fuel pump

Martinn · 07-30-2001, 05:02 PM

I just recently aquired a 73 914 2L. It was not running. The fuel pump was moved to the front trunk. When the key is turned on, the fuel pump runs continously. it does not stop after 2 seconds. I believe it was wired to a keyed circuit. Where in the engine compartment was the fuel pump originally located? I want to locate the power line that went to it.
Thanks

paulhagedorn · 07-30-2001, 05:17 PM

The fuel pump was originally located under the engine shelf on the right side. The wires that go to it came through the engine shroud, I think. Mine was wired exactly like yours, and I did the same thing. Be looking for two wires together, one is a brown, the ground wire, and I can't remember what the other color is...sorry. Someone else will answer if I don't get to checking my car soon.

Paul

Dave at Pelican Parts · Dave at Pelican Parts's Garage

Black with a red stripe. On my 74, the wires come down through the engine shelf up in that corner. Tough to find with the battery tray and the ECU and such in the way. The pump itself lives up above where the fat heater hose connects to the body.

--DD

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Pelican Parts 914 Tech Support

A few pics of my car: http://www.pelicanparts.com/gallery/Dave_Darling

paulhagedorn · 07-31-2001, 07:39 AM

Thanks, Dave. Another thing you are probably wondering is what is an easy way of routing the wire up to the fuel pump....well, the way I did it was attach a wire to the existing wire, then push it through the rubber grommit in the fire wall...the one that has all the other wires that go to the front of the car. Easy way to do this is to use a coat hanger. Tape the wire to the coat hanger and bend the coat hanger so it is almost straight. Push it through and go to the other side and you will be able to pull the wire through. Then, I took the wire and ran it along with the other wires in the center tunnel. Depending on if your pump is in the front trunk or beneath the fuel tank next to the steering rack, you will have a couple of options on how to get the wire to the pump.

Paul

[This message has been edited by paulhagedorn (edited 07-31-2001).]

Roland Kunz · 07-31-2001, 10:56 AM

Hello

Porsche moved the pump forward in 1974 as the position forced vapor lock. The pump sits in a hot corner and the heatvent blows hot air into that area too. Now good heaters maken someting like 100°C heat increase at the flap. If your fresh air has 40°C the pump sees 140°C hot air.

So your pump seems to run via any ignition circuit up there. The original wires go on the old position.

best would be too remove the pin ( 13 ? ) for that wire from the connector and interchange it with a free wire from the mainwireloom, one most cars are one or two unused wires. The pin beside 13 is 11 and brown / yellow. This cable is used to run the sportomatic tooogle contact switch and you will find the other end in the wireloom beside the shifter ( maybe binded back ).

You also will find a green wire for the oiltempindicator but this is not on the 14 Pin connector and the other end is behind the left instrument.

Attention the wirelooms changed four times and the 2,0 uses the green wire for the oiltemperature instrument with 73 the sportomatic cable was removed and the pins get mixed up new.

To avoid troubles you run the wire to a other piggyback fused relay beside the fuelpump and hookk that up to a ignition power source. I little switch in the line makes a theft prevention.

Grüsse

Martinn · 07-31-2001, 05:01 PM

Thanks everyone for your replies.
it gives me a place to work from.
Can't wait to get this beast running again

Martinn · 08-01-2001, 04:59 PM

I hate to be a pest but does the red-black wire for the fuel pump come from the computer or the relay board. Don't seem to find it.
Thanks

bowlsby · 08-01-2001, 05:02 PM

Not from the ECU, at least not in those colors.

Must change color at the relay board.

Roland Kunz · 08-02-2001, 02:16 AM

Hello

Wireloom for Pump goes into main wireloom.

Ground is on the main ground beside rear electric board.

The plus side comes from the relay board and is to find on the 14 pin connector afront.

Let the clamp over the wireloom and remove the upper connector cover and you will see all colors. The fuelpumpwire is very close to the wall.

Grüsse

[This message has been edited by Roland Kunz (edited 08-02-2001).]

DDS · 08-03-2001, 06:27 AM

Roland ist eine Gott.

Danke.

Grusse.

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-- Dave
Pics of my '73 project here: http://members.tripod.com/mike4g/dds73_b4pics.htm