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86porsche 86porsche is offline
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Join Date: Dec 2007
Location: Ireland
Posts: 71
Fuel pressure readings

Hi Lads, my car is an 86 16v euro spec model.

I'm having an issue with my car hard starting, after I take it for a run and letting it cool down for 10min or more It takes a good 10 secs to start again and I have to pump the pedal a few times, starts first time every-time other then that.

So I hooked up a gauge to the fuel test point and got these readings.

Started her up and the gauge read 6bar about 90psi it was jumping around abit.

shut it down read 2.5 bar about 36psi

20 min later 2.0bar about 30psi

1hr later 1bar 15psi

I also did the test while bridging the fuel pump.

Got 6bar again 90psi and held pressure from 2.5bar to 1.5 for 20mins 0 after 30min

ran the fuel pump also to check output got 1600cc for 30 sec.

can someone please tell me are these reading ok? Need to fix this problem so any other ideas are appreciated?
Old 08-08-2009, 11:21 AM
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