XJ40 ( XJ81 ) 1986 - 1994

93 model cranking but not firing - fuel related

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Old Apr 27, 2026 | 05:55 PM
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From: Harlow
Default 93 model cranking but not firing - fuel related

Hi

I have a problem with the car turning over but not firing. It started with loss of power with engine quitting, then OK for a couple of weeks then happened twice in my last trip, managed to get home, from then on won't start.

First thing i checked fuel pump relay (good), then bridged the relay socket pins 30 & 87 nothing from the fuel pump (in tank model) no purge noise but reading 12 volts, also checked socket at top of the tank 12v supply good (wiring to tank OK) so assumed fuel pump failiure, replaced with a new one yesterday. Once all put back first turn of the key up it fired and idles nicely, job done. However today won't start same issues as before, checked electrics again 12v to tank as before. but pump still silent.

I also tested the old pump and works ok. I presume there is some sort of float switch inside the pump as it works on its side but not upright.

Any ideas

Regards
 
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