What are the components of a XJ6 fuel pump?

I believe it to be accurate for all Series III XJ6 cars but some of the earliest cars may be different. There are three main components to the system: the trunk-mounted, constant pressure electric fuel pump, a control relay, and a voltage directing diode pack.

How does the fuel pump work on a JAG?

There is an air flap inside the AFM which, when moved by engine vacuum as the engine starts, closes a micro-switch inside the AFM and powers up the fuel pump circuit. With the key “on”, check for voltage into the AFM at the brown/slate wire.

Where does the jumper wire go on a fuel pump?

Remove the connector socket from the fuel pump relay. Determine whcih connector/terminal cavity is associated with the white/green wire (this wire goes directly to the fuel pump). Attach your jumper wire to a known good 12 volt source (the battery “+” post makes good sense) and touch it to the terminal of the white/green wire.

Where is the fuel pump located on a twelve cylinder car?

Twelve cylinder cars, by the way, are wired differently. The diode pack is mounted on the firewall and is easily identified by it’s all-red color. The fuel pump relay is normally mounted right next to the diode pack but I’ve seen a couple of cars where the pump relay and the main relay have been flip-flopped.

How do you remove the fuel tank from a Jaguar XJ6?

When this happens, drain the fuel tank and remove it from your XJ6 so that you can clean the tank properly and restore it to full function. Disconnect the negative terminal of the battery and set it aside. Use a car jack to lift up your vehicle. Place jack stands under each wheel to ensure safety.

Where is the drain plug on a Jaguar XJ6?

Place jack stands under each wheel to ensure safety. Remove the fuel-filling cap to release any pressure in the fuel tank. This is the cap that you remove when you are putting gas into your vehicle. Locate the drain plug on the bottom of the fuel tank.

What kind of engine does a Jaguar XJ6 have?

Models covered Jaguar XJ6 models with 3.2 litre (3239 cc), 3.6 litre (3590 cc) & 4.0 litre (3980 cc) six-cylinder in-line dohc petrol engines and automatic transmission

Where is the transmission on a Jaguar XJ6?

Transmissions are a four-speed automatic equipped with a lock-up torque converter. The transmission is mounted to the back of the engine, and power is transmitted to the fully independent rear axle through a two-piece propshaft.

Why does my Jaguar XJ6 not start up?

About half of the time, the reason why the Jaguar XJ6 will not start or quits running is because of the two main electrical problems that I described above. The other cause of the XJ6 not starting or quits running is the fuel system. Mostly, it is the fuel pump being killed by rust flakes from the two fuel tanks.

How to troubleshoot the fuel pump on a Jaguar?

Remove the relay plug-in socket and determine which terminal cavity corresponds to the white/green wire. This wire goes right to the fuel pump. Using your jumper wire apply 12 volts to this wire for just a moment (you are bypassing the somewhat tricky control portion of this circuit).

Why is my fuel pump leaking after 50 miles?

After the initial mile on the highway, the car may not exhibit any more problems for 50 or more miles. This is not indicative that the possible problem with the fuel pump has been corrected. During the start test, a loose engine belt could also prevent the car engine from starting.

How to troubleshoot a no start fuel pump?

Using your jumper wire apply 12 volts to this wire for just a moment (you are bypassing the somewhat tricky control portion of this circuit). If the fuel pump is operational you’ll get an immediate and powerful surge of fuel through the hose.

Where is the fuel supply hose on a Jaguar?

Disconnect fuel supply hose at the fuel rail (at the rear of later “straight rail” cars and at the bottom of the early “loop style” rails). Some fuel may spill, have rags and container handy. A properly operating pump will produce about 34 PSI so, again, be ready ! Position fuel hose so fuel will flow into the container.

Where is the fuel pump on a 1978 Jaguar XJ6?

On the 1978 XJ6 there is one fuel pump in the bottom of the trunk, on earlier versions, there used to be two fuel pumps, one for each tank. There is a switch on the dashboard, where you select which tank you want to pump from, the left tank, or the right tank.

The local mechanic Donnie Taylor, had done several engine swaps, where he replaced the Jaguar engine with either a Chevrolet Monte Carlo engine, or a Corvette engine. My father told the mechanic Donnie Taylor, to look for a good used Jaguar XJ6 for sale, to go and perform an inspection, and to bring it back if it was a good car.

How old was my father when he bought a Jaguar XJ6?

I could not believe it when my father bought a 1983 XJ6L Vanden Plas in about 1992. I was about 23 years old, and a mechanical engineering student at the University of Florida.

Where is the critical relay on a Jaguar XJ6?

A critical relay is in the RH under-bonnet fusebox. This one switches the supply to the starter relay and ignition coils (via fuse 12), also the oxygen sensor heaters (via fuse 14). Whilst you’re in that fuse box, check the condition of fuses 6, 11, 12, 14. These carry supply current to various parts of the engine-management system.

Where are the fuses on a Jaguar XJ6?

If your car’s accessories are shutting off on their own inspect the car’s fuses and replace blown ones. Replacing a fuse is much cheaper than paying for new equipment or repairs that you don’t need so take a few minutes to find your fuse boxes. Your owner’s manual can help you locate them. Jaguar XJ6 Series 3 1. Glass fuse https://amzn.to/2GeEANS

What kind of transmission does a Jaguar XJ6 have?

Jaguar XJ6 Service and Repair Manual 3261 Jaguar XJ6 Models covered Jaguar XJ6 models with 3.2 litre (3239 cc), 3.6 litre (3590 cc) & 4.0 litre (3980 cc) six-cylinder in-line dohc petrol engines and automatic transmission

Where are the return valves on the XJ6?

The return valves are located in the rear wheel wells behind semi-rectangular sheet metal covers. Turn the key “on”, select the right tank, and using your test light check for voltage at the white/purple wire for each valve. Your light should show 12 volts at all three valves. Now, select the left tank and make the same voltage tests.

What to do if your Jaguar XJ6 won’t start?

If your XJ6 or XJ12 won’t start, grab your voltmeter and follow this checklist. Covers checking spark plugs, coil, wires and distributor cap, ballast resistor, amplifier and distributor pick-up, fuel supply, fuel pump and relay, air flow meter, fuel injectors and ECU.

How to start a fuel pump in a Jaguar?

10) Remove the air duct from the front of the Air Flow Meter (AFM). With the key “on”, move the air flap which is inside the housing of the AFM. This movement closes a switch inside the AFM and powers up the fuel pump circuit. You should get fuel in your container or a 34 PSI reading on your gauge.

How can you tell if your fuel pump is failing?

If you ignore all of the other warning signs of a failing fuel pump, it will eventually fail completely. Once your fuel pump has finally given up the ghost, no fuel will reach your engine. You may hear your spark plugs firing when you try to start your car, but without fuel, the engine won’t be able to turn over.

What are the components of a fuel pump?

There are three main components to the system: the trunk-mounted, constant pressure electric fuel pump, a control relay, and a voltage directing diode pack. The system is so designed that the pump will operate when the starter motor is engaged and when the motor is actually running.

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