This is beyond the scope of this article. If you have a scan tool, plug it in at this point and determine if you can retrieve data from the computer. This is further confirmation that the computer is in functional condition. If you do not have a scanner you may still proceed with the following tests as presence of the check engine light is sufficient evidence of a live computer and the following tests will provide further verification.
Disconnect the optical sensor connector from the injection pump. This is the large square black connector directly on top of the injection pump. Again try to start the truck. If the truck starts and runs, this means that the optical sensor is outputting faulty data preventing the truck from starting.
By unplugging the sensor, you put the system into backup mode and the computer relies on information from the crankshaft position sensor. In the very unusual case that both sensors were bad, the truck would not start with the optical sensor disconnected.
The engine shutoff solenoid is a round silver device about an inch in diameter and several inches high that stands at the driver's side front corner of the injection pump. Unplug the solenoid and connect a test light across the two wires in the connector coming from the vehicle NOT the side coming from the solenoid.
Have someone crank the engine. If the test light lights proceed to the next step. If it does not light, then you will need to obtain a wiring diagram and trace the circuit. You can also unscrew the solenoid from the injection pump and apply 12 volts to it to verify that the plunger retracts.
Failure of this part is rare, however. At this point, we will verify if the engine is receiving fuel. Keep your hands and eyes back and have someone crank the engine and watch for fuel to squirt from the open lines.
There will not be a large quantity of fuel, but there should be a definite squirt. A slight dribble is not acceptable. Tighten the lines and proceed with diagnosis. If there is a potential that the truck has been run out of fuel, has been sitting for a very long time, or has had the fuel system open, it may be necessary to bleed the fuel system. If none of these is true of your truck, skip the following procedure. First, open the fuel filter water drain valve described earlier and crank the engine until fuel is observed flowing freely from the drain line.
Secondly, loosen the injection lines at all 8 injectors. Disable the glow plugs by removing the glow plug wires, disconnecting the relay, or removing the glow plug fuse.
Connect a battery charger to the vehicle and place it on a medium to high setting not "jump" setting. Have someone crank the engine for an extended period - as long as you feel comfortable doing so without doing starter damage - usually 15 to 20 seconds. Wait 10 minutes for the starter to cool and do it again.
After repeating the process several times, fuel should begin squirting from some injection lines. Tighten up those that squirt, and repeat until all lines are delivering fuel. Then start the truck after re-enabling the glow plugs. Disconnect the PMD black module on the driver's side of the injection pump about the size of a pack of cards.
Inspect the terminals in the connector for damage. Connect a digital voltmeter set to the DC voltage scale with the black lead connected to a good clean engine ground and the red lead touching the terminal connected to the green wire in the PMD connector.
Have your helper crank the engine and record voltage observed. It should be roughly 1. If this voltage is present, it means that the computer is commanding the PMD and injection pump to deliver fuel - proceed with diagnostics. If the voltage is not present, you have either a wiring or computer issue - obtain a wiring diagram and diagnose. The next steps check power and ground at the PMD.
I recommend our Haynes Manual ssd if your first time replacing a pump for the basics. Then if you have any further questions, please contact tech support thru the website. Can ship in business days. Loading, Please Wait I was having trouble with my truck bucking and poor fuel milage,even after a factory warranty installed injection pump.
Walt told me what to try and asked if the truck was doing other things wich he was right. After the fsd, 9 resister,vac,turbo and egr I am thankful for the part you sent me. I was very impressed with the ease of installation as per your instructions.
Open the T-Valve for a minimum of 30 seconds and let fuel drain from the line into a container. If during the 30 seconds the engine dies or no fuel flows out of the line then your lift pump is bad.. When the fuel pump is failing or has failed, you need to get your car to your mechanic post-haste. A Fuel Pressure Gauge — You can attach a fuel pressure gauge to the vehicle engine directly.
This will allow the vehicle to start so that you can drive it to your mechanic. For our trucks, we should be using a DS or a DS Also look for a green metal tag on one corner of the IP - this generally means that the rebuilder has revamped it with the latest internal changes. From what I can tell of the history, the DS is the first generation.
Avoid these unless it's been upgraded with the ceramic rollers - the metal rollers inside them will shred unless you run an additive 24x7. As for replacement - I'd consider having a Stanadyne shop do the work. It's a royal PITA to get to all the stuff you need to take one off and replace it. Local shops here in Phoenix charge about dollars: pump removal, refurbish, and reinstall. Article on the Mechanical Injection Pump. Stanadyne EFI injection pump, used from to in GM light duty pickups, delivery vans and in to model year Hummer turbo diesels.
This injection pump can be used in naturally aspirated and turbo charged applications. Not starting, stalling, hard starting, and hesitation are injection pump symptoms.
First, check that the engine is getting uncontaminated fuel and there is no water in the system. Just so you are aware if water gets to the injectors, they will be destroyed. There are several ways that water is blocked, so it is unlikely this will happen. Depending on the problem the truck may go into 'limp home' mode. When the timing signal is 'missing' the system will advance the timing to the max, hence the engine will get very noisy.
The trans doesn't up shift and you can drive about 30 MPH. Your engine will be running at higher RPM's due to this. My 97 turbo diesel wagon would stop running for no reason at very unexpected times. After checking the fuel lines, lift pump and changing the fuel filter, I took it to a GMC dealer to have them run a computer scan on it. The scan from the tech 2 came back with the codes P and P both indicating a bad injector pump.
Getting a p will generally give you something else paired with it. Best case - you dump a bunch of Stanadyne Fuel System additive in for a few weeks, clear the code out with the OBDII tool, and you'll never get it again. My Hummer has only 51, miles on which I do not think is a lot for this kind of diesel engine, so I called Stanadyne the manufacturer of the injector pump.
After I read them the codes they explained that the optical sensor in the pump had failed. They gave me the model number of the pump used in all diesel hummers DS Lookup Diesel in the Yellow pages to find a local dealer. Note that these prices may be outdated now. Use a scan tool to clear the DTC codes but you must also cycle the ignition. You can also disconnect the battery which will supposedly clear the codes. This is what stops your engine when you shut it off.
It is an electrically controlled valve that shuts off the flow of fuel to the injection pump. The valve can leak, the coil in the valve can go bad or you can have have failing electrical connections which will make it at best intermittent. Thank Ross Schmitz for this great info. Symptoms are occasional hard starts, stall with sputtering during driving and would not restart right away. The last episode put my truck on the back of a flat bed for a ride home. This differs from a FSD problem.
Typically when you have a problem with the FSD the engine doesn't sputter and usually starts up fine.
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