[JAM1775]

Get a $20 water filled fuel psi gauge from Summit and mount it with a tee directly on the fuel line by the carb. I would not push the motor for fear of not cutting OFF fuel but running very lean fuel. But it's always good to monitor fuel pressure. Do you have a voltmeter ? When the symptons appear connect it to your pump on/off switch. If that's good perhaps remove your ignition switch and check for 12V output there too. I once had a broken ground wire to my external electric fuel pump give me intermittant PIA problems. More seriously a few years later I had intermittent idle stalling and finally a 60mph dead stall on the highway. I did ALL the electric checks and found no reason why my fuel pressure gauge dropped from 6.5 to 1-2 instantly ...then at times back up to 6.5psi. Eventually I replaced the fuel filter, pump, regulator, blew out lines looking for obstructions. Nothing. I dropped the tank and found a loose fuel pick up baffle which could slide a bit sideways. The fuel pick up/float looked okay. I ordered a replacement tank for $100 but STILL at idle in my garage at a steady 12V with old tank at half full........2psi. Now it was not even rising. As I was swapping tanks I started to very closely inspect the fuel the pick up line. I noticed a very fine hairline CRACK on the higher portion of my fuel pick up line. BOOM. That was ghost I was chasing all along. If you have voltage drop your task is clear. If you have 12V everywhere yuo might try buying another $20 Summit fuel gauge, attach 2 tees and a foot of fuel line to each side. You could try starting backwards with psi checks at the top of the tank. Work your way forward section by section checking psi with the handheld gauge. Hope this helps.