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Old 02-11-2012, 02:24 PM
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Join Date: May 2005
Location: Fernandina Beach, Florida
Posts: 626
602 IP lift pump or pressure relief valve?

I've had a fuel pressure problem on my 1992 300D.

Basically, the fuel pressure is low at the IP - 4psi while cranking.

I've restricted the return line to the filter, and pressure increases over 10psi.

So I took off the pressure relief valve from the IP. It doesn't offer any resistance to flow - seems like the spring is completely wore out.

Should it be offering much resistance to flow? I know the 616/617 has about 14psi on the relief valve, but I don't know if it's the same on the 602. The FSM calls it a bypass valve and says nothing about opening pressure.

Any ideas other than ride around with a clamp on my return line?
__________________
1983 240D Silver/Blue "Sadie", unknown miles. 100k miles on WVO single tank, converted to 2 tank about 10k miles ago, FPHE, Injector Heaters, Aux Fuel pump. Alcohol/Water injection. Frantz oil bypass filter
1992 300D 2.5 Turbo Green/Tan "Jade" 267K miles Stock.
1992 300D 2.5 tan/tan "Rocky" on 2 tank WVO. Pressure actuated Turbo "rat's nest" surgery completed. 197k miles
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