Hi there, my 4D56 needs constant priming by pumping the plunger on top of the fuel filter. i have fit a new fuel filter and it appears to be houses correctly with no leaks. Once the engine start it will run like normal...until you next shut the motor down. Regards, Darryl

Air filter,hust unclip the metal clips around the housing.
Fuel filter,undo the bolt at the top, unclip the plastic pipes either side of the filter.
Prefill the new filter with fresh clean diesel, bolt in place then pump the black knob on top of the filter to prime. If the car will not start, release the plastic pipe nearest the front of the filter and pump until fuel comes out,then refit it.

Hi Mervyn, The easiest way of replacing the fuel filter is to disconnect the intake and outlets pipes and remove the retaining nuts from the housing. Remove the unit from the vehicle and hold the pump housing not too tightly in a vice and unscrew the old filter and the sediment sender unit from its base. Screw in the sediment unit and fill the filter with clean fuel. Dip your finger into the fuel and wipe a smear around the rubber seal and the holding the housing upright, screw it together, refit to the vehicle and prime by pushing on the plunger until the action becomes hard. Start the engine and if required, bleed each injector by opening the 17 mm joint onto each injector until fuel is released during idle. Retighten each after about five seconds and any misfire due to air should be dispelled and once all have been bled idle should be smooth. Regards John

It could either be a fuel pipe between your prime pump and injector pump that sucks air so your diesel flows back into your fuel tank. Or you need to replace the prime pump.There is a rubber diaphragm in the prime pump that gets worn. Unfortunately need to buy a new prime pump. A simple sollution is to fit a non return valve to your fuel line. That need to be connected between the prime pump and fuel tank. Hope it helps. Blessings

Check your fuel tank, fuel pipe and hoses might have a leaky somewhere.. else your injection pump has a leaky internal high presure pump.

IS THE ENGINE TURNING OVER? IF IT IS YOU MAY HAVE TO BLEED AIR FROM THE FUEL SYSTEM, IF THERE IS A MANUAL PRIMING PUMP, USALY BUILT AS PART OF THE FILTER HOUSING OR REMOTELY MOUNTED ON THE FUEL SYSTEM PUMP THE PLUNGER THILL IT GETS HARD THERE SHOULD BE A BLEED SCREW MOUNTED OPEN IT AND STROKE PLUNGER UNTIL YOU SEE BUBBLE FREE FUEL COMING THROUGH CLOSE OFF THE BLEED SCREW AND PUMP PLUNGER TILL HARD AGAIN THEN TRY STARTING

Most likly the filter housing needs to be replaced and or the fule lines to and rom the housing. the housing has the plunger on top and the filter screwed under. The plunger goes bad on these and causes air to enter and then become air locked. this is also very comon on the IPR with the fuel filter housing mounted behind cab on frame rail driver side. road sault gets to these and degrades the unit untill it sucks air. On the c 4500 you need to get the oem fuel lines because of the tight space restrictions to route the lines. the OEM lines are molded to make the tight bends required.

Hope this helps... Good luck

you just srew old one off ,and fill new one with clean fuel if you have some ,and the prime it with plunger top of fuel filtre housing till it feels tight do not overtighten new filtre if car does not start prime again until it does

duramax diesel trucks do not have a lift pump. start with the simple things make sure your fuel filter is tight and check the shreader vlave on the fuel rail if that don't help check the filter housing for a leaks arround the heater element or a crack in the housing itself

This post is a little old, but for those also curious, YouTube has videos on the Ford Escape, the sister vehicle to the Tribute. Fuel filter can be found at the link below:">