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Old 11-16-2011, 12:03 PM   #1 (permalink)
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Injection Pump Failure.... Symptoms?

What are symptoms of a failing injection pump? I have done allot of searching in this site and google haven't seen anything.

My truck is not making any torque, I am pretty sure its fuel related. I have replaced the lift pump with a cummins unit, all fuel lines, and ofv. This thing is still way under powered. I have also checked for boost leaks to the AFC and throughout the system.

Why I ask for symptoms of a failed injection pump.... The previous owner decided it was a good idea to run a holley red fuel pump in place of the cummins lift pump. I dont know for how long but it was in there when i got it.

What should a look at to determine my lift pump is shot?

Tim
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Old 11-16-2011, 12:16 PM   #2 (permalink)
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Sometimes you have to eliminate everything else it could possibly be. You need some gauges, EGt, boost and fuel pressure at minimum. You also need to verify timing and bump it up some if possible. Slipped timing will cause performance issues as will low fuel pressure, so I would verify fuel pressure is in spec and timing is right. Also, what have you done to modify fuel? These engines are borderline gutless completely bone stock. Once you feel you have eliminated everything it could be other than IP, then take it off and take it to a reputable Bosch pump shop and let them bench test it. Bench testing is not awfully expensive, but once they start going inside, the dollars can start flowing freely, but once again, verify fuel pressure and timing.
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Old 11-16-2011, 12:19 PM   #3 (permalink)
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Stock these things are slower than .....
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Old 11-16-2011, 01:04 PM   #4 (permalink)
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I am going to pick up a gauge pillar today. What do people here do for fuel gauges? Do they mount them in cab or leave the gauge under hood?

Any recommendations for delivery valve removal socket and timing set?

As a side note, thanks for all that have contributed to the write ups in this site. They have a ton of information and have helped me trouble some nasty issues.


As a side note, this is the first diesel truck I have owned. All i have driven in the past are brand new d max trucks. I have no feel what so ever for what the truck should do.
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Old 11-16-2011, 01:36 PM   #5 (permalink)
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You want the FP gauge in the cab so you can see the pressure under load.
Instructions> How to check fuel pressure on a 12 valve

DV sockets and timing sets are available on ebay or if you do a search here you'll find methods to make your own set up for much cheaper.
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