Where is the fuel pump relay located on a Porsche 944?

On the older 944s, the relay is known as the fuel pump relay and is located on the fuse panel under the dash on the driver side. On later 944s and 951s, the relay is located in the fuse /relay panel in the rear left side of the engine compartment close to the windshield and A-pillar. These relays are prone to failure, a lot of failures.

Why is my Porsche 944 Turbo DME relay not picking up?

The reading should be almost zero or between 0.1 and 0.3 ohms Connect the positive side of the power supply to terminal 86 (blue arrow) first and then the negative side to terminal 85 (green arrow). Because of the diode in the circuit, if you install them the other way, the electricity will not flow and the relay will not pick up.

What are the numbers on a fuel pump?

The schematics are as follows: 87b (4)- power to fuel pump, 85b (9)-ground from DME to pick up fuel pump, 87 (8)-power to DME and fuel injectors, 85 (1)- ground via DME, 86 (3)-ignition switch and 30 (2) is battery or power. The terminals are numbered on the bottom. Place your multi-meter in the position to test ohms or resistance.

How do you connect a relay to a power supply?

Connect the positive side of the power supply to terminal 86 (blue arrow) first and then the negative side to terminal 85 (green arrow). Because of the diode in the circuit, if you install them the other way, the electricity will not flow and the relay will not pick up.

Is the DME relay on a Porsche 944 good?

If you are going to drive a 944 or 951, invest in a couple of extra DME relays and always carry a spare. There is even room in the fuse box for the spare. With a proper functioning relay, buy a spare and swap it out with the good relay. If the car starts and runs with no problems, then you know the new relay is good.

When to order a new Porsche 911 fuel pump?

Click here to order! Porsche 911 engines need a steady supply of fuel at the correct pressure for good performance. If the hum from your fuel pump is getting louder, it may be a sign of imminent failure. When you order your new fuel pump, be sure to get two new copper sealing rings.

How can I tell if my Porsche DME relay is faulty?

Now connect your power supply to terminals 85 (negative) and 86 (positive) and check that there is no resistance (or again no more than 0.2 ohms) between terminals 30 and 87. If you see a higher resistance between the terminals when you make these two powered tests then you can assume that the relay is faulty.

When did the Porsche 944 air conditioner come out?

Year of production: 1976, 1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991 Models with an air conditioner have two additional relays underneath the instrument panel next to the center console.

Why is the fuel pump not running on my 964?

You will only hear or feel the pump run after the key has energized the starter solenoid, then it will run a few seconds and turn off unless the engine runs. Check the fuse, I forget the # but it is about 5 from the bottom on the side closest to you, there is a little yellow tool to remove the fuse in the fusebox, and a few spares there as well.

What to do if your fuel pump won’t start?

They get stuck if left sitting, sometimes you can free them up but most often you just need to replace it (be happy you don’t have an MFI car). You will only hear or feel the pump run after the key has energized the starter solenoid, then it will run a few seconds and turn off unless the engine runs.

What to do if your Porsche 911 engine wont start?

2. Remove the air cleaner cover and air filter, and spray some fuel into the intake. You will have to hold open the little “door” inside there with something. If it starts briefy then dies you probably have a fuel problem. 3. You can jumper a hot wire to the fuel pump and listen to it whir to prove that it’s working.

What are the relays on a Porsche 944?

The relay on the later 994s actually has two relays within it, one that powers the DME and KLR on the 951 and a separate relay that powers the fuel pump and heater for the O2 sensor.

Where are the DME fuses on a Porsche 911?

All DME-related fuses are up front, but there are three fuses under the plastic cover at the left rear side of the engine compartment. 9. If you have one available, swap in a known working DME computer from a 911 friend. Be careful that you have the right production year and part number because there are differences in the pin mappings.

Where do you replace the fuel pump relay?

If it is a DME problem, replace the DME relay, which sends power to the fuel pump. This is another one of those parts that is known to be flaky. The relay is under the driver’s seat next to the DME computer. It’s highly recommended to carry a spare DME relay anyways (a $40 part), so go ahead and get an extra just in case. 6.

What is the part number for the Porsche DME relay?

The DME relay in 944s, 924Ss, 968s and 964s originally bore the part number 944.615.227.00. This was updated for the 993, and carried part number 993.615.227.00. The newer part is a direct replacement for the 944 unit, and although it looks much the same it’s claimed by Porsche to be more reliable.

Where does the power come from in a DME relay?

Then when the the starter motor is cranked, the ECU activates the second relay in the DME relay and power is supplied to the fuel pump for as long as the engine is running. In the other cars power comes from the ignition switch direct to the DME relay.

Where are the fuses located on a Porsche 924?

Fuse box diagram (fuse layout), location, and assignment of fuses and relays Porsche 924, 924S, 944 (1976, 1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991). In order to prevent damage to the electrical system due to short circuits and overloads, fuses protect the individual circuits.

Where is the DME relay located on a 1985 944?

Introduction and Technical Information The DME relay which is used on 1985.5 and newer 944s is essentially the same as the fuel pump relay used on early 944s. The fuel pump relay on the early cars is located on the fuse / relay panel under the dash on the driver’s side (LHD). The DME relay actually has two relays / contacts.

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