12v Fuel Pump Won't Stop - SailNet Community

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  #1  
Old 05-02-2008
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12v Fuel Pump Won't Stop

I have a brand new electric fuel pump that keeps running when the key is in the on position. It doesn't shut off when the pressure builds. I can't get the engine started either. It started and ran for about 2 minutes and then quit. Now nothing. I opened the bleeder on top of the fuel filter and nothing but diesel comes out. I have a Yanmar 2GMF. Any help would be appreciated.

-Riz
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Check for a fuel blockage, reverse blow all pipes, bleed system.
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Old 05-03-2008
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I'm guessing that when you installed the pump you introduced air into the system and now need to bleed the injection pump and injectors. Consult your manual on how to do it, not difficult. I don't remember what engine it is, but if a Yanmar (and maybe others) close the seacock while spinning the engine to bleed it and open it immediately when it starts.

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Old 05-03-2008
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Quote:
Originally Posted by jrd22 View Post
.... close the seacock while spinning the engine to bleed it and open it immediately when it starts....
This is good advice for any engine, anytime you may be cranking for an extended time without running (eg. more than 30 -40 seconds) whether to bleed the fuel system or simply just having a tough time getting the engine to catch.
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Old 05-03-2008
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Long story, but the fuel pump was installed by the marina where I bought the boat. It ran fine for over two hours on the sea trial. It also ran fine on the transport. It seem very odd to me.

-Riz
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Old 05-03-2008
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I've had this happen when the pump isn't getting good flow to it from the tank, even if the pump itself is pushing the fuel out just fine. On my setup, there is a bulb pump between the tank and the electric pump, and a few good squeezes on it to pressurize the line ahead of the pump were enough to get it to shut off and start functioning normally again. Don't know if this will help in your situation or not, though... good luck!
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Old 05-04-2008
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Okay, here is the deal...I talked to a mechanic at our marina and he came aboard to diagnose the problem. The pump is supposed to run when the key is in the on position. My engine wouldn't start because it was drawing air from somewhere. After bleeding the system, it started and I let it run for a couple of hours, checking where it could possibly be getting air from. I finally found that it was the bleeder screw on the top of my fuel filter. The top of the filter was wet with diesel. I wiped it off and a few minutes later it was wet again. Ha! Well, I tightened the screw and it didn't tighten. It is stripped. Problem is, it is not the bleeder screw that is stripped. It is the filter body. My plan is to replace the filter body and I should be up and running. Any tricks to replacing this?

-Riz
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