If your car is eight to ten years old, the fuel hoses on the fuel rail will be cracked and worn. Replace then with 5/16 inch fuel injection hose. Numerous engine fires have been caused by this fault. The Jag engine bay is too hot and degrades the fuel hose.

If your car suffers from intermittent stalling and starting problems check the fuel filter in the fuel sump. This filter gets blocked due to a debris build up over time. I hate messing will fuel and vapor but I conducted this job.

The fuel cooler will only work if the air conditioning is in good working order. If the owner lives in a hot climate, the fuel cooler may be required to prevent vapor lock problems. I live in Denver, one of my cars does not have air conditioning and at least up until now I have not suffered vapor lock problems.

My Jaguars are Hess convertibles. These cars have deficient fuel vent systems. One of the cars would always smell of fuel so finally I decided to remove the fuel tank. After pressure testing I determined the upper surface was cracked. This was caused by the poor design of the tank and vent system. Ref more details at the Hess Fuel Page

A large subject, but the owner should at least check the fuel vapor recall mod was installed on applicable cars. For more details on Hess fuel venting problems ref xxxx.

If the belts are cracked replace them all. There are four belts ....don't mess around replace them all. This is a fiddly and knuckle busting job..