Boat issue

Pcm zr6 (chevy 6.0), no power to fuel pump, pump definitely good, can find a fuse, everthing else works, starts with starting fluid, wires look ok, dont have the diagnostic tool, anything else i can check?

Look for the fuel pump relay

4Waters said:

Look for the fuel pump relay

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This. Chevy ECU pluses +12v to the fuel pump, and ground to everything else. Check the relay first, then check for +12v on the proper pin on the ECU.

Check your fridge for beer and get Whiteys boat ready for the week. :thumbsup

Wheeler said:

Check your fridge for beer and get Whiteys boat ready for the week. :thumbsup

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tried the beer thing, didnt work, dies whitey even have a boat, he talks about it but ive never seen it

LargeOrangeFont said:

This. Chevy ECU pluses +12v to the fuel pump, and ground to everything else. Check the relay first, then check for +12v on the proper pin on the ECU.

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Thanks guys, found three relays, any way to test or should i just start swapping with a new one?

cofooter said:

tried the beer thing, didnt work, dies whitey even have a boat, he talks about it but ive never seen it

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Whitey can't even swim, why he would even own a boat is beyond me. :eek

One is probably a blower motor relay if they all look the same you can just swap them around and see if the fuel pump runs and something else stops working if so it's a bad relay just number them before swaping.

If it is a relay, why did it blow??? Carry a few extra from now on

Thanks, think i found the bad one, all three are the same, report back later!!!

fishing fool said:

If it is a relay, why did it blow??? Carry a few extra from now on

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Not sure, battery was dead when i got here and i tried to start it with one of those emergency battery chargers, maybe related, i dunno......

Well, is it fixed.

Unfortunately not, bought a good relay and swapped it one at a time with the 3 on the boat, still no power to fuel pump. Headed home now, will have to borrow a code reader next time I'm out or find a pinout diagram of the ECU. Thanks for your help!

Apparently there is a fuse, just need to find it. I have the manual at home so I will look.

Sorry I couldn't help more, hope it didn't ruin your weekend.

cofooter said:

Not sure, battery was dead when i got here and i tried to start it with one of those emergency battery chargers, maybe related, i dunno......

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Did you then charge or replace the battery so that you had full voltage? You should have checked in with me, didn't know you were here.

What type of boat and what brand of motor? Is it a Volvo? Those are notorious for the fuel pump going bad.

Outdrive1 said:

What type of boat and what brand of motor? Is it a Volvo? Those are notorious for the fuel pump going bad.

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PCM (Pleasure Craft Marine) in a ski boat.

obnoxious001 said:

Did you then charge or replace the battery so that you had full voltage? You should have checked in with me, didn't know you were here.

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Thanks, Barry. Yep, full battery, checked voltage when cranking, also tried a brand new one. Thought crossed my mind to call you, but I thought it was relay for sure, then just ran out of time.

Found the fuse block buried in the wiring harness, my neighbor checked it for me, fuel pump fuse is good.................

Diagnose your problem. Start at the fuel pump and work back. Test for 12v at the FP when the key is turned on. Make sure you test it immediately as the key is turned because it won't stay on for long. If there is 12v, check the ground. If the ground is good, it's the FP. If no 12v, check the battery power into the relay for 12v all the time. Then check to see if the ECU is triggering the relay with 12v when the key is on.

12V hot to relay all the time

12V switched to relay when key is turned on (turns on relay)

relay sends 12V to FP if first 2 above are working. (assuming all grounds are good)

Thank you BDMAR. Back to the relay, everything is good. I need to check the ECU output to relay, I have the pinout diagram now. Also, I understand from the mfr that there is a 5A fuse
on the ignition "run" position (voltage switched) line that goes to the ECU that may have blown - w/o that, the ECU will not activate fuel pump, injectors, etc. Need to check that. Boat in Parker, I'm in Colorado, will be able to check in a few weeks.

Well, after checking every wire and every connection, and the signals on the ECM, I pulled the ECM and sent it in for testing. Turns out it was fried. They o/n me a new one, and it fired right up. Gotta give a shout out to OBD Diagniostics (mefiburn.com) for their excellent service and turn around.