fuel pump not coming on?
12-28-2011, 01:17 PM
#2
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Location: Washington
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Year: 1998
Model: Grand Cherokee
Engine: 4.0 I6
Do you have an FSM? I would assume that you gain access to the pump and then apply 12v to the power in (sorry, at work right now so I don't know the pumps pin-out) and see if the pump primes, if not then you're pump is bad if it does then your relay/wiring is bad.
12-28-2011, 02:54 PM
#3
Originally Posted by 721
Do you have an FSM? I would assume that you gain access to the pump and then apply 12v to the power in (sorry, at work right now so I don't know the pumps pin-out) and see if the pump primes, if not then you're pump is bad if it does then your relay/wiring is bad.
I jumped the orange and black wire to no avail. The other three are small and I am assuming they go to the sending unit, but not sure.
Thanks
12-28-2011, 10:08 PM
#7
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Year: 1989 xj sport 2dr
Model: Cherokee
Engine: 12 hole bosch Injectors
current must be confirmed at the pump wiring you can bypass all you want if theres no current at the relay/fuse your not getting anywhere
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12-28-2011, 10:26 PM
#11
Originally Posted by bryweb
There is no safety switch/relays on the grands from what I read.
12-28-2011, 10:34 PM
#12
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The ASD relay sends power to the primary side of the fuel pump relay. If you jumped 30 & 27 you jumped the Secondary side of the relay bypassing the ASD. You need to go back to the fuel pump and check for B+ and Ground. Also with 30 and 27 jumped bang on the fuel tank. If the pump starts to run then replace it
12-28-2011, 10:54 PM
#13
The ASD relay sends power to the primary side of the fuel pump relay. If you jumped 30 & 27 you jumped the Secondary side of the relay bypassing the ASD. You need to go back to the fuel pump and check for B+ and Ground. Also with 30 and 27 jumped bang on the fuel tank. If the pump starts to run then replace it
I will check it in the morning.
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