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r_towle's Avatar
 
Join Date: Mar 2002
Location: Dunstable, MA
Posts: 657
Fuel pressure

1984 3.2 Carrera

When does the pump build pressure at start time?

Turn key on, does pump run and build pressure?

Or

Turn key to start, pump runs and builds pressure?

I’m hunting what I’m hoping is just a dirty system.

My fuel sender gauge is no longer going all the way down.

I’m replacing
Fuel strainer screen
Fuel filter
Fuel level sender.

I’m wondering if I should replace the 40 year old fuel pump while I happen to have the fuel tank drained.

Old 07-19-2023, 04:33 PM
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Re gauge not going all the way down: Probably just crud in the sender. Does the Fuel Low light come on?
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1973.5 911T with RoW 1980 SC CIS stroked to 3.2, 10:1 Mahle Sport p/c's, TBC exhaust ports, M1 cams, SSI's. RSR bushings & adj spring plates, Koni Sports, 21/26mm T-bars, stock swaybars, 16x7 Fuchs w Michelin Pilot Sport A/S 3+, 205/55-16 at all 4 corners.

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Old 07-19-2023, 08:01 PM
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It did come on….but I’m not certain it goes down that low anymore. I bought a new one.
Old 07-19-2023, 08:09 PM
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Pump starts running only when cranking.
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Gilles

RoW 88 Carrera coupé
Old 07-19-2023, 11:52 PM
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Quote:
Originally Posted by wazzz View Post
Pump starts running only when cranking.
Thank you.
I’m hopeful it’s just screen and filter and sender. I might need a check valve….and fuel lines, we shall see tomorrow.

Old 07-20-2023, 04:09 PM
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