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Hook up a fuel pressure gage to the fuel pressure test port on the engine (rent or borrow, make sure you get the right test gage), see if the fuel pressure shuts off when the engine starts to stall. Also do an OBD2 fault code test on the engine control module, it requires a code reader or if you have a nearby Autozone they will read the codes for free.
The first thing to do is check for fuel pressure, the fuel pressure test port is on the top of the engine in the pipe that supplies fuel and sits over the fuel injectors, it looks kind of like a tire fill valve. A quick way to see if fuel is the problem is to buy a can of spray starting fluid, spray it into the engine air intake hose while the engine is cranked over, if it starts then shuts off you have a failed fuel pump or fuel pump circuit problem. Below you will find a link to the wiring diagrams to check the fuel pump wiring circuits. If fuel is ok then run a fault code test on the engine control module. You will need an OBD2 system code reader, you can borrow one from most chain auto parts stores. Read the fault code and then Google them for help with there meanings. http://bbbind.com/free_tsb.html
Have a helper crank it while you visually check for spark at the spark plugs. If you have spark everywhere, use a gage and check fuel pressure. You got to start testing, somewhere. Can you check for applicable trouble codes? To check those, yourself, at the least, you need an obd2 code reader.
I give guys and gals the same info. I don't know any other way.
Discharge the pressure in your fuel system by either removing the fuel pump fuse or disconnecting the inertial cutoff switch and starting the car, allowing it to run until it stalls out. Then turn the key off, remove the key, and let the car sit for a minute or more.
NOW REPLACE YOUR FUEL FILTER (This will save time later.)
Attach a fuel pressure test meter to the test port on the fuel rail.
Insert your key and turn the key switch from OFF to ON (not "START" but ON) three times, holding it at OFF and ON for between 1-2 seconds each time.
Return the key switch to OFF
Look at the fuel pressure gauge. It should read at least 35 p.s.i. (minimum), and should HOLD that pressure for at least ten minutes. If it does not hold the pressure, DISCHARGE THE FUEL PRESSURE again as described above, and REPLACE THE FUEL PRESSURE REGULATOR.
RE-PRESSURIZE THE FUEL SYSTEM AGAIN (the key switch off & on thing above), and then start the vehicle normally. Look at the fuel pressure. Is it at least 40 p.s.i.? YES? Good so far. NO? Either the fuel pump is bad, you have a fuel leak somewhere (should be obvious), or the fuel pickup strainer in your gas tank is clogged.
TURN THE KEY BACK OFF, and be sure you're retaining pressure. If the pressure begins falling immediately, suspect either a stuck injector (would make the car run rough and the "CHECK ENGINE" light stay on), or a defective check valve at the fuel pump (which means you need a new fuel pump).
If the pressure fell with the key off, turn the key back ON. Does the fuel pump have to run for more than 3 seconds to regain full pressure? If so, either your fuel pump is bad or your fuel strainer is clogged. Either way you will need to pull the pump and strainer out of the tank to check.
If your strainer is clogged, your pump is probably fine... just replace the strainer. If the strainer is clean, your pump is bad. Replace your pump.
DON'T WASTE TIME TRYING TO SAVE THE GAS IN THE TANK. I guarantee it is contaminated with water, rust, and other garbage. DISPOSE OF ALL REMAINING FUEL IN YOUR GAS TANK, AND REPLACE IT WITH NEW FUEL.
Turning over is engine cranking, not running. I'm not sure I understood your post?
Use a gage and check proper fuel pressure, 3.4L engine, 41--47 psi.
Any applicable trouble codes? To check codes yourself, at the least you need an obd2 code reader.
I'd want to check if system is running rich or lean?
Since this engine is fully electronically controlled the first thing that must be done is to read the fault codes of the engine control computer and check the fuel pressure from the electric pump. You will need an OBD2 system code reader and a fuel pressure test gauge.
There are a couple of things you need to understand.
First, hearing the fuel pump running DOES NOT mean that the fuel pump is actually pumping. The electric motor part of the pump could be good, while the pump could be completely torn up inside and not pumping anything. The CORRECT way to check to see if your fuel pump is working correctly is to check FUEL PRESSURE at the fuel injector manifold (fuel rail). The fuel pump motor needs to not only run, but also deliver the correct pressure to the fuel rail.
Then there is the question of "had a computer put on it". Did anyone actually interface with the engine computer and look at the computer input and output data? or did you simply connect a generic OBD code reader to check to see if there are any continuous memory fault codes present? Trust me, there is a HUGE difference.
To answer your question about the fuel strainer, it is located inside the fuel tank. Depending on what YEAR your Durango is and WHICH ENGINE it is equipped with (really nice-to-know information when you are asking for help in getting your engine running), the fuel strainer may be available seperately, or you may have to buy a fuel pump module just to get one. In either case, if the strainer is clogged up, it is because of debris inside the tank, which also means the fuel pump is probably wasted and you will need to clean the gunk out of the inside of the fuel tank.
Understanding these things and also understanding any limitations that you may have concerning dealing with these things correctly, can save you a BUNCH of money.
Hi. the fuel pressure sensor is part of the fuel pump assembly. You will have to remove the fuel pump to replace this. I would go ahead and replace the fuel pump while you are there.You will have to Pull the strainer off the fuel pump and discard it. remove the
retaining clip for the fuel pressure regulator so that you can remove
the fuel pressure regulator. Disconnect the electrical connections for
the fuel pumps and the fuel level sensor. Remove the retaining clip for
the fuel level sensor and remove the fuel level sensor by squeezing the
locking tangs. the sensor is incorporated in this area.