Question about 1996 Dodge Grand Caravan

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Just put a new delphi fuel pump in my1996 grand caraban did this twice. Still im geting no pressure at the shrader vaulve. Van runs on either. The pump and regulator are the same assembly is the pump the problem

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  • Dodge Master
  • 4,128 Answers

Not likely. It is also not likely that the regulator is in the fuel pump assembly. Some people mistake the check valve in the pump as a regulator. Also, some vehicles have a pump module which includes the fuel gauge sensor and that can be mistaken as the regulator by some DIYers. The caravan uses a return-loop fuel system. This means that the pump is cycling fuel from the tank to the fuel rail on one line and the fuel that is not needed at the injectors flows back through another line to the fuel tank. This is done to prevent the pump from building up too much pressure and allows the fuel flowing through the pump to keep it cool. Because of the looping system, there needs to be a flow restrictor (aka regulator) at the fuel rail to provide a constant pressure source for the injectors. The regulator is normally at the end of the rail and will have a vacuum line attached. Pull the vacuum line, place a rag at the vacuum port, and crank the engine. There should be no fuel coming out the port. If any fuel comes out of the vacuum port, the regulator is faulty. The regulator could still be faulty even if there is no fuel from the port, but fuel leakage is an easy way to be sure. If the regulator is not providing proper restriction to maintain pressure, then the fuel simply flows in a circular loop from and back to the fuel tank without enough pressure to allow the injector to do their thing,

Posted on Nov 07, 2014

  • maxmhill Nov 08, 2014

    Ive looked evrywhere for the regulator i see it on the pump at least it looks just like the pic of one. Nothing on the rail but injectors

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