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2005 GT40 5.8 won't run
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rob200020 View Drop Down
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Joined: July-21-2012
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    Posted: April-14-2020 at 8:35pm
Engine cranks but cuts off after 2 or 3 seconds. It runs as long as I hold starter.
I bypassed the safety switch. It is good. I sprayed starter fluid into throttle body. Engine still cut off. Put in new plugs.
I never hear the fuel pump before starting. Should I hear it?
I disconnected the oil pressure sensing unit. Didn't make any difference. There is an extra wire on the oil pressure sensing unit. Is it a backup for low oil pressure?
Should I check the pressure on the fuel injection rail?
Thanks
Rob
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C_Heath View Drop Down
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Originally posted by rob200020 rob200020 wrote:

Engine cranks but cuts off after 2 or 3 seconds. It runs as long as I hold starter.
I bypassed the safety switch. It is good. I sprayed starter fluid into throttle body. Engine still cut off. Put in new plugs.
I never hear the fuel pump before starting. Should I hear it?
I disconnected the oil pressure sensing unit. Didn't make any difference. There is an extra wire on the oil pressure sensing unit. Is it a backup for low oil pressure?
Should I check the pressure on the fuel injection rail?
Thanks
Rob


I had the same issue and it was a lose wire on the ignition kill switch. I Put a new Switch on to begin with but as I was installing it I notice that as I was messing with the wires, the fuel pump would run. If I squeezed the wire it would run again to I replaced the connectors and it’s fine. Do you have a key ignition or push button ? Something is causing the pumps not to run. I would revisit the kill switch.
1979 Calipso Runabout (the boat that got it all started)
1988 Mastercraft ProStar 190 (sold)
2000 Pro Air Nautique/GT40
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8122pbrainard View Drop Down
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Points: 41040 		Post Options Post Options   Thanks (0) Thanks(0)   Quote 8122pbrainard Quote  Post ReplyReply Direct Link To This Post Posted: April-14-2020 at 10:06pm
Originally posted by rob200020 rob200020 wrote:


I bypassed the safety switch. It is good.
Rob

How did you bypass it and did you check it with the VOM for continuity?


54 Atom

77 Tique

64 X55 Dunphy

Keep it original, Pete
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C_Heath View Drop Down
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Points: 207 		Post Options Post Options   Thanks (0) Thanks(0)   Quote C_Heath Quote  Post ReplyReply Direct Link To This Post Posted: April-14-2020 at 10:14pm
I’m guessing he removed the switch and tied the 2 wires together. That should have cut the fuel pumps on I think.
1979 Calipso Runabout (the boat that got it all started)
1988 Mastercraft ProStar 190 (sold)
2000 Pro Air Nautique/GT40
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gun-driver View Drop Down
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Yes you should hear the pumps prime the rail.
Put a pressure gauge on it then get back with the results.
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C_Heath View Drop Down
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Points: 207 		Post Options Post Options   Thanks (1) Thanks(1)   Quote C_Heath Quote  Post ReplyReply Direct Link To This Post Posted: April-14-2020 at 10:39pm
Originally posted by gun-driver gun-driver wrote:

Yes you should hear the pumps prime the rail.
Put a pressure gauge on it then get back with the results.


Run over and look at my fuel pressure tests. Let me know what you think.
1979 Calipso Runabout (the boat that got it all started)
1988 Mastercraft ProStar 190 (sold)
2000 Pro Air Nautique/GT40
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KENO View Drop Down
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Points: 10668 		Post Options Post Options   Thanks (0) Thanks(0)   Quote KENO Quote  Post ReplyReply Direct Link To This Post Posted: April-15-2020 at 8:39am
2005 and gt40 don't exactly belong in the same sentence .

From your old posts it looks like a 2000 model year boat and it must have a replacement engine that was put in maybe in 2005? There were no model year 2005 gt40 engines, they'd gone the way of the dinosaur by then.

How about some more info and maybe the numbers on the engine ID tag to be sure you're gonna get some good advice.
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rob200020 View Drop Down
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Clarification to engine. I have a PCM 5.8 HO model PLPPOOOM Mfg date 08-05. It is a replacement engine for my 2000PAN. I have push button ignition.
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rob
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rob200020 View Drop Down
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Points: 15 		Post Options Post Options   Thanks (0) Thanks(0)   Quote rob200020 Quote  Post ReplyReply Direct Link To This Post Posted: April-15-2020 at 3:43pm
Problem solved. A tripped ignition run breaker. Thanks for all your help. It's been a good learning experience for me.
rob
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KENO View Drop Down
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Points: 10668 		Post Options Post Options   Thanks (0) Thanks(0)   Quote KENO Quote  Post ReplyReply Direct Link To This Post Posted: April-15-2020 at 3:48pm
Originally posted by rob200020 rob200020 wrote:

Problem solved. A tripped ignition run breaker. Thanks for all your help. It's been a good learning experience for me.


Glad it's running.

Since they usually trip for a reason, did you find the reason?

That ID tag is still a mystery.

Could you post a picture of it?
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rob200020 View Drop Down
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I made a pic. I'll upload as soon as I figure out how to do it.
rob
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