1999 4.0 Jaguar XJ8 No Start – Fuel Pump Location

12:33 pm Consumer, How To Auto Repair, Tech/Mechanic

1999 4.0 Jaguar XJ8

Summary: Jaguar XJ-8 no start problem. One of the most common causes of a no start condition in one of these Jags is a bad fuel pump. Where’s the fuel pump you ask? See the entire repair blog, included is a picture of the fuel tank. The pump is located inside.


One quick preliminary check is to spray a little starting fluid in the air intake hose and then crank the engine over. If the car momentarily starts then chances are good that the fuel pump is NOT working.  Another way to quickly check the fuel pump, is to have someone listen for the hum of the fuel pump in the trunk area when the key is first turned to the on position. The wiring can be back-probed to see if voltage is actually getting back to the pump as well.  To check further a pressure gauge can be used to see if there’s sufficient fuel pressure. If the pump is working, there could be a different problem… like a bad crank or cam sensor. Use a code reader or scan tool to check for trouble codes – see if there’s anything the car’s computer has recorded as a possible problem. A stored code may not set for the fuel pump. Data can also be viewed to see if the cam and crank sensors are showing the expected revolutions during cranking.   

Fuel pump on the 99 XJ8 is in the fuel pump.

Don’t be fooled into thinking this fuel pump is an easy one to change. It is located inside the gas tank in the trunk. The tank looks easy, but the fuel lines are really the sticking point. The lines enter the tank from a very small access hole above the rear differential (under the car). The metal lines have quick disconnects that must be removed prior to pulling the tank. Hard to see and harder to reach! 

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2 Responses
  1. dave :

    Date: May 15, 2012 @ 12:04 pm

    I am going to remove my tank and replace the fuel pump in my 98 jag xj8. Are there any secrets I need to know before I start?

  2. dennisb - Auto Tool Sales :

    Date: May 15, 2012 @ 12:33 pm

    Dave, the fuel line needs to be released before removing the tank. Look up when the car is raised towards the rear of the car. This is VERY difficult to reach. If you cannot disconnect that line, do yourself a favor and consider paying someone else to change the pump. Good Luck.

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