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-   -   Fuel lifting pump making noise when first starting engine (https://www.sailnet.com/forums/diesel/329554-fuel-lifting-pump-making-noise-when-first-starting-engine.html)

capta 05-10-2019 07:09 PM

Re: Fuel lifting pump making noise when first starting engine
 
Quote:

Originally Posted by krisscross (Post 2051601198)
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.

It's not about pressure at that point in the system, just GPH. Obviously, your pump must pump enough fuel for the diesel to run.
We on sailboats don't have much problem with even the smallest pumps rated by GPH but imagine a motor vessel using 75 to over 100 GPH per engine. That's when electric fuel pumps start getting expensive.

capta 05-10-2019 07:33 PM

Re: Fuel lifting pump making noise when first starting engine
 
Quote:

Originally Posted by wsmurdoch (Post 2051601218)
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.

Bill

If I was running a gas engine, I'd certainly agree with you, but on our small diesels where ignition protection is unnecessary, the cheap ones seem to do just fine.

RegisteredUser 05-10-2019 07:37 PM

Capta is right.
Im outta this one....

SeanM26 05-11-2019 01:36 AM

Automotive technician here; I recommend my customers avoid NAPA parts if at all possible. If it fails in a car, no big deal. Boats are not cars.

Also, a failed diesel lift pump can cause the injection pump to fail.

Cassidy 05-13-2019 03:22 AM

Re: Fuel lifting pump making noise when first starting engine
 
Typically a Yanmar has a fuel bypass that sends excess fuel that the engine doesnít need to run, back to the tank. Well, at least the 4-cyl ones do, no reason to think the smaller ones are different.

So if the engine switch is on and the engine isnít started, the pump you describe will continue clicking interminably as the fuel cycles back to the tank. These pumps click each time they deliver fuel, yours may click more frequently while the engine runs as a result of the through flow system.

I installed a diesel flow pump normally fitted to a Ford Explorer, pumps adequate volume for a 4JH4E and gently buzzes in the background. The downside is that the fuel is warmed by the through-flow and brings the temperature of the whole fuel tank up. I havenít had problems yet but I often wonder about condensation, diesel bug and all those other horror stories.

overbored 05-13-2019 10:21 AM

Re: Fuel lifting pump making noise when first starting engine
 
Quote:

Originally Posted by Cassidy (Post 2051601674)
Typically a Yanmar has a fuel bypass that sends excess fuel that the engine doesnít need to run, back to the tank. Well, at least the 4-cyl ones do, no reason to think the smaller ones are different.

So if the engine switch is on and the engine isnít started, the pump you describe will continue clicking interminably as the fuel cycles back to the tank. These pumps click each time they deliver fuel, yours may click more frequently while the engine runs as a result of the through flow system.

I installed a diesel flow pump normally fitted to a Ford Explorer, pumps adequate volume for a 4JH4E and gently buzzes in the background. The downside is that the fuel is warmed by the through-flow and brings the temperature of the whole fuel tank up. I havenít had problems yet but I often wonder about condensation, diesel bug and all those other horror stories.

the Yanmar does have a return line on the 4 cylinder and smaller engines but it is from the high pressure injectors and not the lift pump side of the injection pump so it only returns fuel when the engine is running. the reason the engineers have the fuel return back to the fuel tank is to cool the excess fuel that is coming back from the hotter fuel injectors. most Yammers have a mechanical engine driven lift pump and really don't need an electric lift pump unless the tank is placed to low in the system to meet the Yanmar requirements.

Capt Len 05-13-2019 11:29 AM

Re: Fuel lifting pump making noise when first starting engine
 
A thought... GMC's with unit injectors pump an immense amount of fuel back to the tank to cool their injectors,Little engines do the same but more discreetly. If your system has a short closed loop to save running a return line back to tank any heat or bubbles or crud stays in the loop

capta 05-13-2019 02:58 PM

Re: Fuel lifting pump making noise when first starting engine
 
Quote:

Originally Posted by SeanM26 (Post 2051601268)
Automotive technician here; I recommend my customers avoid NAPA parts if at all possible. If it fails in a car, no big deal. Boats are not cars.

Also, a failed diesel lift pump can cause the injection pump to fail.

lol Well you see, that's the difference between us marine engineers and you Automotive technicians. Whereas you've got to go buy a replacement, we've got one or two spares stuck away in a drawer somewhere and can make the change before you've got your order into NAPA guy.
Two completely different mentalities; sadly, we don't have a NAPA store out there on the briny. lol

kmacdonald5 05-13-2019 11:49 PM

Re: Fuel lifting pump making noise when first starting engine
 
Get a Facet fuel pump. https://www.facet-purolator.com/ They usually last the life of the engine. I like the Posi-Flo and Gold Flo pumps. A cheap $20 backup isn't a bad idea though.

krisscross 05-14-2019 12:14 PM

Re: Fuel lifting pump making noise when first starting engine
 
Just bought a replacement pump to have as a spare. Itís a Facet pump. About $85 at NAPA.
Thank you all for your help. As always, very useful. Best sailing forum I know.


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