My 90 ran pretty well with a noisy pump. I planned on replacing it and fuel filter anyway because the car had been sitting.
While waiting for those parts to arrive, the car decided to run like crap with no power, so I parked it. I replaced with new bosch pump and filter and still had the same run condition. I chased other branches of the decision tree (it needs a head gasket job for sure), before discovering that while I have initial pressure of 36 at the rail, that doesn’t hold for long and when I jump the relay, I have a “spitting” condition of intermittent fuel delivery.
I worked my way back, first discovering it at the rail, disconnecting the line at the outlet of the filter, same low spitting condition. Disconnected pre-filter and have the same spitting direct from the pump with lots of air, not a steady stream - though the pump seems to be running quietly.
Ran out of daylight and time.
I know my next step is to disconnect on the feed side of the pump to check if the pump is getting unobstructed fuel direct from the tank, but I’m just thinking through why a brand new pump would behave this way. I REALLY do not want to take the tank out.
Please somebody hold my hand and tell me we don’t have to take the tank out.