so i just got this car together again, and am chasing down a miss/stumble in the upper rpm's at full (or even mostly full) throttle. ignition checks ok, but my fuel pressure is acting weird.
the gauge on the shcrader valve bounces 1-2 psi up and down constantly. has been doing this since i first fired it up this year with a stock-replacement regulator, but back then it was bouncing 5-6psi. swapped it to my old kirban (no egr now, so it actually fits) and it seemed to clear it for about a day before the 1-2psi bounce showed up.
i've set the kirban fpr to 40-42psi with vac off, with vac at idle it drops to 37-39 iirc.
with full throttle, the gauge will jump back up to 40-42 for a second, then drop down to 25-30.
i'm thinking the pump may be on the way out, it's a 190lph walbro that i put in back in 2008. are there any checks to verify this?
i also had a crushed section of supply line (car slipped off jack) that i fixed using a couple double-flare fittings and unions. is it possible for this (or some other restriction somewhere, clogged filter etc.) to cause this kind of fuel pressure drop?
the gauge on the shcrader valve bounces 1-2 psi up and down constantly. has been doing this since i first fired it up this year with a stock-replacement regulator, but back then it was bouncing 5-6psi. swapped it to my old kirban (no egr now, so it actually fits) and it seemed to clear it for about a day before the 1-2psi bounce showed up.
i've set the kirban fpr to 40-42psi with vac off, with vac at idle it drops to 37-39 iirc.
with full throttle, the gauge will jump back up to 40-42 for a second, then drop down to 25-30.
i'm thinking the pump may be on the way out, it's a 190lph walbro that i put in back in 2008. are there any checks to verify this?
i also had a crushed section of supply line (car slipped off jack) that i fixed using a couple double-flare fittings and unions. is it possible for this (or some other restriction somewhere, clogged filter etc.) to cause this kind of fuel pressure drop?