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Registered
Join Date: Sep 2013
Location: NJ
Posts: 48
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loss of rest pressure
Rest pressure drops to 0 within two minutes of shutdown.
New front fuel pump with new check valve. sp=95psi, ccp=41psi, wcp64psi in seven minutes. I have eliminated the injectors as a problem and have clamped the fuel line to the cs valve If the fuel accumulator was failing, will the sp drop also? What do I try next? |
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06-18-2017, 10:17 AM
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Crotchety Old Bastard
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Fuel accumulator is the likely culprit. You should be having hot start issues as well.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds '78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8 |
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06-19-2017, 03:40 AM
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Registered
Join Date: Sep 2013
Location: NJ
Posts: 48
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hot start is the problem.
If the accumulator diaphragm is leaking, will the system pressure be low due to the fuel leaking into the return line? |
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06-19-2017, 06:16 AM
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Registered
Join Date: Oct 2006
Location: MYR S.C.
Posts: 17,321
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unless it is a very very large leak the FP's can keep up with it as I have never heard of anyone confirming a drop in system pressure due to a leaking FA.
if you remove the return from the FA there should not be any fuel coming out of the bottom of the FA.
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86 930 94kmiles [_  _] RUNNING:[__] NOT RUNNING: ____77 911S widebody: SOLD88 BMW 325is 200K+ SOLD 03 BMW 330CI 220K:: [_ _] RUNNING: [__] NOT RUNNING:01 suburban 330K:: [_ _] RUNNING: [__] NOT RUNNING:RACE CAR:: sold |
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06-19-2017, 09:31 AM
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Registered
Join Date: Sep 2013
Location: NJ
Posts: 48
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If you remove the return line from the bottom of the FA, wouldn't you expect to see some fuel from the return line?
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06-19-2017, 01:23 PM
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78 Porsche 911SC 3.0L, 3.3Turbo soon. 
