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:) Fuel Delivery was the problem. I believe the sock on the sending unit was intended for gasoline NOT diesel. The suction line from the sending unit going to the lift pump was removed and inserted in a 5 gallon fuel can, pressure at the ‘T’ was about 4 psi when running. She ran well...

Thank you Burning Oil, when we get her back on site there will be some of those tests including pulling the sending unit/s After checking fuel system when we get her back ...CODE Reading and the cps thoughts will be high on the list of things to check

OK... that spinning must be a thing with 1997 GMC K3500's from MA. :>). I picked her up from a guy in MA a couple of years ago and still have not accumulated more than 300 miles since she was titled in PA

check the uploaded pdf for sending unit info. it has an email and telephone numbers

Any suggestion as to where to start this procedure from

Could you please provide more information on the 'racor' unit?

Short of removing the cable and checking for continuity are there any suggestions?

She's sitting at an offsite location presently.

The truck has been a problem child with fuel/stalling problems for quite a while. The sending units have both been replaced due to rotted lines and gauge accuracy issues. (The fuel gauge looks like it is spinning when cranking the engine.)

OK AK Diesel thank you... will check for pressure @ T. Volume

The Diagnostic Checklist: Please fill out to best of your knowledge. 1. Describe the problem you are having in detail: February 25, 2010 After changing the PMD module to a remote FSD Stanadyne ‘GREY’ 36976 with a resistor number 6, 7, 8, or 9 the vehicle was running rough when started...