Hi everyone-

I am having a terrible time with my efi to carb swap. I have some weird fuel pressure things going on and hope someone here can get this straightened out.

I am running a stock in tank efi pump. At the feed line under the brake proportioning valve on the frame, key on, I get a constant 60 pounds of f.p.

I am using a 5 port return style regulator. My feed in line is correct into the regulator. My exit line going from the regulator to the carb is correct. My return to the tank line is in the regulator correctly at the bottom port.

now, my f.p. reading after the regulator, but before the carbs dual feed line is an adjusted amount of 10 pounds. With the key on, pump energized, the reading after the regulator goes to ten pounds, but bleeds down steadily to no pounds. Does the return line to the tank cause this? I did not see the f.p. bleed down when I checked f.p. at the frame rail prior to making it to the regulator.

Also, when I put a f.p. gauge on the end of the dual feed line going into the carb, I have no pressure on the gauge. I take the gauge off, there is some pressure, but not much.

Given there is no pressure right at the carbs inlet line, could I have something wrong within the carb? Is the gas bleeding down within the carb? I have not got this thing running yet, but can put gas in the carb and it will fire.

can someone help here?

 

sometimes fuel preasure regulators bleed off

they call it a saftey feature