carb, are you sure the guage is correct or spring for new regs

You need to measure the fuel pressure close to the carb. Not sure what the "P" is for on the regulator.

Bypass flowing or obstructed ?

wrong regulators !!!!!! pressure for carb should be 7-9 PSI

No bypass. According to the regulator, there was just an In/Out/and a "P" port for what I thought was a pressure gauge. I think the "P" was actually an "R" for return. I ordered a pair of 110GPH pumps for it, shouldn't need a regulator, and easier plumbing fix. I hope this was the right way to tackle the problem.

Thanks for the replies.

BTW, be sure to check Amazon.com for parts like this. Pumps were $20/ea. less than Summit and free shipping.

"R" is probably Return, which does make it a bypass regulator. Pressure should be tapped close to the carb.