2002 jaguar 2.5 Xtype how to get fuel pressure ,pump runs but no pressure,replaced pump,car ran for about 35 minutes and quit,no fuel pressure but pump runs

Sometimes a weak pump will just quit if you stress it ..

check your inertia switch on the passenger side kick panel.It is a red switch that control fuel pump pressure.Check and see if its engaged etc.You should here the pump once you turn the key to phase two.This is a start..it the switch is not the issue, check the fuel pump fuse.

No FPR fitted.
Works via fuel pump module.
Module powered from fuse 81 on diagram of fascia fuse box. This fuse gets its feed from the ignition relay.

P1338 is not a documented Jaguar code, the best result I can find for you is
Fuel Pump Driver Module Communication Circuit (Fuel Pump Driver Module)

hope this helps

http://www.bluejag.co.uk

I'd have fuel pressure tested. I had a 95' did same thing. Cold winter day, worked fine, as soon as it got warmer, or hot out, it would quit, and re-start 20 minutes later and go for a distance then die again. If I parked in the shade on a hot day, I'd get further before it quit for the first time. I started carrying a fuel pressure gauge with me. Cool in the morning my fuel pressure was up to spec @ 49-50psi. Once it got warm/hot out and it died, Hooked up gauge and it was at 2-5psi. Let it sit and cool off 20-30 minutes, pressure would jump back up and run good until fuel pump got hot again and then pressure dropped off and car quit. It sure sounds like the fuel pump, but the hard part will be getting the car to the shop at the right time, or they will need to let it run on the lot until it quits to confirm the pressure drop. One thing you can try is when car quits, have a can of WD-40 or quick start with you and a screwdriver. Loosen the clamp on the air intake hose where it connects to the front of the throttle body and pull it off. With vehicle off, turn throttle linkage so the plate opens up enough to spray WD-40 a second or 2 in the throttle body. Then try to start it. If it starts and runs momentarily, then you can be pretty sure it's fuel related and my guess is the pump needs replacement.

Yes, there is fuel pump relay, which is generally located on the passenger side kick panel. But in your case, the fuel pump relay on 2002 model Xterra is indeed located under the dash around the steering wheel, but no you don't need to remove the cover just lay in floor and you can see it, it will slide off a bracket and you can remove and replace it.
Good Luck!

reset the alarn/immobiliser.........

check your fuel filter under the body by the exhaust if it is blocked if not then its the fuel pump

the fuel filter is underneath near the exhaust it is very easy to change 2 clips on each side