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GT40 fuel pumps inoperative |
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Green 2000 
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Joined: August-08-2011 Location: Texas Status: Offline Points: 28 |
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 Posted: May-16-2016 at 1:32pm |
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there is a PCM GT40 manual in the files that I have downloaded. Unfortunately, it is apparently for a newer model than mine as the pictures and diagrams do not match my model. Mine is a 2000.
I will PM my email to you just in case. |
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Finally a Nautique Owner
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tryathlete
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Joined: April-19-2013 Location: Lake Villa, IL Status: Offline Points: 1797 |
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Posted: May-16-2016 at 1:00pm |
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Do you Need the PCM GT-40 manual? You seem quite competent at delving deep and their manual is incredibly detailed I have a copy on my iPhone. Pm me your email if you want me to send it to you.
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Green 2000
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Joined: August-08-2011 Location: Texas Status: Offline Points: 28 |
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Posted: May-16-2016 at 12:56pm |
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I have checked the lanyard switch.
What else can cause neither pump to run when the STO terminal is grounded? |
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Finally a Nautique Owner
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tryathlete
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Joined: April-19-2013 Location: Lake Villa, IL Status: Offline Points: 1797 |
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Posted: May-16-2016 at 12:53pm |
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PIP sensor is worth checking.
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Green 2000
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Posted: May-16-2016 at 12:51pm |
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thanks again, but the problem is that neither pump will run. There is an electrical issue somewhere.
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Finally a Nautique Owner
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Gary S
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Joined: November-30-2006 Location: Illinois Status: Offline Points: 14096 |
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Posted: May-16-2016 at 12:46pm |
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I would fully check out the lanyard switch
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tryathlete
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Joined: April-19-2013 Location: Lake Villa, IL Status: Offline Points: 1797 |
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Posted: May-16-2016 at 11:41am |
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Did you find the 30A fuse near the battery? I've never gone looking there. My fix came from two replacement parts, the Low Pressure pump and the ignition switch (which weirdly actuated the starter after a hot run and heading back into the dock--). Did you replace the small fuel line inside the FCC when you opened it up? A known issue with that small clear fuel line cracking has been troublesome for many.
Did you check your fuel vent and anti-siphon valve on the tank? |
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Green 2000
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Joined: August-08-2011 Location: Texas Status: Offline Points: 28 |
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Posted: May-16-2016 at 11:35am |
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thanks again for replying. I have checked the kill switch, but did not bypass it. Based on the sequence of events it is highly unlikely to be the culprit.
I reviewed the guide you linked to (and thank you) but did not find anything on there except that the relays may be bad. I had already replaced both with no joy. thank you again for taking the time to reply. |
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Finally a Nautique Owner
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tryathlete
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Posted: May-16-2016 at 11:05am |
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tryathlete
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Posted: May-15-2016 at 11:58pm |
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tryathlete
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Posted: May-15-2016 at 11:51pm |
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I'm sure you've been through the "poor man's GT-40 troubleshooting guide"
Discussion on here, but if not....see next post Just to be sure, you've bypassed the kill switch, right? I once had an issue where the boat would die coming into dock and I fixed it by replacing the ignition switch (key-type). another random thought--before I fixed my low pressure fuel pump (by replacing it) I used to hold the ignition in the start position longer than necessary to make sure the PIP signal was received by the ECU to keep the pumps going and it worked to make the boat start as a stopgap measure. These GT-40's are temperamental little buggers but once you sort them out they're fantastic boat engines. |
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Green 2000
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Posted: May-15-2016 at 11:42pm |
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thanks for responding, but it did not die when I turned around; it died before the turn island.
Neither fuel pump is running and I don't how to further trouble shoot that. |
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Finally a Nautique Owner
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tryathlete
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Posted: May-15-2016 at 10:14pm |
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The boat died when you turned around which leads me to guess (that's all I can do) that your anti-siphon valve may have gotten stuck closed blocking fuel flow. Is there fuel in the line to the low pressure pump?
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Green 2000
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Posted: May-15-2016 at 6:55pm |
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And just in case it matters to the whole troubleshooting process, here is the sequence of events:
- skied one pass and boat died at turn island; restarted, died, restarted died, restarted but died while pulling me out; restarted again and died again; pulled it back to my dock - at the dock it would start and die, so I figure it is a fuel problem - put new filter in the FCC, which of course drained the FCC; the FCC was pressured and I had to use the Schrader valve to relieve the pressure before changing the filter - tried to cycle the pumps to fill the FCC but neither pump would cycle - shorted the STO to ground per thread instructions and neither pump comes on - replaced both relays with BorgWarner relays from Oreilly and no change - have pressed each of the reset buttons numerous times - starter still turns the engine over but no pressure builds in the FCC I have downloaded the PCM GT40 manual from the site and it is not the same as my GT40. I am guessing the manual is for a newer model GT40 than mine. My FCC is the spin-on type, at front left with HP pump inside FCC. The manual indicates a 20A circuit breaker located on/near the LP pump. I do not have one of those. And both my ECA and fuel pump relays are identical, unlike what is in the manual. I have so far been unable to locate a manual that is the correct one for my GT40. |
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Finally a Nautique Owner
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Green 2000
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Posted: May-15-2016 at 6:12pm |
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I have a 2000 PCM GT40. Neither the LP nor HP pumps come on when I hit the start button and there is no fuel pressure at the FCC. I run the starter for several cycles and no pressure builds in the FCC. When I ground out the STO terminal per the thread I have studied, neither pump comes on.
I also purchased two new relays at O'reilly and got the same results. It may be hidden in a thread somewhere, but I could not find anywhere that explained what it means, if neither pump operates when you ground the STO terminal. Can someone please help me with a next step? Is there a fuse somewhere? I don't have the fuse in the battery box that I have seen mentioned in threads. Thanks in advance for any help. |
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