Need some Electrical help Plz!!

[ncmountainMJ]

Ok for some odd reason now my 89 won't start. I dropped the fuel tank to remove the bed and thats when the trouble began. It will turn over and gets spark but the fuel pump won't come on. I hot wired the fuel pump and it is working. I checked the fuel pump relay and it comes on but then a few sec later it cuts off but the pump never comes on. Also after checking the wires at the relay I never get anything on the orange wire coming from the ECM. Is there any advice that you guys could give me as to what to check next... or mabey a bypass... any help would be appreciated!!

[redneck23ms]

did you disconnect the ground wire behind the drivers side tail light? if so thats your problem. that is where the fuel pump grounds

[Geonovast]

did you disconnect the ground wire behind the drivers side tail light? if so thats your problem. that is where the fuel pump grounds

:agree:

[HOrnbrod]

Also agree w. the above. But if the fuel pump ground is intact, check out these two threads - may help:

 

http://www.comancheclub.com/forums/viewtopic.php?f=2&t=15819&p=159628&hilit=relay+fuel+pump#p159628

 

http://www.comancheclub.com/forums/viewtopic.php?f=2&t=6977&hilit=relay+fuel+pump

[Donny88]

I'm having the same issue. I will check the ground on mine tonight. if you figure it out pass it on I could use some help