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914World.com _ 914World Garage _ Fuel Pump wiring

Posted by: Fishey Jul 16 2018, 12:33 PM

I have a 1973 1.7 that I am currently working on at my shop.

The fuel pump relay gets ground from pin 3 (white wire lower left of board 4 pin connector) It does this great for 1.5 seconds to power the fuel pump relay and activates the fuel pump. However, when cranking pin 3 does not deliver ground and I am sure my problem is on what provides the ground to pin 3 but for the life of me I cannot find a diagram. Anyone have a diagram or helpful information?

Thanks
-Ronald Swift

Posted by: Jeff Bowlsby Jul 16 2018, 01:31 PM

If I understand your situation, the ECU controls the ground. You might also test/clean your FP relay on the relay board, test/clean the FI harness grounds at the back of the engine and test/clean the relay board grounds under the relay board to the sidewall.

Posted by: Fishey Jul 16 2018, 02:48 PM

Fixed, My problem was the Distributor sensor was not making good contact inside and wasn't sending the signal needed for the ECU to provide ground.

The car runs like a top again!