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Thread: Fuel Pump has no Power
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05-06-2019, 03:28 PM #11Senior Member
- Join Date
- Aug 2006
- Location
- Millington TN
- Posts
- 204
Only carbureted engines have oil pressure activated switches for the fuel pump. The fuel pump in an EFI engine is controlled by the ECM. There is a small fuse holder with a cover that has three fuses. The fuse holder is attached to the ECM racket near the three relays. One of the fuses is a fuel pump fuse. you need to check it before you do anything else.
Larry Engelbert
Indmar Marine Engines
"Power to the Sport"
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05-06-2019, 11:00 PM #12Senior Member
- Join Date
- Oct 2013
- Location
- Ft. Collins, CO
- Posts
- 688
The '07 didn't come with a low pressure pump. Many have added one to help with vapor lock issues.
2007 Mobius LSV
1989 Sanger Skier DX - sold
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05-07-2019, 08:20 PM #13
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05-15-2019, 06:52 PM #14
Did you troubleshoot the tether cord kill switch? On my 06 that switch cuts the fuel pump
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06-01-2019, 09:27 PM #15Junior Member
- Join Date
- Jun 2019
- Posts
- 1
I have the same issue with no power going to the high pressure fuel pump. Checked relays and can't find any fuses, just circuit breakers with red reset buttons. What am I missing?
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06-19-2019, 05:48 PM #16
After a couple of weeks, the dealer called me and quoted me $4k to replace the fuel pump, the ECU and the battery. The fuel pump runs when you connect it directly to a battery, so I don't think its bad. The battery is 2 months old and just needed to be charged.. I told them I'd come pick it up and wasn't paying $4k for them to repair a bunch of stuff that isn't broken. Not sure how to check the ECU, but maybe that's an issue. I did check the little fuses and all the relays mounted on the front of the engine.
I checked again today, and my meter reads .05v at the fuel pump. That doesn't change when you turn the switch on and it just drops a bit when you crank it. Any advice on what to do next would be greatly appreciated.2007 LSV
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06-19-2019, 09:06 PM #17Junior Member
- Join Date
- Apr 2014
- Posts
- 5
I had a similar issue with my 1998 Supra. It turned out that I had a bad fuse link feeding the engine electronics with lower voltage. In this situation, the computer didn't have enough power to switch on the fuel pump relay. Before I replaced the fuse link, I got it running by bypassing the fuel pump relay with a short piece of wire. I would suggest checking the fuel pump relay and the voltage at the engine computer. Good Luck!
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06-22-2019, 09:33 AM #18
Check the kill switch with your multi-meter. It’s directly inline with the fuel pump
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04-19-2020, 02:09 PM #19
I finally got around to working on this boat again.. I sent the ECM in for diagnostics and he said it was totally fried. Probably due to a power surge or battery connected backwards. Got a new ECU installed and have the following really weird problem now.
I turn the key and don't hear the fuel pump run, so I put a meter on the fuel pump to see if its getting voltage and it magically starts working. As long as I have a volt meter on the power terminals of the fuel pump, it works perfectly and the engine runs.. as soon as I take the volt meter away, the pump stops working and the engine dies.
I think I'm pretty smart, but there must be some mystical electricity stuff going on that I just don't understand. Anyone have any ideas?2007 LSV
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04-19-2020, 04:42 PM #20