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Join Date: Jul 2005
Location: St. George Utah
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89 930 front fuel pump question

Does anyone have the wiring diagram handy and can tell me where the activation originates going to the relay. Front fuel pump does not come on with ignition, new pump, and works when I jump from pin 30 to pin 87. Thanks for any advice anyone can supply.
Old 06-09-2007, 09:47 AM
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The pumps will not come on until the CIS metering plate moves. IOW engine is cranking.
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1981 UK 930. G50/01 shortened, 964 3.8RS Fibreglass Body Kit, 18" Alloys 8.5" F & 10" R, 225's F & 285's R, Special Colour Metallic Blue Paint, FIA Sparco Evo's, A/C and Air Pump removed, Electronic Boost Controller, GHL Headers, Tial46 WG.
Fitting - New service kit.
Needs Fitting - Innovate XD-16 Kit, Kokeln IC. Stephen's K27 HFS, EVO Intake Assy & his Modded USA Fuel Head.

1983 UK 911 3.2 Carrera Sport Coupe. Black, Black Leather with Red Piping, Black Alloy Gear Knob, K&N Air Filter Element, Turbo Tie rods.
Needs Fitting - K&N CO Sensor, Round A/F Dial Gauge, Factory Short Shift Kit.

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Old 06-09-2007, 12:28 PM
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Thanks Nathan for responding, when the engine was running, the rear fuel pump was really straining, brand new pumps, when I jumped pin 30 to 87 on the front pump, the rear fuel pump sounded normal and better engine performance. I have made an adjustment to my air fuel ratio and now they both seem to be working fine, must have been a bit out of adjustment I guess. Does this sound right to you?
Old 06-09-2007, 03:57 PM
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Not sure. You might be better to replace the relays for each pump. From what I have read the overboost relay in the rear of the car cuts both pumps so it shouldn't be that.
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1981 UK 930. G50/01 shortened, 964 3.8RS Fibreglass Body Kit, 18" Alloys 8.5" F & 10" R, 225's F & 285's R, Special Colour Metallic Blue Paint, FIA Sparco Evo's, A/C and Air Pump removed, Electronic Boost Controller, GHL Headers, Tial46 WG.
Fitting - New service kit.
Needs Fitting - Innovate XD-16 Kit, Kokeln IC. Stephen's K27 HFS, EVO Intake Assy & his Modded USA Fuel Head.

1983 UK 911 3.2 Carrera Sport Coupe. Black, Black Leather with Red Piping, Black Alloy Gear Knob, K&N Air Filter Element, Turbo Tie rods.
Needs Fitting - K&N CO Sensor, Round A/F Dial Gauge, Factory Short Shift Kit.

http://www.danasoft.com/sig/Iamnotanumber.jpg
Old 06-10-2007, 03:12 AM
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