jaynasty

hi im new here, just signed up! im not sure if im posting this in the right spot but here it goes.... my k1500 z71 is not starting. when i turn the key the fuel pump doesnt prime. i replaced the sending unit and relay. still not getting the pump to prime. if i put fuel down the throttle body she will fire up until the fuel is gone that i dumped in. i did replace the computer with one i got from the junk yard... maybe it was a bad one i got? any other suggestion? i was told maybe a possible bad ground? fyi , i also changed the oil pressure switch and ignition switch.

kevinkpk

Take the fuel pump relay out, jumper 12 volts to the wire suppling the pump. If it doesn't come on, replace the pump.

jaynasty

i did that the other day and it turned on. any other suggestions?

T.Neff

Jay-deductive logic says it's the relay then.

jaynasty

the relay was done... would it be a ground? if so where would i look for a bad ground?

Chuzz

Have you changed to fuel filter? Does it have a pressure regulator on it? If so, check them.

RacerX

Did you replace the right relay? One is for the fuel pump, 1 is for the AC and 1 is for the ECM. If the relay for the ecm or fuel pump is out then the pump will never prime.

Chuzz

RacerX makes a good point. Check the # on the relays for all 3 he mentioned. If they're the same number and if they're the same, try swapping their positions. Number them along with the socket they come out of so you can put them back in the right place.