Pressure regulator bad????
Assuming you have it plumbed correctly, this has to differences in the gauges. Either or both gauges could be wrong, IE one could be reading 1 lb too high, and the other 1 lb too low
Also, leaving a gauge(s) inline is terribly hard on them, unless they have a protective orifice or are oil filled. If the needles vibrate when the needles are opening, they won't be accurate for long.
I like to use refrigeration Schrader valves. You can buy these in all kinds of configurations, but for fuel systems, you can get them with 1/4" flare and a Schrader valve and cap, and the other end in 1/8" male NPT. In fact what I use for checking my (now EFI) pressure is an old refrigeration manifold and hoses, with the "high" side gauge replaced.
Like so:
My 5 buck thrift store refrigeration manifold, with a 0-30 psi gauge on the left. (For TBI) I'll have to replace it when/ if I go to MPFI. The nice thing about using one of these is you can check pressure, shut things off, and use the hoses to bleed off pressure so you don't spray all over
Assuming you have it plumbed correctly, this has to differences in the gauges. Either or both gauges could be wrong, IE one could be reading 1 lb too high, and the other 1 lb too low
Also, leaving a gauge(s) inline is terribly hard on them, unless they have a protective orifice or are oil filled. If the needles vibrate when the needles are opening, they won't be accurate for long.
I like to use refrigeration Schrader valves. You can buy these in all kinds of configurations, but for fuel systems, you can get them with 1/4" flare and a Schrader valve and cap, and the other end in 1/8" male NPT. In fact what I use for checking my (now EFI) pressure is an old refrigeration manifold and hoses, with the "high" side gauge replaced.
Like so:
My 5 buck thrift store refrigeration manifold, with a 0-30 psi gauge on the left. (For TBI) I'll have to replace it when/ if I go to MPFI. The nice thing about using one of these is you can check pressure, shut things off, and use the hoses to bleed off pressure so you don't spray all over