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Old 08-09-2013, 01:52 AM
psaboic's Avatar
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Join Date: Jun 2004
Posts: 917
Electric fuel pump

After just finishing a two-tank conversion on a friends 84 300D I am seriously considering doing it on my 83 300D. The only thing I am wondering is this.....we used 3/8" fuel hose going from the second tank to the heat exchanger and then to the fuel switching valve, but did not install an in-line electric fuel pump to help the WVO along.

The system seem to work ok but he has only put about 100 miles on it so far, but should we have put an additional pump on it?

Lastly do you run your system with an extra pump or not.

Please let me know.....thank you,


2012 Mercedes ML350 Bluetec 52K (hers)
2002 VW Jetta TDI 203K (mine)
1998 Volvo S70 T5 Turbo 152K (kids)
1992 Ford F150 4WD 259K (wood getter)
1983 Mercedes 300D 343K (diesel commuter)
1965 Corvair Corsa 98K (fun car)
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Old 08-09-2013, 10:56 AM
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Join Date: Sep 2003
Location: Ft Lauderdale FL
Posts: 204

I do not use an electric booster pump because that becomes the weakest link. My 05 has one but it has to have it.

If you run coolant to the tank and back and have the fuel hose not cold all the time, it is not necessary to have boost pump. The factory fuel pump is really strong. If you are really worried about it have a looped return then it does not have to pump as much. I have done both ways. Many times very successfully.

Filtering is the hard part not converting. I have been saying this for ten years. Filtering is forever you only have to convert once, do it good.
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Old 12-28-2013, 06:18 AM
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love all animals
Join Date: Nov 2008
Location: bristol,tn
Posts: 5,716
I used a 10 psi diesel pump to push both fuels for years.Now that I don't run wvo I don't use one,but miss it.It made my car charge up mountains passing every vehicle with a electric pump.If I ever get another one it will be a walboro

mankind,our demise's, will be the universe's blessing
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