To minimize the fuel "jelling up" in the diesel powered Cherokees of 1986-7, remove the filter sock from the fuel pickup in the tank. This may become critical in colder climates. To do this is relatively easy...

1) run the tank down as low as you dare without having to reprime the fuel injection system. Block up the front of the Cherokee to cause the fuel to flow to the rear of the tank.

2) On the front face of the tank is the opening for the sending unit and the fuel lines. Use a hammer and drift to open the tank fitting (turns anti-clockwise) and pull out the sending unit and fuel pickup. Remove the nylon sock on the fuel pickup. This is also a good time to bend the sending unit float wire to correct any errors in the fuelgauge.

3) Reinstall the tank sending unit/fuel pickup in the reverse of the removal.

The diesel Cherokee is not a common one, but makes one hell of a vehicle. For those that arn't familiar with it, it is a Renault truck engine, a 2.1 litre turbocharged intercooled 4 cylinder diesel. The engine and head are aluminum with wet cast iron liners. This marriage results from a contract Jeep had with the French Army to provide CJ-7s with an "all fuel" powerplant. Under NATO co-production clauses, a certain percentage had to be French content, hence the Renault engine and German transmission (GETRAG, the same people who make the transmission for the Corvette ZR-1). Jeep had a bunch of engines left over after the production run for the French, so they stuck them in Cherokees until they were all gone. I've heard that the total production was 600, 1100, and 3500 units, take your pick.