It sounds like my fuel pump is going to give up soon. It just became loud today. I was looking on Ebay and there seems to be a few different ones with price ranges from about $75 to $150. Since it is rather arduous to remove the tank, I would like to buy a pump that won’t break down soon. Does anyone have any suggestions?
Almost all the XJ40 in-tank pumps are made by Walbro, so no matter what brand you buy, Airtex, Walbro, Bosch etc, you will be buying a re-boxed Walbro, (regardless of price) so buy the cheapest one you can.
Rock Auto has a selection, with one for as little as $18 BTW
If you look at the picture of the Airtex on RockAuto, you can see part of the word “Walb…” in the enlargement.
I fitted an Airtex “Walbro” several years ago with no complaints - at that time it was the cheapest - I think I paid around $20 for it.
John - The in-tank pumps sit in a plastic “can” that does not come with a new pump.The pump is just that, a high capacity rotary vane pump.
It has nothing to do with the sender unit, that is an independent device that is located at the back of the tank and uses a conventional float/rheostat system.
Larry thanks for your response. I must be thinking of a later car or perhaps a Range Rover where the pump module included the sending unit. I think the 1991 and later XJ40 in-tank pumps were adopted to avoid the fuel pump vapor lock situation in extreme hot weather that my 1990 car has suffered from a few times.
I replaced the fuel filter about 2 years ago so I don’t think that’s the problem, but guess what? The noise is gone. The pump is quiet again. I purchased a bottle of marvel mystery oil and poured 8 ounces into the gas tank. I’m beginning to wonder if the detergent separated from the fuel since this happened after a fill up. We are going through an end of summer heatwave right now. I’m not sure if that has something to do with the problem.
It’s been over a week now and there are no further symptoms. I am now purchasing fuel from a different gas station instead of the convenience store one. I’ll provide updates every now and then to see if the problem was actually the fuel.