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Discussion Starter · #1 ·
I've got a universal 5411 with the mechanical fuel pump that requires you to crank the motor to bleed the system and it's a huge pita.

i'm trying to figure out what some of the options are available to add in between the racor and the mechanical pump?
 

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You can't put the two pumps in series, but you could put them in parallel so either could operate. If you go to the trouble of adding an electric pump, just bypass the engine driven one and use the electric all the time. Any fuel pump suitable for diesel should be fine. Go with a low capacity as the 5411 is only 11 HP.

Not sure why you seem to be needing to bleed the fuel system so often. Only had to bleed my 5411 once in 20 years.
 

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Discussion Starter · #3 ·
I guess you didn't have to change fuel filters very often :confused:

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
 

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I guess you didn't have to change fuel filters very often :confused:

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.
 

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Discussion Starter · #7 ·
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.
 

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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.
 

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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.
 

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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. :eek:
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. :D

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.
 

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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.

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. :eek:
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. :D

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.
 
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