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I did not say "air" was entering - though it could be, and I also said the transfer pump was "slightly starved". Read the section on the Fuel Solenoid and if you cannot see how the energized cycle is lessened or increased by fuel demand as engine rpm I cannot help you read and understand...

Wrong. See https://www.thetruckstop.us/forum/threads/opinions-needed-performed-optical-bump.49575/post-610023

FIVE years it ran without a problem. A spare is because you cannot walk into a parts store for replacement, and still I have not used the emergency spare. I have pointed out real world truths. And when certain people told the world what COVID was going to do, they got this reaction too. It...

I think the best way for anyone to understand it the OEM solenoid pump specs which are now 10 to 14 psi for most all of the ep158, ep1000 for the 2000 and up vehicles that have same interchangeable IP and the previous years were in earlier years 7 to 9 psi cannot see there was a problem. The...

Then it is likely the waste gate solenoid or the map sensor - both five to ten minute replacements.

Does it move by hand when cold back and forth without the engine running by push and pulling at the actuator shaft?? It might be mechanically stuck closed which also allow an ovrrboost situation.

Putting a higher wattage calibration resistor permanently in the cable actually better

Depends where you live as to heat and moving or sta ding still a lot. My pmd is in cool airflow right at the front of the hood. But still standing still the pmd does not get HOT only warm. See my post at...

The last paragraph you wrote is 100 percent correct. Mounting an axternal cooler in a hot place does not help. A heavy foot driver does not help. Sometimes the pmd does not fail but the connectors loose temper and electrical contact. See my post at...

I did not say or imply the power transistors are glued down, I said use cpu heat sink transfer grease when replacing them. That is to assure the heat from them transfers to the pmd case and from there to whatever it is mounted on. Remote mounting the power transistors is not likely to work...

I repaired pmds for a while. You need a dremel type tool to route out the epoxy potting material on stanadyne units. There is none - as in direct access - once you pop the cover under the Chinese / Dorman pmds to the solder connection on the pins and to get to the Phillips head side of the...

A quick tip. You might consider using Cooper or aluminum tubing and only rubber tubing to connect the lines at the device. It won't melt or get brittle like those gm small plastic tubing. You might need to hunt down the small copper tubing at a good hardware store Wasre gate solenoids get...

Here is the Stanadyne DS4 test procedure and exploded diagrams with part numbers. 31488 is correct This test is performed usually on a Hartridge or similar stand that has the Stanadyne module ecm add on Note the housing pressure checks at specific rpm. Note that the test occurs at the...

OK I will say working to spec return valve.

I stand behind my previous post - I would replace the valve with a proper DS4 return check valve. The actual Stanadyne part numbers for the DB2 versus the DS4 is different. These 6.5 engines most likely all have had the IP swapped or rebuilt at some point. It is very quick and easy to put a...

Stanadyne explains this at page 1.8 of section H of the Stanadyne DS Service manual I linked to earlier

EXACTLY... 100 percent!! It is just that I am not willing to pay $600 and more for a fuel pump system with no spare easy to replace for a vehicle barely worth much more than 3 to 4 times that much to sell it. Most in the diesel industry know to stay clear of any 6.5 powered anything!! The...

Don't know if that glass, Torlon I could see maybe - they are usually white. They are resistant to algae sticking on them. They are also used on transmission valve body plate repair kits where steel balls dimple the plate. Like https://www.thetruckstop.us/forum/members/ak-diesel-driver.2334/...

Yes db2 and db4 is where gm's head got stuck. On the db pumps higher pressure changes the timing. Here is a link to the DS4 service manual. At page 1.8 section H it talks about the return fuel circuit duty to limit housing pressure to 5 - 14 psi, and that means the check ball starts to open...

Well as I read the whole post, I was waiting for the post where you discovered that the lift pump pressure was not good enough. There are a number of things that matter, but the number one is good presistant high lift pump pressure. The OEM style solenoid pumps do not work at all or for long...