Thread: Fuel pressure
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Old 04-09-2010, 07:28 AM   #7
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Join Date: Jan 2006
Location: Glen Allen, ON
Posts: 314
The fuel pressure spec is not 3.3-3.8 Bar.
On the early cars, before the introduction of the returnless fuel systems, there are two measurements a static measurement with no engine vacuum (engine not running, fuel pump activated) that is 3.8 +/- 0.2 Bar and the second measurement with the engine idling (vacuum to the FPR) is 3.3 Bar +/- 0.2 Bar. These measurements test both the pump and the regulator.


Originally Posted by paulv
The manual info on Cannell (although it's dated) shows 3.3-3.8 bar (+/- 0.2 bar) for fuel pressure at the rail and fuel flow should be around 850 cubic cm in 30 secs.

Also, the fuel rail caps are not reusable and need to be replaced with new ones.

Current Cars:
1989 911 Targa
1984 944 Original Owner
1971 911T
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