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Old 23-09-2017, 06:13   #1
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Fuel Booster Pump

I was helping a dockmate get his engine running after a bio clog and filter change. This is an almost new Yanmar engine and I was really surprised to find that it has no low pressure pump and that the high pressure pump has to draw all the way from the tank. The whole thing was a bear to get the air out of the lines and full of fuel. It took us at least 5 tries of taking a hose off to vent and would be almost impossible in a seaway.

So my recommendation to him is an electric booster pump and I'm looking for model suggestions.

Thanks
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Old 23-09-2017, 06:54   #2
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Re: Fuel Booster Pump

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Originally Posted by sailorboy1 View Post
I was helping a dockmate get his engine running after a bio clog and filter change. This is an almost new Yanmar engine and I was really surprised to find that it has no low pressure pump and that the high pressure pump has to draw all the way from the tank. The whole thing was a bear to get the air out of the lines and full of fuel. It took us at least 5 tries of taking a hose off to vent and would be almost impossible in a seaway.

So my recommendation to him is an electric booster pump and I'm looking for model suggestions.

Thanks
You were misinformed. Yanmar engines (most of them) have a roller cell lift pump built into the high pressure pump. So there is a "low pressure pump".

Most Yanmar engines do a good job of bleeding themselves even with quite a lot of air in the lines.


If you want an auxiliary pump, there are plenty of good ones, made for cars. Like the old reliable Facet piezo-electric ones. I remember how happy I was to put one of those on the old BMW 2002 I drove in college, to replace the unreliable mechanical one. Still made, still cheap, still good.
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Old 23-09-2017, 07:43   #3
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Re: Fuel Booster Pump

There was no “Misinformed” I followed the fuel line and there is no lp pump!!!!
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Old 23-09-2017, 07:46   #4
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Re: Fuel Booster Pump

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There was no “Misinformed” I followed the fuel line and there is no lp pump!!!!
Au contraire, there most definitely IS a low pressure (lift) pump. It is built into the high pressure pump!

Example of an injection pump with integral roller cell lift pump:

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"Feed pump" in the diagram is the "low pressure pump". Lift pump.
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Old 23-09-2017, 08:23   #5
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Re: Fuel Booster Pump

Dockhead is correct, but a little facet fuel pump is still a good idea. Recently entering cocos keeling another boat had a engine failure, sucking air problem. I lent him a spare facet pump i had that got him going until parts arrived from Australia. Having the ability to push fuel through the system can come in handy.
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Old 23-09-2017, 08:33   #6
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Re: Fuel Booster Pump

Walbro or Facet are probably the best electric pumps, but most any work fine. NAPA has them for $20 or so.
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Old 23-09-2017, 08:59   #7
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Fuel Booster Pump

I like the facet pumps that look a little like frozen orange juice cans. I doubt you can get them for $20 or so.
In aircraft the low and high pressure pump being together is called a suction lift fuel system, very common in helicopters.
It is safer as any leak will have the engine suck air and not leak fuel.
I believe all gasoline marine engines are required to have suction lift fuel systems, you can't have a fuel pump in the tank for instance, like almost every car made in the last 30 yrs or so has.

If I were the friend, I would install an electric boost pump, but only use it for priming.
How do you bleed the fuel system on a Diesel that has a roller lift pump integral into the injection pump? There is no lever to wobble on a roller pump like there is on a diaphragm pump?

This is actually a good price, maybe EBay has better though
http://www.aircraftspruce.com/catalo...xoCpf8QAvD_BwE
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Old 23-09-2017, 10:22   #8
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Re: Fuel Booster Pump

Listen I’m not an idiot!!! But I’m not interested in some useless agurement when all I asked was for electric pump recommendations. If you want to agure about whether a part of the high pressure pump is the same start a thread.
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Old 23-09-2017, 10:27   #9
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Re: Fuel Booster Pump

Have you considered anger management councilling?
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Old 23-09-2017, 10:33   #10
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Re: Fuel Booster Pump

Welcome back, Don.
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Old 23-09-2017, 10:37   #11
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Re: Fuel Booster Pump

However, your the one that said it had no LP pump. Your were just being informed is all.
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Old 23-09-2017, 10:44   #12
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Re: Fuel Booster Pump

Sailorboy,

I put a simple 12v $25 automobile fuel pump in parallel to the fuel line to my Yanmar engine with stopcocks to isolate the pump when not in use.

I don't think the make or model is that important and it makes bleeding the entire system quick and easy without straining the starter motor.

I agree that academic discussions for simple problems are a PITA, I spent 25 years in complex medicine furthering the KISS principle.
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Old 23-09-2017, 10:57   #13
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Fuel Booster Pump

Sailor boy,

My Beta self primes. The tanks are both located just a little higher than the primary filter so I'm probably getting a little help from gravity.

If you're open to suggestions beyond adding a pump, how about a secondary RACOR and a dozen spare filters? I find this easier and faster to change. It keeps biogunk that much further from the engine. The issue may not be needing more pressure but instead keeping lines pristine requiring less pressure.

I'm very satisfied with my twin RACORs of this model.

Edit: *Extremely* Satisified

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Old 23-09-2017, 14:37   #14
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Re: Fuel Booster Pump

Quote:
Originally Posted by sailorboy1 View Post
Listen Iím not an idiot!!! But Iím not interested in some useless agurement when all I asked was for electric pump recommendations. If you want to agure about whether a part of the high pressure pump is the same start a thread.
You dont have to be an idiot to be wrong. Its not obligatory.

However, when gently and professionally corrected, your attitude could tip the scales...
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Old 23-09-2017, 15:42   #15
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Fuel Booster Pump

What model Yanmar is it? My Yanmar is self bleeding. Taking hoses off just makes it harder to start. Close the seacock, crank 'til she fires then open seacock. Nothing could be easier.
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