Does anyone know what the fuel presure is supposed to be at the service port on the injector pump? i have about ten pounds and thought there would be more after replacing lift pump and filter.as soon as the pump quits i lose presure rapidly.of course it is not starting but at the end of cranking sometimes it sounds like it is trying to start. drove home fine then would not start. 2000 dodge 2500 diesel. thanks
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Pump does nor know pressure pcm energizes asd. Relay turns on pump for ten seconds to ensure pressure at injectors is correct for initial cranking try cranking engine while hitting tank and see if it tries to start if it does the pump is worn out.
I have seen two different problems with symptoms like this. 1. A leaking injector. If one of the injectors is leaking a small amount through the pintle on the end of the injector it will bleed the fuel system presure off and dribble fuel into the cylinder, fouling that cylinder. When you try to start it the fuel that has pooled into the manifold will create smoke when it does start. And since the fuel pressure has bleed off to zero PSI in the fuel supply lines it will need time for the fuel pump to recover the system up to normal operating presure. Presure testing (bench test) of the injectors is needed to verify this. 2. A bad fuel pump, relief valve, or bleed-back check valve will bleed the fuel system presure off while it is sitting. To find out if this may be the problem a fuel presure guage set needs to be installed and then run the engine, verify the operating presure is normal, and then shut the engine down and watch the fuel pressure for exessive drop.
The leaking injector is more apt to create the smoke when it fires up, but both can cause this. I would start with check #2 first. Of course there are many other things that can cause symtoms like this but these 2 are the most likely causes.
Hope this helps, if you have any further questions just ask!
I would look more at your injector pump than the lift pump....Dodge does have a problem with there fuel delivery ( not enough consistent PSI ) which in turn takes out the injector pump mainly because the pump has be running to lean...So look at replacing your delivery pump with something 14PSI or greater, unfortunately sounds as though you will have to get your injector pump either replaced or rebuilt
2006?? if so then its common rail with one high pressure pump ,the fuel through the filters is low pressure anyway ,then it goes into the high pressure pump that delivers the pressure to the injectors .If you dont know what your doing with this new piece of kit then refer to the dealer because it has a lot of fancy electronics controlled by encrypted software
Here's the procedure for checking the fuel pump. I would 1st change the fuel filter, 2nd would be to scan for engine codes (free service at most parts stores), then check pressure (on a cool day, below 70 degrees) Good luck, let me know what u find. Curt
1996 Dodge Truck Dakota 2WD 2.5L SFI 4cyl
The Fuel System Pressure
44-54 PSI (Pounds per Square Inch)
Vent the fuel tank vapors by loosening the fuel cap
and unplug the injector wiring harness from the main
engine wiring harness. The next step is to
attach an electrical jumper between a solid
ground and the fuel injector terminal pin number 1.
Next, connect an electrical jumper between the battery
positive post and injector terminal pin number 2
for a period of time not to exceed 4 seconds. This
serves to bleed down pressure from the fuel system.
Install a fuel pressure gauge on the fuel rail service
test port and energize the fuel pump. This will bring
the system to a stabilized fuel pressure that can be
visually verified on the gauge.
hi how are you?just because you hear the fuel pump running does not mean that it is pumping enough preasuer to the motor to open the injectors. you need 48 lbs with key on engine off and with the vacume line off the presure regulator.if you have enough presure then you will have to check for a good blue spark.the fuel presure test port is located just under the thermostat housing on the steel fuel rail.