Fuel pump not coming on with diagnostic junper.
04-21-18, 11:26 AM
#1
Fuel pump not coming on with diagnostic junper.
What’s up guys!
Welp, I took the FD out for an hour drive this morning.
Everything ran great.
Parked for about an hour, then wouldn’t start.
I wasn’t hearing the fuel pump come on, so I jumped the terminals at the diagnostic block to test.
Nothing.
I checked the 20A fuse under the dash, and it seems fine.
Unfortunately I don’t have any tools with me, but wanted to see what other tricks I can try?
Maybe the FP relay? Can I swap any of the relays to test?
thanks!
Welp, I took the FD out for an hour drive this morning.
Everything ran great.
Parked for about an hour, then wouldn’t start.
I wasn’t hearing the fuel pump come on, so I jumped the terminals at the diagnostic block to test.
Nothing.
I checked the 20A fuse under the dash, and it seems fine.
Unfortunately I don’t have any tools with me, but wanted to see what other tricks I can try?
Maybe the FP relay? Can I swap any of the relays to test?
thanks!
04-21-18, 12:27 PM
#4
Stock injectors, rails, lines, and pressure reg.
Wiring to the pump is all stock too.
I’m at my buddy’s shop now so I’ll grab a multi meter and see if I’m getting any voltage back there.
Failing that, I’ll hot wire the pump to see if she chooches.
Yes, I checked the EGI fuse, as I first thought it might have been flooded.
Visually it looks fine, I’ll put a continuity test on it when I get back to double check.
04-21-18, 03:10 PM
#5
Ok this is strange.
I can hotwire the fuel pump and I can hear it come on, but no start.
I went to check codes, and with TEN and GDN shorted, I only get a solid CEL. It won’t blink for codes. Only solid.
When I shorted the fuel pump terminals on the diagnostic block, the pump wouldn’t come on either.
Could this be something else, or did something happen to my ECU?
i tried using a small segment of copper wire instead of the paper clip for the junper, but that didn’t make a difference.
Thoughts?
I can hotwire the fuel pump and I can hear it come on, but no start.
I went to check codes, and with TEN and GDN shorted, I only get a solid CEL. It won’t blink for codes. Only solid.
When I shorted the fuel pump terminals on the diagnostic block, the pump wouldn’t come on either.
Could this be something else, or did something happen to my ECU?
i tried using a small segment of copper wire instead of the paper clip for the junper, but that didn’t make a difference.
Thoughts?
04-23-18, 02:28 PM
#7
I had an intermittent no fuel problem recently. Turned out to be a flaky wiring connector in the fuel pump bulkhead. The one that goes thru the fuel pump hanger... terminal inside had corroded and wasn't making a good connection.
Might wanna check that... better safe than sorry. Had to fully unplug the connector to see the damage on mine.
Also, I'd like more people to confirm this but I don't think my pump stays on continuously when I jumper FP and GND either. I need to try again with my new pump setup and wiring.
Might wanna check that... better safe than sorry. Had to fully unplug the connector to see the damage on mine.
Also, I'd like more people to confirm this but I don't think my pump stays on continuously when I jumper FP and GND either. I need to try again with my new pump setup and wiring.
Last edited by alexdimen; 04-23-18 at 02:32 PM.
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04-23-18, 03:09 PM
#8
I had an intermittent no fuel problem recently. Turned out to be a flaky wiring connector in the fuel pump bulkhead. The one that goes thru the fuel pump hanger... terminal inside had corroded and wasn't making a good connection.
Might wanna check that... better safe than sorry. Had to fully unplug the connector to see the damage on mine.
Also, I'd like more people to confirm this but I don't think my pump stays on continuously when I jumper FP and GND either. I need to try again with my new pump setup and wiring.
Might wanna check that... better safe than sorry. Had to fully unplug the connector to see the damage on mine.
Also, I'd like more people to confirm this but I don't think my pump stays on continuously when I jumper FP and GND either. I need to try again with my new pump setup and wiring.
My problem ended up being the EGI relay. More specifically the connection made from the relay to the junction box.
What I learned that's interesting, is that if this relay isn't operating normally... it won't allow you to check codes.
05-02-18, 10:49 AM
#9
I had an intermittent no fuel problem recently. Turned out to be a flaky wiring connector in the fuel pump bulkhead. The one that goes thru the fuel pump hanger... terminal inside had corroded and wasn't making a good connection.
Might wanna check that... better safe than sorry. Had to fully unplug the connector to see the damage on mine.
Also, I'd like more people to confirm this but I don't think my pump stays on continuously when I jumper FP and GND either. I need to try again with my new pump setup and wiring.
Might wanna check that... better safe than sorry. Had to fully unplug the connector to see the damage on mine.
Also, I'd like more people to confirm this but I don't think my pump stays on continuously when I jumper FP and GND either. I need to try again with my new pump setup and wiring.
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