Help.. Boat will not start

[dustinsnipes]

2006 Tige 20v 5.7 PCM engine. I have no fuel pressure, and no power going to the fuel pump. Swapped around all the relays and checked the fuses still nothing. Does anyone have a wiring diagram for the fuel system or any suggestions would help. Everything I have checked leads me to believe the ECM might be bad

[JCP]

Do you have spark?

[Wakeman22]

Have you checked the wire for 12 volts at the pump? On some models there are 2 pumps. A low pressure and high pressure. Check both to make sure the wires are attached and with 12 volts. The connector on the low pressure pump was loose on mine and gave me trouble shooting and trouble problems for years till I found it.

[dustinsnipes]

Yes everything is working like it should except I have no power going to either one of the fuel pumps. I don't see any burnt or broken wires and have power at the relay. The only thing I can figure it's not sending a signal from the ECM to the the pumps. A wiring diagram of the fuel system would be extremely helpful

I'm a auto mechanic but not very familiar with these marine setups. Someone also mentioned the kill switch could be causing it but wouldn't that cause it also to have no spark?

[Stingreye]

Try jumping the relay and see if the pump powers on.


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[dustinsnipes]

I'm not exactly sure which relay (none of the wires are the same color coming from the fuel pump) is the fuel pump but I swapped all three of them around and I do feel one click on when I turn on the ignition but does not seem to click off as like one would do in a car

[Stingreye]

With a test light or volt meter check the turn on plug from where the relays go when someone turns the key but doesn't crank. I think the fuel pump is the only one that powers on for 15 or 30 seconds then shuts off at key on. After you identify it, jump that relay to send power to the pump and see if it powers. It's common I think for the wiring on the pump to not have a good connection. Look for a thread by Whitlock (I can't remember his exact handle), I think he was the one who had similar symptoms and it was just the wiring at the pump was not clean and secure.


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[Stingreye]

Although I am not even a shade tree mechanic just another boat owners that attempts to troubleshoot his problems. Hopefully one of the experts will chime in with better advice or at least tell you if I am giving you bad info .


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[JCP]

Not sure if the kill switch stops spark or fuel or both, but if you have spark now, try checking for spark with the kill switch tripped, if the spark stops, you can eliminate the switch being bad. I assume you already made sure the kill switch is in the run position.

[Stingreye]

Good point! Plus make sure throttle is in neutral.


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[Wakeman22]

The connector that goes to the low pressure pump. The small pump sometimes is loose and will not make good contact. You have to feel for it as it may not be visible. I had to pinch mine a little to close the contacts in the connector and my erratic troublesome problem that plagued me for a few years was solved. The way I found it was when I was replacing the fuel filter. Oh! Have you or the shop recently replaced your fuel filter. It may have been knocked loose. I would still not eliminate the fuel relay yet.

[dustinsnipes]

I unplugged the connector for the LP pump and checked with a test light no power going to LP or HP pump.

[dustinsnipes]

Thinking about straight wiring both pumps into a toggle switch but don't know if that would work I did it once before on a older model boat

[lee]

Have you checked the kill switch?

[UNSTUCK]

You said you have power at the relay right? But the relay is not sending power to the pumps, right?

Without knowing your system here is my guess. Terminal 30 in the relay is always hot. Terminal 85 or 86 is hot with the key on. If terminal 30 is not hot, but 87 is, than that's ok too. So when the key is turned on power is sent to 85 then the computer takes over from there. When it is happy it grounds 86 internally, closing that circuit and switching the relay. With the relay switched, power travels from 30 to 87 (or visa versa). If you follow the wire out of 87 it will go to your pump.

You can do one of two things. Jump 30 to 87 and your pumps should run. Or, better yet, run a wire from 85 or 86, whichever one is not the hot one to ground. This tests the relay to see if it is good. It should click and then the pump turns on. To do this you need to pull the relay out of the socket just enough to be able to touch the ground side terminal but you also need to have it in far enough to maintain all the connections.

If you run the ground wire and it all works like it should then you know your ground wire going to the computer is broken or bad connection, or your computer is simply not switching.

We'll tackle that when you get to that point.