Will not turn over

Tiny
JAMIE HALL-TRIPLETT
  • MEMBER
  • 1990 DODGE DAKOTA
  • 3.9L
  • V6
  • 2WD
  • AUTOMATIC
  • 179,000 MILES
I went to go pick up my daughter who was being discharged from the hospital; truck started fine at home, drove to the hospital like normal; parked the truck as usual. Upon leaving though it turned over but shut off within a few seconds, tried it again and got the same results, third time it starts but doesn't turn over. It will turn over when starter fluid is sprayed but shuts off as soon as the starter fluid burns off. Any ideas on what it could be?
Thursday, January 3rd, 2019 AT 4:56 PM

4 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,139 POSTS
Hi and thanks for using 2carpros.com

It sounds like the fuel pump failed. Here is a link that shows in general how to check for fuel pressure. However, your vehicle has a throttle body and not injection, so you will have to open the fuel system and insert a T in it so pressure can be tested.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Here are the directions for replacing the pump. All attached pictures correlate with these directions. Note: The fuel tank needs removed to access the pump. Often times, the strap bolts are rusted and break. As a result, and this is how I do theses, there are 8 bolts that hold the bed on to the frame. I found it is easier to remove the bolts, disconnect the rear tail lights and remove the bed or safely prop the driver's side up so I can access the pump.

_______

FUEL PUMP/FUEL GAUGE SENDING UNIT REPLACEMENT
REMOVAL:

Fuel Pump Module Removal/Installation

1. Fuel system pressure must be released prior to service.
2. Fuel tank must be removed prior to fuel pump service.
3. While holding the fuel pump module down, remove the retaining clamp. After the clamp is removed release the fuel pump module and it will spring up from the fuel tank.
4. Remove the fuel pump module from the fuel tank.

DISASSEMBLY

Fuel Gauge Sending Unit Service
1. Remove sending unit attaching screws from mounting bracket located on the side of the fuel pump reservoir.

Fuel Gauge Sending Unit Wiring Terminals
2. Disconnect electrical connections from sending unit, and remove sending unit.

Removing Fuel Line Coil From Reservoir
Fuel Pump And Reservoir Assembly
3. Remove drain tube from the side of the fuel reservoir. Be careful not to let the fuel return line and check valve come detached from the inside of the reservoir.

Fuel Pump Mount Bracket

Fuel Pump Removal/Installation

4. Remove the fuel pump assembly by pressing on the mounting bracket with your thumb and forefinger. Press with both thumbs toward the center of the fuel reservoir.

Servicing In-Tank Fuel Filter

5. Remove pump mounting bracket and rubber collar from hose and retain for assembly. Cut the hose clamp from the supply hose and discard. Remove pump/strainer assembly from hose.

Servicing In-Tank Fuel Filter
6. If fuel pump is functioning properly but fuel strainer is defective, use a broad blade screwdriver and "walk" around the strainer mounting ferrule to remove it from the fuel pump. Be careful not to damage the fuel pump inlet. If fuel pump is defective, replace both the pump and filter.

ASSEMBLY

1. Press new strainer onto pump (new pumps come with a new strainer).
2. Install new clamp to attach the fuel pump to the supply hose. Use tool # C-4124, or equivalent, to crimp clamp.

Servicing In-Tank Fuel Filter

3. Reposition pump mounting bracket and rubber collar on the fuel supply hose between the bulge in the hose and the fuel pump.
4. Install the fuel pump inside the fuel reservoir so that the fuel strainer aligns with the cavity in the reservoir.

Fuel Pump Mount Bracket

5. Snap fuel pump bracket into the reservoir.
6. Install the reservoir so that the drain tube aligns with the mounting lugs on the reservoir.
7. Snap the lower-most fuel coil into mounting lugs in the top of the reservoir.
8. Snap the drain tube into the lugs on the bottom of the reservoir.

Fuel Gauge Sending Unit Wiring Terminals

9. Connect the electrical wires to the fuel gauge sending unit.
10. Align the index hole on the reservoir with the index tab of the new sending unit mounting bracket.

Fuel Gauge Sending Unit Service

11. Attach sending unit to mounting bracket and tighten the mounting screws.

INSTALLATION

1. Wipe seal area of tank clean, and install a new O-ring seal on pump.

Fuel Pump Module Retaining Bracket

2. Align fuel pump module with fuel pump mounting bracket (in the bottom of the fuel tank).

Fuel Pump Module Removal/Installation

3. Push fuel pump module into the retaining bracket and hold with one hand while tightening the clamp with the other hand. Tighten the clamp to 40 lb-in (4.5 Nm)
4. Install fuel tank assembly.
5. Perform fuel system pressure test to check for leaks.

Let me know what you find or if you have other questions.

Take care,
Joe
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Thursday, January 3rd, 2019 AT 5:22 PM
Tiny
CARADIODOC
  • MECHANIC
  • 33,729 POSTS
Your terminology is confusing the problem. "Turn over" means the starter is cranking the engine. It sounds like that is working. The third time it couldn't have started if the starter wasn't turning over the engine. See my confusion? Regardless, it sounds like you have a simple failed fuel pump. Unlike GM fuel pumps that commonly start up, then fail while you're driving, leaving you sitting on the side of the road, Chrysler fuel pumps almost always fail by failing to start up, leaving you sitting in the parking lot or driveway. Once a Chrysler fuel pump starts running, it almost always continues to run until you stop the engine.

The clue is the engine will run for a couple of seconds on the fuel still under pressure in the supply line. By the third attempt, that pressure was bled off, so the engine would only run on starting fluid. That, by the way, is a dandy clue that tells us you still have spark. Loss of fuel pressure and spark at the same time accounts for about 95 percent of crank/no-start problems. A loss of fuel pressure only, which you have, typically accounts for perhaps three percent of these no-starts.

First, listen next to the gas tank when a helper turns the ignition switch on. You should hear the hum of the fuel pump for one second, then it will stop. If you don't hear that, bang on the bottom of the gas tank while that helper is cranking the engine. That will jar the pump and get it running over half of the time. When that works, the problem might not act up again for weeks, or it could act up the next time you try to start the engine. The proper repair is to replace the fuel pump.
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Thursday, January 3rd, 2019 AT 5:32 PM
Tiny
JAMIE HALL-TRIPLETT
  • MEMBER
  • 2 POSTS
My apologies for the incorrect terminology! We're going to the truck now to bang on the tank (my husband was under the tank earlier when I turned on the ignition and didn't hear anything). If that doesn't work, still bad fuel pump?
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Thursday, January 3rd, 2019 AT 5:43 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,139 POSTS
Hi and no problem:

The issue could be related to a few things, a bad ground, no power from the auto shut down relay, or the pump is bad. Here are directions for testing:

1. Connect an ohmmeter and check that the fuel pump ground circuit has continuity. If there is no continuity, follow the flow from the fuel pump back to the chassis and perform necessary repairs. If there is continuity, go to step 2.
2. Turn the ignition switch to the "on" position.
3. Connect a voltmeter to the DG/BK wire of the fuel pump electrical connector, and check that that there is 12 volts for approximately two to three seconds. The Auto Shutdown (ASD) relay will only operate the fuel pump for 2 to 3 seconds under a key "on" engine "off" condition.
4. If there is voltage to the fuel pump, and the fuel pump still does not operate, the fuel pump is defective and needs to be replaced.
5. If there is no or low voltage at the fuel pump connector, connect a voltmeter to the DG/BK wire (terminal no. 87) of the ASD relay, and check for 12 volts. If there is voltage, repair the DG/BK wire between the ASD relay and the electrical connector of the fuel pump. If there is no voltage, test the Auto Shutdown (ASD) relay.

___________________________

The Auto Shutdown (ASD) Relay is mounted on the left-hand inner fender in the engine compartment. I attached a picture for you to see its location.

I hate to say it, but there is a good chance it's the pump. If he follows the directions listed above, he can confirm it.

Let me know if you have other questions or need help.

Joe
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Thursday, January 3rd, 2019 AT 8:14 PM

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