Will not start
SOURCE: 1988 Jaguar Vanden replace headlight
What you need to do is remove the 2 screws on the top bezel from inside the engine bay, then underneath the outer corner of the plastic headlamp surround there is a philips screw, (put your head under neath car near from wheel) loosen the screw, do not remove it, now the headlamp plastic bezel/surround will come free enough so you can get a philips screwdriver in through the middle of the headlamp surround, there is a chrome retaining ring holding the headlamp in place, loosen the 3 philips screws (do not remove) The retaining ring will rotate and you can slide the ring out from the outer edge of the headlamp surround. The headlamp will then come out throught the middle of the surround, disconnect the 3 pin multiplug and reverse process for install.
SOURCE: 1989 jaguar xjs v12 fuel mixture
Chances are the coolant temperature sensor or its wiring have failed, or the vacuum line to the MAP sensor is leaky or broken (I believe the V12 in '89 guise uses MAP sensors). The MAP sensor measures Manifold Absolute Pressure. Along with this pressure the ECU looks at engine RPM. It also measures air temperature. Knowing pressure and temperature we know density, and knowing engine speed tells us how much volume of air is going through the engine. All of this together is computed into air mass and is used to calculate how much fuel mass should be admitted. If the vacuum line is broken, the ECU reads less vacuum and produces rich mixture thinking that the engine is under high load.
SOURCE: No oil pressure what so ever in v12 jaguar
have you tried reversing the pipes and see if that makes any difference other than that there must be a pressure difference between the two pumps try priming the filter with oil before starting.
SOURCE: 1988 Jaguar XJ6 S-LINE 4.0L V-6
Fuel pump is bad or plugged fuel filter it seems. Crack the line from the filter leading towards the engine first. If gas starts squirting out fast, you have good pressue. If not the filter is plugged or a bad pump. How old is the fuel filter by chance? If original its plugged up by now
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