- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
There is no fuel cut off switch. The electric fuel pump only operates for a few seconds when the ignition is switched on and will only remain on when the engine has been started. If the engine is not started and the ignition is left on the computer will cut power to the pump.
If you want to cut all power to the fuel pump you have to remove the fuse for the pump or remove the relay that covers the power circuit to the fuel pump.
Check for 12V on both sides of that 15A fuel pump fuse. The fuel pump relay is ahead of that fuse and it is controlled by the engine controls system. The PPL/BLK wire from the fuse is connected to the powertrain control module (PCM) When the fuel pump relay operates, 12V also passes through the 3A PCM memory fuse (check it) and is applied to the PCM. In addition, there is an inertia fuel shutoff switch (IFS) connected to the PCM and it may have cut off the fuel supply.
what do you mean by "dash lights"? how do you KNOW the pump isnt working? how do you KNOW its good? at the ignition switch the ORANGE and PINK should have power in the RUN position the BROWN and TAN/WHITE should also be HOT in the run position. There should be a red wire near the fuel pump relay, make sure its HOT when cranking. IF its HOT and the fuel pump doenst run, the pump is bad. You can also put 12V on that red wire and power the pump.
Heres a few things to check that could cut power to the fuel pump. The fuel pump inertia shutoff sw
in the trunk on the left side, there is a reset button on the switch if you push the button down and
you hear/feel a click then the switch was tripped and you just reset it. The switch's job is to cut off
the fuel in case of an accident. Next, the fuel pump fuse located in the battery fuse block under the
hood on the right fender well, fuse #1 20amp fuse. Next, the fuel pump relay, the relay is located in
relay center on the left fender well. Hope this is helpful.
Ford released a SSM (Special Service Message) stating that 2003-2004 Town Car, Grand Marquis and Crown Victoria models may exhibit code P1233 with possible drivability or no start symptoms. It suggests that before replacing a suspect FPDM, fuel pump relay, inertia switch, fuel pump sending unit or PCM, the following things should be checked: Check for a loose PCM pin fit issue. Check for a loose or faulty ground at G101, G103, and G400. Check the FPDM harness located behind the rear seat at the base of the C-pillar for chafed wires on the bracket and check for a circuit or connection issue with the Dark Green/Yellow (DG/YE) wire which runs between the FPDM and PCM pin 40 due to a poor crimp. If all of these items check to be ok, perform normal diagnostics for code P1233.
My bet is that you have an open the fuel pump run circuit or the vacuum switch. Most GMs have a vacuum switch to 'see' the engine running and reduce pressure by cutting voltage. However, if your car has a turbo or supercharger, they use a relay that 'flips' to a resistive line which then cuts the power level to the pump. Get a good model-specific diagram and check it out.