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So is the ecu sending the volts to the pumps for the full pre-start time as normal. Do both relays cut out?

Try disconnecting the fuel pumps and see if the relays cut out.

Dean
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Dean
911 SC turbo, 3.0L 930 motor, G50, 930 brakes, DTA EFI, 352 RWHP DynoDynamic dyno,
Old 05-16-2007, 05:45 PM
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I'll have to try that tomorrow dean... Sounds like a good idea...
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Brian Keith Smith
Competition Custom Paint
1983 930
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TEC3 EFI Conversion on 1983 930
Old 05-16-2007, 05:49 PM
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I went home at lunch and checked, and the ECU does trip the wire for the relay for approx 15 seconds.

I didn't have the relay plugged in, because I've disassembled some stuff, but the wire is doing its thing... So the ECU is telling the Relay to open for the designated time...

I only had about 5 mins so that's all I had a chance to look at during lunch...

Brian
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Brian Keith Smith
Competition Custom Paint
1983 930
My Track Videos
TEC3 EFI Conversion on 1983 930

Last edited by briankeithsmith; 05-17-2007 at 11:08 AM..
Old 05-17-2007, 11:05 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #23 (permalink)
930s rule the wasteland
 
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check your main grounds , high resistance across a ground will heat things up fast . if you had the motor out check the braided main ground at the trans. you can also check the ground side of the relay with a ohm meter (key off of course whenever checking ohms). pin out the ground side of the relay and put the other side to ground on the body or motor clean metal not painted. you should have low ohms 0 to 5 ohms not 50 or open (infinint)check you r connections at the battery also if you unhooked to remove the motor. good luck ,if you have any ?s hit me up.
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1980 930 Turbo
1993 Corrado
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1984 944
2001 VW golf TDI
Old 05-17-2007, 02:55 PM
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Thanks h20.....
I swapped Relays with a brand new relay tonight, and the relay came on for 15 seconds like its suppose to, then I fired the car up...

But it is getting a little warm....

So I'm going to double check all of the stuff everyone here has mentioned.

Also, FYI - the brand new rear fuel pump I bought reads 1.3 ohms. Yet the spare used pump I have in the trailer (not on the car) reads 26.5ohms...

Not sure what it means, other than there is more resistance on the used one.... I haven't checked the one on the car yet....

Brian
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Brian Keith Smith
Competition Custom Paint
1983 930
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TEC3 EFI Conversion on 1983 930
Old 05-17-2007, 07:20 PM
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Brian, the pumps run in fuel, maybe this alters the resistance. I would compare it to the one on the car. 1.3 ohms sounds alot to me though.

What Amperage are the relays rated at that you are using ?
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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 05-18-2007, 02:17 PM
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930s rule the wasteland
 
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no its not gonna alter the ohms , the fuel will lubricate the pump but will not alter ohms
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1980 930 Turbo
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1983 944
1984 944
2001 VW golf TDI
Old 05-18-2007, 02:20 PM
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Have you tested them with a meter wet and dry ?
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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 05-18-2007, 03:11 PM
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Fuses are 30 amp, each fuel pump on its own fuse...

Quote:
Have you tested them with a meter wet and dry ?
Not sure if this is a question for me, but no, have not tested them wet/dry....

Brian
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Competition Custom Paint
1983 930
My Track Videos
TEC3 EFI Conversion on 1983 930
Old 05-18-2007, 07:46 PM
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Brian I would like to know what A (amperage) the relays are. It is possible that the relays you are using are not of a high enough rating. Just don't want to overlook something as simple as that.

As for the wet and dry, my question was to h20.
I feel that 1.3 ohms seems a lot of power to consume to me, but I am no auto electrician. This can be worked out using maths though. I personally would just compare the front to the rear ohms reading from your car so we know that one pump hasn't screwed up.
The reason I asked h20 if he has ever tested them wet or dry is because I know that the electrics of the pump are actually immersed in fuel. I know that dirty water conducts way more electricty than fresh air but I have no idea about petroleum. I also have no idea if pumps will read differently when they are dry or when they are full of any liquid. Would love to know!
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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

Last edited by NathanUK; 05-19-2007 at 12:18 AM..
Old 05-19-2007, 12:09 AM
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relays are 30Amp
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Brian Keith Smith
Competition Custom Paint
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My Track Videos
TEC3 EFI Conversion on 1983 930
Old 05-19-2007, 03:18 AM
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Keep us updated. This is my next project. I have strange electrical gremlins between my ECU, relays, and fuel pumps. I am keeping a close watch on this thread.
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Crashed: Silver 1992 Turbo S2
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Old 05-19-2007, 04:43 AM
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I am no electrical expert. I think it is ok if relays are a little warm. But I could be wrong.

So it sounds like you fixed your car?

The way I fix electrical problems is to eliminate things and then you can narrow down the problem. If the problem is intermitent then it is much harder to find the problem.
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911 SC turbo, 3.0L 930 motor, G50, 930 brakes, DTA EFI, 352 RWHP DynoDynamic dyno,
Old 05-19-2007, 05:41 AM
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The relays will get a little warm due to the energy being consumed keeping the relay contacts forced together.
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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 05-19-2007, 09:29 AM
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According to my maths and ohms law your fuel pump is only drawing 10Amps. So I would say the next stage is to check the other pump and if that is similair then you will have to do a live current test.

http://www.the12volt.com/ohm/ohmslaw.asp

13/1.3=10
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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 05-19-2007, 09:36 AM
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