Question about 1991 Dodge Dakota
You need to do a fuel pressure check.. You will need a special fuel gauge and the appropriate fittings and adapters are needed to properly test the fuel pressure.
1. Relieve the fuel pressure.
Remove the fuel pump relay form the Power Distribution Center (PDC) Start the engine and run until it stalls. attempt restating the engine until it will no longer run. Turn the ignition key off. Disconnect the cable from the negative battery terminal. Replace the fuel pump relay in the PDC. Any if you get any trouble codes at this time you will need to see a shop to have them cleared.
2. Disconnect the quick-connect fuel line fitting fuel gauge into the fuel line using the appropriate T-fitting and adapters.
3. Start the engine and check the pressure on the gauge, your reading should be 49 PSI with the pressure with the engine idling.
4. if the fuel pressure is not 49 PSI:
1) if fuel pressure is higher you could have a pinched of clogged fuel return hose of pipe. if the line is not obstructed check the fuel pressure regulator.
2) if fuel pressure is lower check the fuel filter, look for a pinched of clogged fuel hose between the tank and the fuel rail. check the pressure regulator for malfunctions. Look for leaks in the fuel line.
Hope this helps.
Posted on Jan 16, 2009
The 3 psi is caused by a failed transfer pump. The problem the loss of could be the VP44 injection pump. This pump should be run at min 7psi. I had the same fuel pressure problem. I replaced my stock transfer pump with a FASS DDRP from www.usdieselparts.com. The stock pump is over $200 to replace and will fail again, sometimes right out of the box. The DDRP will supply about 15psi to the pump and is simple to install. I hope this helps.
Posted on May 10, 2009
ASD is in the engine compartment fuse block.
The pump relay should be there also. Check your fuse panel in the truck though.
Fuses, Relays & Circuit Breakers The fuse panel box is to the right of the glove box with the glove box door opened or beneath the instrument panel (dashboard) on 1989-93 models.
Pull out the fuse panel for access to the blade type fuses
Posted on Oct 18, 2009
If fuel pump relay is bad yes it will still get spark.
Sonds like you do have a fuel pump, or fuel pump relay problem, most likely the pump.
Posted on Oct 11, 2010
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Fuel Filter Replacement Procedure
1. The fuel filter is located on top of the fuel tank near the fuel pump module. Fuel lines are permanently attached to filter assembly and must be replaced with the fuel filter.
2. Release pressure from fuel system by removing the fuel pump relay and start the engine and let it die. Crank the engine a couple times after it dies to relieve more of the fuel pressure
3. Disconnect negative battery cable
4. Raise and support vehicle
5. Support fuel tank with transmission jack or floor jack with large plywood board to evenly distribute the weight of the fuel tank. NOTE: It is important to distribute weight evenly to prevent damage to the fuel pump module.
6. Disconnect ground strap from fuel tank
7. Remove inboard fuel tank straps and front "T" strap fastener
8. Lower the fuel tank approximately 6 inches to access the fuel filter assembly.
9. Disconnect the fuel lines at the fuel supply connector and the fuel pump module
10. Remove the retaining bolt and remove filter assembly from vehicle.
11. Reverse removal procedure to install (Don't forget to put the fuel pump relay back )
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