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The question is, will the engine run OK under road conditions, when the only fuel return is from the spill rail to the top of the fuel filter? At the moment the normal return to the tank is blocked, as the tank it goes to is removed for repair. The background is: I'm currently trying to make roadworthy an ex military 109" with twin underseat tanks, where a PO has changed the 2.25 Petrol to a 2.25 Diesel. The RH tank is leaky, and out of the vehicle for repair. The PO fitted just one fuel return, to this tank, and I've currently blocked it off. Using fuel in the LH tank, I have successfully started the engine, and run it on tickover for long enough to get the thermostat open. The 'return' from the spill rail goes to the top of the fuel filter, and it was this junction I opened to bleed the system before starting the engine. Thanks.
Basically, ive got a petrol Series 3.. Am going to convert to 200tdi. Question being, how is best to connect up the return fuel pipe? Should i get the proper bit that screws in the tank, from a diesel, so it has the feed and return pipe? Or just drill and solder a fitting to the one i already have? Then it gets complicated... I've got dual fuel tanks. The feed goes through a diverter switch, connecting either tank, and the fuel gauge sender of the relevant tank. Are there any diverter switch that switch feed and return? Or will i need to get a seperate switch and link the two some how? Any thoughts on this / how to go about linking two switches? Cheers