Fuel lifting pump making noise when first starting engine - SailNet Community
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post #1 of 23 Old 05-09-2019 Thread Starter
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Fuel lifting pump making noise when first starting engine

My NAPA electric fuel pump is making a noise when the ignition key is turned on. Noise is kind of clicking. It only happens when engine is started for the first time. Is that normal? I will buy a new pump just in case but I donít want to put it on if I donít have to. Any steps I need to take to make sure I donít get air into my fuel injection pump? Your help is greatly appreciated.

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post #2 of 23 Old 05-09-2019
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Re: Fuel lifting pump making noise when first starting engine

Clicking is the internal solenoid bringing the pressure up to normal. Normal. If you delay starting the engine and clicking persists ,the pump may be leaking back or there is a leak somewhere (Good fuel to pump so it's not sucking on a limited supply?) If you do open a line to replace or? the worst may be you may have to bleed the engine .Everyone should know how to do that anyway
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post #3 of 23 Old 05-09-2019 Thread Starter
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Re: Fuel lifting pump making noise when first starting engine

Thanks, Len. I hope thatís what it is. Any idea what pressure is that pump producing? The engine is Yanmar 3HM35F. I could not find that parameter in my engine manual. I want to buy a right pump and they go by pressure requirements.

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Re: Fuel lifting pump making noise when first starting engine

The 3 cyl yanmar in our generator has an electric fuel pump that automatically primes the fuel system, when you hit the start button. It buzzes, more than clicks.

You said NAPA. Is that some sort of aftermarket thing?
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Re: Fuel lifting pump making noise when first starting engine

An equal low pressure priming pump costs <$20
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Re: Fuel lifting pump making noise when first starting engine

Yep, normal. Our Onan also clicks until the fuel is up to pressure and we often hear it when running the glow plug before starting.
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post #7 of 23 Old 05-10-2019 Thread Starter
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Re: Fuel lifting pump making noise when first starting engine

Yes, its a NAPA pump that PO installed between the Racor filter and the injection pump. Any idea what fuel delivery pressure is needed there? I would like to have a backup and guy at NAPA tells me I need to know that. I have read somewhere that itís about 6 to 8 psi.

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post #8 of 23 Old 05-10-2019
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I dont have that engine but afaik...it is a low pressure 4-7 pump.
Look for an ID number on that napa.
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Re: Fuel lifting pump making noise when first starting engine

Not much info on that pump that can be seen without uninstalling it.

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Re: Fuel lifting pump making noise when first starting engine

For a replacement pump, spend some quality time on the Walbro fuel pump web site. https://www.walbro.com They make USCG approved marine fuel pumps and are the standard Many people sell them.

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