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Kohler 7.5KW Marine genset with L654 engine, convert to electric fuel pump


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Old 02-07-2019, 02:35:18 PM
stevegnh stevegnh is offline
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Default Kohler 7.5KW Marine genset with L654 engine, convert to electric fuel pump

My generator is a 1989 7.5R marine generator with the L654 engine. Spec is 106275-A and the serial number is 223353. The previous owner added an electric fuel pump onto it, but I don't believe it was done correctly.

First, I believe the pump used may be putting out too high of a pressure. I'm reading that this engine and carb likes around 1.5psi. The Facet PosiFlo pump used is for 1.5-4psi, so not sure how it regulates itself to be on the lower end. I'm thinking it doesn't.

Second, while I find this pump is solid state, I don't believe it is ignition protected for use in a boat's engine compartment.

And third, for wiring it up, the installer spliced into the auto choke wire, so I'm not sure if the pump is even getting 12v. I'll have to check that. It must though, as the generator will run, but I'm told by someone the positive of the fuel pump should be hooked to pin 70 in the control panel.

This has all been done, with original mechanical fuel pump still in place. The problem is the carb leaks gas. I'm not sure if it's a carb issue (bad bowl, gasket), torn diaphragm in the old pump, or too much pressure, or a combination of all of them. I also was told the fuel line to the carb should be no more than 1/4 to reduce chances of overfilling. I'm pretty sure the hose used is 5/16" ID.

So my plan is to remove the carb, clean it and rebuild it. I also want to completely remove the old mechanical fuel pump. I still, even with the electric fuel pump, have to use the prime level to fill the mechanical pump with gas, so what's the point of the electric pump??

So my questions are what really needs to be done to delete the mechanical pump, is the fuel hose size ok, and what would the recommended electrical fuel pump be for a boat, with the right pressure, and how should it be wired.

Thanks for any help and tips.

Here's a pic of the setup, so you can see the wiring splice and how the electric pump gas line just goes into the old pump's body.
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Old 02-07-2019, 02:54:04 PM
stevegnh stevegnh is offline
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Default Re: Kohler 7.5KW Marine genset with L654 engine, convert to electric fuel pump

To add too, the reason why I don't want the mechanical pump in there at all is so I don't need to have to prime it with the lever. To do this I have to remove the engine hatch and climb down there to prime it, then climb out and start it up.
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