Bang on the bottom of the tank while a helper cranks the engine. Unlike GM pumps, Chrysler pumps rarely quit while driving. When the brushes in the motor are worn, they fail to start up. Banging on the tank often gets them started.
There is only voltage to the pump for one second after turning the ignition switch to "run", then again anytime the engine is rotating, (cranking or running), so banging on the tank is most effective during cranking.
Another test is to pop the cover off the fuel pump relay, reinstall it, and watch for a tiny spark when you squeeze and release the contact. No spark means most likely the brushes are worn and open circuited. A spark means the motor is trying to run but may be locked up. That was more of a full-size truck thing in real cold weather in the '90s. The pump bodies warped when cold. I never heard of THAT on a Dakota.
Friday, December 10th, 2010 AT 6:02 PM