injection pump tester

[kaffine krazed]

Ok I'm most likely crazy for even thinking of this idea but I've got a nightmare of a truck that has made me want someway of testing injection pump pressure.



I am thinking about getting a guage that can read to 30,000psi a check valve and a set of injector lines and some fittings. My plan is to have a hose shop put tees in the injector lines so I can hook up a check valve, then another tee one side of the tee goes to a pressure release valve the other side goes to a snubber then to the pressure guage. This way if I have a truck that has a misfire and every thing else test good test the injection pump instead of sending it out to be tested this way I know what it is doing when the probelm happens not that it tested good on there bench. Am I just crazy or is it possible?



The other idea is to use the pezio(sp?) electric puse detectors that clamp to the fuel line to allow use of a timing light. The problem I see with that is I'm not getting a pressure reading I'm just getting a pulse as long as there is enough pressure for the sensor to detect. It doesn't tell me that all the injector lines are getting the same pressure of if one of them is getting 5000psi and the others are getting 15,000psi.



If you have any other ideas on how to measure injection pump output pressures I would like to hear them. Thanks.

 

[Joe G.]

One thing you can try. Grip the injector line with your fingers. They should all feel the same pulse. A missing injector will seem to have a light pulse or no pulse. For some reason this does not work as well with these engines as it does with some others, but you can feel the injection pulse. Other engines I have worked on would almost bounce your fingers off the line. These injections systems are kind of soft that way.

 

[drees1]

I do not believe your idea will work. The added volume in the system will throw off everything, if it works at all. If you want to test on a truck the best way would be to make a test line to a test injector, and measure the volume of fuel delivered at conatant rpm over time. Start the engine get up to speed, start the stop watch at x volume in the burette, and stop the clock at y volume. Repeat for all speeds with each cylinder, using same injector.



Problem is you cannot load the engine and measure anything but idle fuel rate.



A bench test uses calibrated injectors and loads the pump and measures delivery over a range of speed, load, and boost. I paid $225 to have my pump tested and calibrated, which was a standard rate. Considering what you are trying to do in the truck, it was easy to pull the pump and pay the money. A used test stand will likely run $3 - 5 grand if it is in good shape.



Are you trying to get set up to do R&D, or just have a pesky problem with your truck?????

 

[kaffine krazed]

Thankfully it's not my truck. The pump had already been sent to an injection shop and tested good. I'm just not one to trust someone else running a test on something and not giving any data other than it passed. I would really like to have a injection pump stand where I work but I'm going to have enough trouble getting the shop to buy an injector tester. I'll most likely be the one that buys it along with sevral other tools that the dealer should have. Of course Dodge is strange on what tools they consider essential tools they dealer must have. They consider the adapter to check compression on the 03 diesel an essentail tool and sends one to every dealer. They do not consider a diesel compression gauge an essential tool . I guess they expect the tech to hook it up with a gas compression gauge and if it pegs the gauge and bends the needle that cylinder has good compression