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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Depends on engine type and tune. Early Throttle body injection was 11 to 13 psi and later 18 to 24 psi.
Port injection is mainly 32 to 52 psi, if you are looking for a start point I would use 42 psi or 3 bar. My current 496 chevy runs at 62 psi.
Hello Monica, that is a wide area to cover ,so you can go to auto zone site and log in (its all free) go to (my vehicle)in put info then go to (repair guide) then to sub catagorys there are a few including trouble shooting. check pressure regulater and or vacuum supply to it as well, you should have a test port next to it or near, test it with a pressure gauge to see ,pressure should be 35+ pounds . i really hope this helps you ,if it does please let me know
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!
locate the fuel rail (where the injectors are) there should be a test port on there. take a pen and push the little valve core in. If fuel comes out with good presure you know you have fuel. If not you probably need a fuel pump. Next remove a spark plug, with it plugged in groung it to the engine block and have someone crank the motor. You should see spark, if not you probably need a distributor or ignition coil. The last thing to test if everthing was OK is to do a compression test on 1 cylinder to make sure you have adequate compression 100 pounds usually.
i have an 88 chevy truck, not getting gas to come out of injectors.. getting gas all the way through the lines all the way up to the tbi but not out of injectors. pressure gage check done! new fuel regulator done! . u can put gas in the throttle body and it fires right up.??
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.
Check fuel presure.I believe its 61 to 65 psi, with little or no drop off in ten minutes.V-6 access port for fuel presure is at left rear of engine,(remove dog house to access). Fuel pump is in fuel tank.Use AC Delco only, there is a updated wire harness conector for these.
Check the fuel pressure at the service port to make sure that you are getting the correct pressure to the injectors. Also make sure that you are indeed getting fuel to the injectors. If both are good, then you have an electrical problem, not a fuel delivery problem.