'74 1.8L LJet/fuel pump, Fuel Pump not staying on Options

[RKramden]

This is my first time starting a topic, I don't know if I am even typing in the correct location, but I am having an issue with my '74 LJet and fuel pump. The pump starts with the ignition switch, Pump also runs when Air sensor arm is manually moved. However when starting, it seems that the air sensor is somehow cutting off the fuel pump circuit. The PO had bent the arm so it never opened, but I have bent it back to move as designed. If I disconnect the electrical plug to the Air Sensor, the car starts and runs fine......any thoughts? BTW I have replaced the dual relay, but that did not fix the problem.

[Rob-O]

Forgot to add, I looked at Fuel Injection Corp’s offerings. I don’t believe that they replace that board. I think their work includes cleaning the board, checking wire continuity, checking the ‘barn door’ flap for binding, adjusting the tension and position of the wiper arm. essentially bringing the unit back to factory specs.

There is a document floating around the ‘Net (itinerant air cooled.net maybe???) where someone explains the adjustments. I’d take that information with a grain of salt. But the document helps explain what the AFM does and how it works.

Even if you go the rebuilt unit from FIC, you might want to use a portable O2 sensor to have the air bypass set correctly for your engine.