Originally Posted by weaver
My 89 150 has quit me. How can I tell which fuel pump has gone bad? I pulled the fuel line right behind the fuel filter and no fuel when trying to start. Is there a way to check if it's the pump on the frame (which would be nice) or in the tanks?
If you have a dual-tank set-up, it's pretty common for the switch to go out that determines which tank you're using. Check to make sure you're getting power at the pumps before you go replacing stuff.
Get a tester at the parts store, connect the ground on the tester to a grounded piece of metal. Jam the needle of the tester into the power wire in the pump harness and turn the key to "On" and see if it lights up. If it does on both pumps, then go from there. If no power is reaching either, check to see if the switch is getting power.