8.3L injection pump, fuel rack sticking.

[jimbo66348]

Does anyone have a fix for an 8.3 injection pump rack that is sticking?

 

[Elijah95]

Does anyone have a fix for an 8.3 injection pump rack that is sticking?

Lube the outside, and fill your filters full of cheap atf, prime the pump by hand and let the truck sit for a day. Check it then and let us know


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[davidb56]

A frozen Injection pump Fuel Rack, what to do? - UtterPower.com

I remember MJ McCarroll telling me about the folks who worked on fuel injection pumps in his part of the Midwest, “They’d pull down the shades before they worked on a pump, it was their bread and butter, and they didn’t want … Continue reading →

www.utterpower.com

 

[jimbo66348]

Lube the outside, and fill your filters full of cheap atf, prime the pump by hand and let the truck sit for a day. Check it then and let us know


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I will let the mechanic know that. Thanks.

 

[WillWagner]

The internal rack? Might not be the rack itself, could be a rusted, broken delivery valve or a governor issue.

 

[jimbo66348]

The internal rack? Might not be the rack itself, could be a rusted, broken delivery valve or a governor issue.

It's something on the fuel side. Ty.

 

[WillWagner]

Take it off and bring it to a reputable ADS shop. 1) WARRANTY, 2) experience and knowing when a part is FUBAR, 3) ever seen an engine that someone that had tried to fix a pump by themselves? I have, a few times, was kinda cool to look through it! 4) right the first time, if taken to a good shop. 5) can YOU balance the output of the delivery valves at home?

Didn't think so

Just sayin', but, it is your junk, do what you want.

 

[jimbo66348]

Take it off and bring it to a reputable ADS shop. 1) WARRANTY, 2) experience and knowing when a part is FUBAR, 3) ever seen an engine that someone that had tried to fix a pump by themselves? I have, a few times, was kinda cool to look through it! 4) right the first time, if taken to a good shop. 5) can YOU balance the output of the delivery valves at home?

Didn't think so

Just sayin', but, it is your junk, do what you want.

If I have to year it apart, I will. Just trying to avoid that.

 

[74M35A2]

Are you sure it is not just the throttle and linkage?

Anything else damaged? I’d guess a sticking rack could be caused by water laden fuel, or an engine overheat.

Pretty low cost to have a shop give your pump a tune up. Great time to turn it up and advance the timing on it as well, if you wanted.

 

[WillWagner]

Hey Clint, you will never have a rack stick in you ISL .

 

[jimbo66348]

Are you sure it is not just the throttle and linkage?

Anything else damaged? I’d guess a sticking rack could be caused by water laden fuel, or an engine overheat.

Pretty low cost to have a shop give your pump a tune up. Great time to turn it up and advance the timing on it as well, if you wanted.

Yes. I pulled the hex plug out of the top of the governor section. The rack doesn't move with the throttle lever, and it moves rather sluggish with a screwdriver. Was running fine, new fuel. It just sat for two years, and viola!

 

[74M35A2]

Are you sure the rack is stuck? The rack goes to full throttle once the engine stops, and the governor pulls it back once running. I’m not doubting you, just a thinking check.

 

[Elijah95]

Yes. I pulled the hex plug out of the top of the governor section. The rack doesn't move with the throttle lever, and it moves rather sluggish with a screwdriver. Was running fine, new fuel. It just sat for two years, and viola!

Honestly that sounds like gummy fuel, Did you do the ATF trick?


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[jimbo66348]

Are you sure the rack is stuck? The rack goes to full throttle once the engine stops, and the governor pulls it back once running. I’m not doubting you, just a thinking check.

I hold the shutdown solenoid in the run position, and when I move the throttle shaft, the rack doesn't move. It stays in the shutdown position. It won't start as well. I move the rack with a screwdriver, it runs. The rack acts like it's gummed up. I can move it back and forth, but it's stiff, or has a lot of resistance when moving it .

 

[WillWagner]

If I remember correctly, what Clint said is incorrect. A Bosch pump when it shuts off goes to zero delivery. I think I remember it being past the idle setting. And I think I remember the rack being held at 0 delivery by a magnet inside. Detroit Diesel 2-stroke start at full fuel. You might have gotten some nasty Fuel and it's rusted the delivery valves. I doubt that there's anything wrong in the governor end, it is oiled, so unless there is water in the oil, my sorta educated guess will be thst there is an issue in the fuel side. Try removing the overflow valve and see if there's any rust on it, if it is one that can come apart, pull it apart and see if the spring is Rusty

 

[jimbo66348]

If I remember correctly, what Clint said is incorrect. A Bosch pump when it shuts off goes to zero delivery. I think I remember it being past the idle setting. And I think I remember the rack being held at 0 delivery by a magnet inside. Detroit Diesel 2-stroke start at full fuel. You might have gotten some nasty Fuel and it's rusted the delivery valves. I doubt that there's anything wrong in the governor end, it is oiled, so unless there is water in the oil, my sorta educated guess will be thst there is an issue in the fuel side. Try removing the overflow valve and see if there's any rust on it, if it is one that can come apart, pull it apart and see if the spring is Rusty

No rust on the delivery valve. Was good fuel, and just had oil change done.