Symptoms
Occasional hard starts, sputtering and stalling while driving, and an engine that won't restart straight away. This differs from a PMD fault, which usually stalls without sputtering.
The fix, step by step
- Disconnect the connector and unscrew the solenoid from the top of the injection pump (1/2-in hex).
- Don't lose the coil spring in the bore, and keep dirt out of the pump.
- Install the new solenoid, torque it to 200 lb-in per Stanadyne, and reconnect it.
Tools & part numbers
- 1/2-in wrench
- inch-lb torque wrench
- clean rags
Where to buy the parts
Fuel shutoff solenoid, 1998 H1 6.5 TD (catalog)RockAuto ↗
Hunting a used or discontinued part? Search eBay Motors for AM General Hummer H1 parts →
Rated for a competent home mechanic with a decent tool kit. Confirm torque figures, fluids and procedures against the factory service manual for your VIN, support the truck on stands rather than a jack, and work at your own risk (disclaimer). Some parts links are affiliate links, which pay us a small commission at no cost to you.