| RELATED TOPICS |
6.5L STALLING PROBLEMS
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If your 6.5L Diesel stalls there are usually two main causes. The first and most common is the PMD (also called FSD).
The other possibility is the Optical Sensor located in the pump itself.
"How do I know what to replace?"
Simply put, if your check engine light is not on and you experience stalling, it is a 95+ percent certainty that you need
a new PMD. If your check engine light is on, you need to get your codes checked. Auto Zone and others will do this for
free. If you ONLY have codes P1216, P1217, 35, 36 or any combination of those, you need just the PMD.
If you have codes P0251 or PO370, 17, 18, or any combination of those, you should consider the injection pump
suspect.
So what is this PMD?
PMD stands for Pump Mounted Driver. The same part is also called an FSD or Fuel Solenoid Driver. (One is GM
terminology, the other Stanadyne terminology). It is a "black box" about the size of a pack of cards mounted on the
driver's side of the injection pump.
Is there anything else I should check before I buy ?
Check to be sure your lift pump is running. The lift pump delivers fuel to the injection pump and is located on the
frame rail under the driver's seat. The lift pump will NOT cause stalling, but when it goes bad, the injection pump runs
hotter which shortens PMD life. See lift pump under products for instructions on checking the lift pump.
Make sure you have good clean fuel with no water
Check all electrical connections - battery terminals, engine and body grounds, and all fuel injection pump wiring. With
the batteries disconnected open up all connections (including those at the bulkhead) and look for loose or corroded
connections, but do not spread open the terminals. Take your time and look carefully for chafed wiring.
In 99% of cases if you have the classic 6.5L stalling (and no optical sensor codes) the problem is the PMD.
The other possibility is the Optical Sensor located in the pump itself.
"How do I know what to replace?"
Simply put, if your check engine light is not on and you experience stalling, it is a 95+ percent certainty that you need
a new PMD. If your check engine light is on, you need to get your codes checked. Auto Zone and others will do this for
free. If you ONLY have codes P1216, P1217, 35, 36 or any combination of those, you need just the PMD.
If you have codes P0251 or PO370, 17, 18, or any combination of those, you should consider the injection pump
suspect.
So what is this PMD?
PMD stands for Pump Mounted Driver. The same part is also called an FSD or Fuel Solenoid Driver. (One is GM
terminology, the other Stanadyne terminology). It is a "black box" about the size of a pack of cards mounted on the
driver's side of the injection pump.
Is there anything else I should check before I buy ?
Check to be sure your lift pump is running. The lift pump delivers fuel to the injection pump and is located on the
frame rail under the driver's seat. The lift pump will NOT cause stalling, but when it goes bad, the injection pump runs
hotter which shortens PMD life. See lift pump under products for instructions on checking the lift pump.
Make sure you have good clean fuel with no water
Check all electrical connections - battery terminals, engine and body grounds, and all fuel injection pump wiring. With
the batteries disconnected open up all connections (including those at the bulkhead) and look for loose or corroded
connections, but do not spread open the terminals. Take your time and look carefully for chafed wiring.
In 99% of cases if you have the classic 6.5L stalling (and no optical sensor codes) the problem is the PMD.
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