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Apparent fuel delivery issue in 1990 740 Rex Regina

posted by  Chris Mullet on  Wed Nov 7 11:17 CST 2012
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last visit: Fri Oct 24 09:08 CST 2014
[RELATED]

I looked back at your original post. The car has 200K on it. If it still has the original pump in it then your friend has been running on borrowed time.

From (failing) memory.... Fuel pressure at idle should be in the neighborhood of 36 psi and hold steady there if the throttle isn't touched. If he jabs the throttle (reduced intake vacuum) the pressure should increase to around 42-44 psi. When it's just sitting there idling there is minimal fuel flow through the filter, so it's doubtful the pressure fluctuations can be blamed on that.

As a final verification that the problem isn't related to a bad relay or some other interuption to the electrical power supply, your friend could dig around by the LH trunk hinge and locate the pink pump power wire. There is a disconnect in that area that provides a handy place to tap into the pink wire with a volt meter and see if there are power flucuations that corrolate with the pressure fluctuations. If the power holds at a steady 12v, then it sounds like it's new pump time - what fun!






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