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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel > Which electric fuel pump to add in series on a M5411
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Diesel This is a forum dedicated to diesel engines and their applicable accessories.


Thread: Which electric fuel pump to add in series on a M5411 Reply to Thread
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Topic Review (Newest First)
10-16-2009 12:05 PM
timebandit I see you have protected the system by filtering the fuel before the pumps but--

Inlet Filter Screen: 70 micron--From the pump specs

Might be something to remember is you run into fuel starvation problems.


The other thing to remember is that with the eletric pump pushing through the manual on the the engine there is the danger that if the diphram on the manual ruptures the electric will fill the engine crankcase with fuel.

Only for this reason would I tee and go around the engine fuel pump.


Quote:
Originally Posted by SVCetacea View Post
I just installed this with a new Racor 500:

http://wem.walbro.com/distributors/FR/FRB-13.htm

Configuration is tank -> Racor filter -> Walbro -> engine (yanmar 2gm20f).

I turned the pump on and the Racor filled up in under 5 seconds.
I ran the pump for an hour (installed fuel polishing valves and T as well) and got about 7 oz of water out.
Switched it over to the engine, changed the primary filter and bled the line in a few seconds with just a quick flick of power to the pump.

The engine draws fuel just fine with the pump off (it is designed for flow thru).

Lots of lurking here led to this system which is simple yet very functional. Thanks to everyone who provided all the little bits and pieces of info.
10-15-2009 07:43 PM
crofrog
Quote:
Originally Posted by coral47 View Post
Hello All,

I am not technically expert, but just know that not possible to place both pumps in series, but we can place them in parallel, so that we can use that alternately.

Thanks!
09-16-2009 01:20 PM
SVCetacea I just installed this with a new Racor 500:

http://wem.walbro.com/distributors/FR/FRB-13.htm

Configuration is tank -> Racor filter -> Walbro -> engine (yanmar 2gm20f).

I turned the pump on and the Racor filled up in under 5 seconds.
I ran the pump for an hour (installed fuel polishing valves and T as well) and got about 7 oz of water out.
Switched it over to the engine, changed the primary filter and bled the line in a few seconds with just a quick flick of power to the pump.

The engine draws fuel just fine with the pump off (it is designed for flow thru).

Lots of lurking here led to this system which is simple yet very functional. Thanks to everyone who provided all the little bits and pieces of info.
09-15-2009 08:49 PM
deniseO30 uh.. I have a squeeze bulb on mine just like the one on a outboard. works great after filter changes. Never had a problem with it otherwise.
09-15-2009 06:42 PM
flatracker
You can put it in series

It is pretty simple to put the electric pump in series. I have mine mounted near the tank, with an of-off toggle switch. The lift pump will pull through the electric pump, and the electric pump will push fuel through the mechanical pump. I have a Yanmar 3GM, but there should be no difference. I'm with you, I have had to bleed mine several times in the past couple of years, for various reasons. With an electric pump it makes a nearly impossible task on the Yanmar fairly painless.
09-09-2009 02:33 PM
crofrog
Quote:
Originally Posted by JimsCAL View Post
OK, but are you sure the mechanical pump on the engine won't block the electric pump flow?
The mechanical pump would be downstream of the electric, with the electric pump living between the RACOR and the primary fuel filter on the engine.
09-09-2009 02:20 PM
JimsCAL OK, but are you sure the mechanical pump on the engine won't block the electric pump flow?
09-09-2009 11:27 AM
crofrog
Quote:
Originally Posted by JimsCAL View Post
I change my filters every year. Just fill them with fuel before you put them back together.

The problem with running them in series is that unless both are running, the one stopped can block the fuel flow. Just connect them in parallel and either can supply the fuel.
Well I guess you've had better luck than me not getting air into the high-pressure side. You can draw fuel through an electric pump when it's off, as long as you get one designed to not block the flow, which the facet pump above meets the criteria for.
09-09-2009 11:09 AM
JimsCAL
Quote:
Originally Posted by crofrog View Post
I guess you didn't have to change fuel filters very often

I know their are people on here that are running pumps in series just trying to figure out a part number before I just go buy one and play with it.

Chris
I change my filters every year. Just fill them with fuel before you put them back together.

The problem with running them in series is that unless both are running, the one stopped can block the fuel flow. Just connect them in parallel and either can supply the fuel.
09-08-2009 11:07 PM
crofrog awesome thanks!
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