Fuel pump relay
#1
Fuel pump relay
So my plan is to change out the fuel pump and filter. If I have it right, to depressurize you pull the relay in the black holder, not the red one. Crank it over and you're ready to go. I tried that but the engine keeps running..and running. No sign of it wanting to quit. What did I miss?
#2
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Thanks
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#7
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#8
You might check if a previous owner or mechanic may have modified the relay circuit as mentioned in this post:
https://www.jaguarforums.com/forum/x...0/#post2058300
Might explain your circumstance.
https://www.jaguarforums.com/forum/x...0/#post2058300
Might explain your circumstance.
#10
With the Black socket relay pulled, a few seconds is all you will get.
My thoughts:
Someone has bridged the actual Black Block, on the underside, to run that pump whenever the Ignition is ON. Reasons, NO IDEA, other than issues and did so for diagnostics and forgot to remove.
Earthing that Orange wire will only work to run the pump whenever the Ignition is ON, IF the relay is installed, so even with that, pulling the relay will kill the pump.
The relay in the Red socket is the Main relay, and that operates the Pump relay, the ECU, etc etc, so pulling that will NOT start the engine, as the ECU is dead.
My thoughts:
Someone has bridged the actual Black Block, on the underside, to run that pump whenever the Ignition is ON. Reasons, NO IDEA, other than issues and did so for diagnostics and forgot to remove.
Earthing that Orange wire will only work to run the pump whenever the Ignition is ON, IF the relay is installed, so even with that, pulling the relay will kill the pump.
The relay in the Red socket is the Main relay, and that operates the Pump relay, the ECU, etc etc, so pulling that will NOT start the engine, as the ECU is dead.
The following 2 users liked this post by Grant Francis:
Greg in France (04-25-2019),
jag-reflex (04-25-2019)
#11
The following users liked this post:
Grant Francis (04-25-2019)
#12
So I swapped out the fuel pump and filter. Popped the relay back in and cranked..no start. Reconnected the jumper wire and fired right up. I'll pick up a new relay next..
Thanks to all who chimed in on this thread.
Edit: new relay fixed it. Stupid jumper wire now in the bin. ta-dum
Thanks to all who chimed in on this thread.
Edit: new relay fixed it. Stupid jumper wire now in the bin. ta-dum
Last edited by jag-reflex; 04-25-2019 at 03:24 PM. Reason: addendum
The following 2 users liked this post by jag-reflex:
Grant Francis (04-25-2019),
Greg in France (04-26-2019)
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