fuel pump
Moderator: martauto
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321gazza
- E30 Zone Regular
- Posts: 342
- Joined: Fri Sep 07, 2007 11:00 pm
At what pressure does my intank fuel pump run at in psi please, its a 1992 318i.
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Billwill
- E30 Zone Regular
- Posts: 363
- Joined: Sun Jun 26, 2011 11:00 pm
- Location: South Africa
According to Haynes it is 3.0 bars which converts to 45.5 psi according to Google convert.321gazza wrote:At what pressure does my intank fuel pump run at in psi please, its a 1992 318i.
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Brianmoooore
- E30 Zone Team Member
- Posts: 49360
- Joined: Mon Jan 10, 2005 11:00 pm
The pressure it runs at is set by the fuel pressure regulator on the fuel rail above the inlet manifold on the engine. The pressure is marked on the regulator.
Note that this pressure is relative to that in the inlet manifold, so will only be three bar when the throttle is wide open. At part and closed throttle there will be a partial vacuum in the inlet manifold, and this will reduce the fuel pressure by the same amount.
Note that this pressure is relative to that in the inlet manifold, so will only be three bar when the throttle is wide open. At part and closed throttle there will be a partial vacuum in the inlet manifold, and this will reduce the fuel pressure by the same amount.
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321gazza
- E30 Zone Regular
- Posts: 342
- Joined: Fri Sep 07, 2007 11:00 pm
Running a swirl pot and will be using the main pump to feed the pot, have been advised the that would be ok but still would like to know the intank fuel pressure that gonna feed my swirlpot.
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Brianmoooore
- E30 Zone Team Member
- Posts: 49360
- Joined: Mon Jan 10, 2005 11:00 pm
Pressure depends on the flow rate. High flow = low pressure, and vice versa.