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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? Thanks, Sasha |
#2
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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.
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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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