Intermittent Fuel Pump Signal
Thread Starter
Joined: May 2006
Posts: 1,170
Likes: 8
From: NW Chicago Burbs
Intermittent Fuel Pump Signal I have an E38 ECM running an LY6 in my 72 Chevelle.
Sometimes the fuel pump will not prime or run.
Most of the time I go out, turn the key, it primes and fires right up. It will idle all day.
Occasionally I turn the key and it does not prime. I went for the first drive today and it when I give it some gas the motor responds, but when I let off, it dies and the fuel pump is not running. I try to restart, no pump. 1 minute later, key on fuel pump runs.
I have checked the relay and I have confirmed with a test light that the +12v signal from the ECM is intermittent. I can jump the relay and it runs the pump every time, key on or off.
Any idea what might cause this?
Sometimes the fuel pump will not prime or run.
Most of the time I go out, turn the key, it primes and fires right up. It will idle all day.
Occasionally I turn the key and it does not prime. I went for the first drive today and it when I give it some gas the motor responds, but when I let off, it dies and the fuel pump is not running. I try to restart, no pump. 1 minute later, key on fuel pump runs.
I have checked the relay and I have confirmed with a test light that the +12v signal from the ECM is intermittent. I can jump the relay and it runs the pump every time, key on or off.
Any idea what might cause this?
