My 95 XJR have started to act bad the last weeks, and after crosschanged coils and sparkplugs, it's possibly clogged fuelfilter and warn out fuelpump(s). It stops without warning, and after that it's very hard to start, and runs very rough.
Since one cylinder is not responding correctly, it's possibly bad injectors too. I took out the fuel filter, and it had some rust particles inside
My quetions is: I heard that it's 2 fuelpumps in the XJR.
Are they both inside the tank, as I have heard, and are they the same pumps as in XJ6.
Chat GPT says that it's one low pressure pump in the tank, and one high pressure pump outside the tank.
On Rock Auto it's only one kind of pump for sale, and those are for inside the tank.
What is the correct pumps for my car?

 

Hallucination. This is not direct injection. The two pumps are in-tank. They are the same, JLM12204, originally supplied by Nippondenso.
From Service Manual: "The second fuel pump for the supercharged engine operates only in the higher speed range, switching on at 4000rpm and off at 3200rpm."

 

Thank you very much. That helps a lot. Chat GPT is not always reliable.

 

A way to improve the # 1 pump performance below the 4000 rpm # 2 pump kick in is to jumper the # 1 fuel pump relay socket between the sockets 3 ( battery hot ) and 5 ( to the pump ) , this will directly power the pump and will drain your battery with keys in your pocket as hot at all times , blade type jumper wire ends recommended for best current flow






As a fuel pump gives out it will pit / burn the power contacts inside the relay ( you can swap the relay )

the connector on the pumps motor will also start aching the sockets as it gives out

With the 2 pumps I remember someone way back mentioning that the ECU noticing if the engine does not start the ECU will switch using the second pump as a automatic feature , you can remove the # 1 fuel pump relay and see if it will automaticaly do this

There is also the secret fuse ( 5 amp ) that is the control power to close the fuel pump relays that the fuse has to be powered by the relay in the corner of the fuse box that can be intermittent ( relay swapping option with the left engine bay fuse box relay , only runs car horns )

Notice the BT4 connector in pic




How this relay in the fuse box corners closes is the ignition switch provides a ground path through ignition switch connector pin 5 to car frame ground ( can get disturbed by work in dash area )

Fluids also can get in ignition switch connector corroding causing an underperforming fuse box relay in corner

The ignition switch can easily be replaced ( if it gets to that ) leaving the key barrel installed on car so no new key needed fortunately

 

Thanks for great information.