Printable Version of Topic

Click here to view this topic in its original format

914World.com _ 914World Garage _ Fuel pump wireing

Posted by: toon1 Nov 29 2005, 11:39 PM

I am now trying to chase down the wires to relocate the fuel pump. It is a black with red stripe and a brown @ the fuel pump connector. I found a black and red wire @ the connector on the relay board in the motor compartment.

Does the wire go into the car at that point?

Can I ground the - side to the body or do I need to locate the brown wire also?

Is it possible to check if everything works(relay board etc.) without the motor in the car?

Posted by: toon1 Nov 30 2005, 09:33 AM

no takers on this one?

Posted by: SLITS Nov 30 2005, 09:38 AM

First, what year? (fuel pump in front or in engine compartment?)

On a '73...the black w/red trace comes from pin #13 on the relay board in the main harness (14 pin connector). The brown (ground) runs to a body ground connection (along with a few others), but the wire is contained in the main harness.

The fuel pump relay on the relay board has to be activated for it to run with the key on and I believe it is "proofed" by the ECU. You can jump terminals in the relay socket to make it run. I believe it is terminals 30 & 87 on the relay socket****

****Somebody correct me if I picked the wrong ones from the diagram.

Posted by: toon1 Nov 30 2005, 09:43 AM

It's a 73, I am relocating the pump to the front.

Posted by: SLITS Nov 30 2005, 09:58 AM

Here's another way...courtesy of the resident Kraut

http://www.914world.com/bbs2/index.php?act=ST&f=5&t=25954

Posted by: Dave_Darling Nov 30 2005, 03:21 PM

Ground the one pin to any convenent ground--like the chassis nearby.

Run a wire through the center tunnel that connects to the black/red wire at the relay board. Run the wire along the main wiring harness until it gets into the compartment where you want the pump to live, then have it split off from the harness. It can be a bit of a pain running an extra wire along the harness, but it is doable and is probably the cleanest way to do it.

--DD

Posted by: toon1 Nov 30 2005, 08:49 PM

there is a black and red wire running through the tunnel is this a different wire.

I was looking at Andy's post on making the fuel pump run. do the other connections have to be made (alt. and other wire harness) to run the fuel pump? The motor is out of the car.

Posted by: lapuwali Nov 30 2005, 09:26 PM

The fuel pump is switched on by the fuel pump relay on the relay board. The ECU does the switching through that relay. There is no "fuel pump wire" running through the tunnel. The fuel pump power wire only runs from the relay board to the fuel pump itself.

If you're moving the pump to the front, there are a couple of things you can do. The simplest is to get an inline fuse holder with 7-8 amp fuse and some 18g black wire, and connect it to switched power directly, which will be one of the black wires at the fusebox. Black is generally "switched power" anywhere on the 914. If you don't want to stress the ignition switch, add a relay. There are a few posts you can search for here on how to do this. If you do this, the fuel pump will be on all the time the ignition is on.

The other thing you can do is run the red/black wire off the relay board all the way up front through the tunnel, so the ECU and the stock fuel pump relay continue to power the pump.

You can also just not move the pump. The position on the rear firewall generally keeps it out of the area where the HEs dump their air, which was what caused the overheating and vapor lock problems in the first place.

Posted by: toon1 Dec 1 2005, 12:26 AM

thank's for the help guy's. I think I will leave it in the front andrun a seperate wire. Lot's of good info, thank's again.