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Old 04-03-2006, 10:56 PM
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Join Date: Nov 2005
Posts: 33
Fuel Pump Pressure

I have an 82' 300TD turbo and am getting ready to do an svo conversion on it. When I first got the car, a mechanic advised me to install an electic fuel pump and though i was with him when he did it, I did not know enough at the time to pay attention to the psi for the pump. I am going to test the pressure that it is putting out but I have a question about how much pressure I should be getting out of the pump.

I have read on this forum that the MB lift pump should be putting out 15 psi but then I have also read that when buying a facet pump, one should look for a pump that puts out 2-5 psi.

Why is there a discrepency between these two pressures?

If the pump that I have is putting out too high or two low a pressure, can this damage the IP?

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Old 04-04-2006, 12:34 AM
bgkast's Avatar
Rollin' on 16s
Join Date: Dec 2005
Location: Vancouver WA
Posts: 6,528
The 2-5 psi electric pump should be used to supplement the stock pump, not to replace it. It is used to help the more viscous oil along the lines. A pump that puts out too much pressure can, I believe, fill the crankcase with oil if the diaphragm in the stock pump fails, however the car will continue to run due to the electric pump operating.

Personally I just used larger than stock lines on my oil side of the system and am just using the stock pump. I may add a low-pressure pump near the tank in the future, but so far I have had no problems.
1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine
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