The alarm immobilizer does not have any control over the fuel pump, only the engine mgt computer. Wherever the relays are stored in the DI, (under the hood in the P38 Range Rover) find the one for the fuel pump. Directly add power (by jumpering into the terminals from the batt or another relay) My guess is the fuel pump will run. You could try swapping a relay (they should be color-coded.) Perhaps your disco still uses the old Rover system of fuseable links (my '92 Classic does; my P38 does not.) I don't think its an alarm issue.
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Current:
1992 Range Rover County
2000 Land Rover Discovery II
Also current:
1995 Mercedes-Benz E320 Wagon
2002 Volkswagen Eurovan GLS
1996 Ford Explorer LTD 2WD
1982 Volvo 240 GL Diesel
Previous Rover:
1995 Range Rover 4.0SE
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