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Old 03-03-2009, 11:45 AM   #1 (permalink)
JLanzino
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1991 GMC Sierra 1500 1/2 6.2 Diesel Pump

Hi I have a 1991 GMC Sierra 1500 1/2 ton with a 6.2 under the hood with 900,000 KM on her Injector pump went wondering how to replace it. The engine is 100% all original inside this is the first thing that went on her.

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Old 03-03-2009, 02:00 PM   #2 (permalink)
sshewchuk
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Drain coolant, remove fan, belts, ac compressor, water pump, intake, injector lines (absolute best way is to have a line wrench style crows foot works AMAZINGLY). Set the dots on the gears so they line up, then remove the gear off the pump in the front and the 3 bolts @ the back.

It is very easy to do once you get into it.
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Old 03-03-2009, 04:43 PM   #3 (permalink)
JLanzino
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Thanks
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1991 GMC Sierra 1500 SL 1/2 Ton Regular Cab, Long Box, 6.2L C-Code Detroit Diesel, 700R4 Transmission, RWD, 3:08, 1`000`000 Km & Counting All Original My Garage
1991 GMC Sierra 1500 SLE 1/2 Ton Extended Cab, Long Box, 6.2L C-Code Detroit Diesel, 700R4 Transmission, 3:73, 4X4, 295`000KM
1991 GMC Sierra 2500 SL 3/4 Ton Regular Cab, Long Box, 6.2L J-Code Detroit Diesel, 4L80E Transmission, 3:73, 4X4, 556`000KM
1994 GMC Sierra 3500 SLE 1 Ton Crew Cab, Long Box, Dually, 6.5L F-Code Detroit Turbo Diesel, 4L80E Transmission, 4:10, 4X4, 405`000KM,
1988 GMC Sierra 1500 SL 1/2 Ton Extended Cab, Long Box, 5.0L H Code, TH400 (3L80) Transmission, RWD, 3:42, 306`000Km & Counting
1991 GMC Sierra 1500 SL 1/2 Ton Regular Cab, Long Box, 5.7L, 700R4 Transmission, RWD, 3:08, 256`000KM
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Old 03-03-2009, 10:10 PM   #4 (permalink)
mattthebrat
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With that many miles errr, kilometers, it might be a good idea to do the timing chain as long as you are in there, and injectors would be good for the old girl too.
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Old 03-04-2009, 11:47 AM   #5 (permalink)
GREASE FIRE
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Quote:
Originally Posted by sshewchuk View Post
Drain coolant, remove fan, belts, ac compressor, water pump, intake, injector lines (absolute best way is to have a line wrench style crows foot works AMAZINGLY). Set the dots on the gears so they line up, then remove the gear off the pump in the front and the 3 bolts @ the back.

It is very easy to do once you get into it.

do you really have to remove the water pump to replace the injection pump on a truck?
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Old 03-09-2009, 06:28 PM   #6 (permalink)
craig 379
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IP removal and replacement.

Don't quote me, though i'm almost certain there is no need to remove the timing chain cover or water pump. If you remove the oil filler tube, you can gain access to the IP driven gear - to pump bolts by cranking the engine by hand a little at a time until they are best lined up, and then they can be removed with a socket. I thought i was going to have to remove my IP recently, and thats the way i was going to do it.

Last edited by craig 379; 03-09-2009 at 06:43 PM.
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Old 03-09-2009, 11:43 PM   #7 (permalink)
D.Camilleri
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Injection pump is easily removed without removing water pump. Care must be taken not to drop bolts or spring/button from end of pump.
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Old 03-10-2009, 12:37 AM   #8 (permalink)
lot1954
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you do not need to remove water pump or fan not even belts or ac pump. if you are doing a timming chain then yes doing a injection pump then no. to pull inj pump take intake off then take the oil filler spout off the spout is where you put oil in your engine there should be 1 or 2 bolts holding this in grab ahold of it and move it back and forth it will pop out look inside the hole there are 3 bolts in there take them out. becarefull not to drop them inside those 3 bolts hold the pump to the gear now take the injection lines off by the injectores there will be some brackets holding the inj lines take them off. now look at your timming marks there will be 2 lines one on cover the other will be on pump remember where they are make a drawing or something so when you put it back together you put marks back where they where. take the fuel supply line off take throttle and trans linkage off a couple wires and there might be a bracket that hold your fast idle on. take the 3 nuts off that hold pump to the front cover. now what i do just before i slide pump out i take inj lines off by the pump and finger tighten them back on injectores and move them out of the way so the lines stay on injectors now slide pump out. here go to this sight at autozone it will help you understand what i am saying. ( http://www.autozone.com/shopping/rep...00c1528008f274 )

Last edited by lot1954; 03-10-2009 at 12:38 AM.
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Old 03-10-2009, 01:58 AM   #9 (permalink)
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Lot1954 Is right that is the best way to change the pump if you do it the other way it will take a long time! I would put one of the socket magnetics in your socket to help keep the bolt in it. Be careful take your time and it should run fine. To bleed the air out of the system get the air out of the fuel lines going to the injector pump first then crank it with the injector lines broken open just enough to get the air out at the injectors about two 7 second bursts should give you bubbles at the injectors then close them down enough to give it a chance to fire on the next crank. If you have any questions ask I will be glad to help........Good Luck,......Simon
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Old 03-10-2009, 02:10 PM   #10 (permalink)
JLanzino
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Thanks to every one that gave me the info on how to fix the pump

Thanks Again
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1991 GMC Sierra 1500 SL 1/2 Ton Regular Cab, Long Box, 6.2L C-Code Detroit Diesel, 700R4 Transmission, RWD, 3:08, 1`000`000 Km & Counting All Original My Garage
1991 GMC Sierra 1500 SLE 1/2 Ton Extended Cab, Long Box, 6.2L C-Code Detroit Diesel, 700R4 Transmission, 3:73, 4X4, 295`000KM
1991 GMC Sierra 2500 SL 3/4 Ton Regular Cab, Long Box, 6.2L J-Code Detroit Diesel, 4L80E Transmission, 3:73, 4X4, 556`000KM
1994 GMC Sierra 3500 SLE 1 Ton Crew Cab, Long Box, Dually, 6.5L F-Code Detroit Turbo Diesel, 4L80E Transmission, 4:10, 4X4, 405`000KM,
1988 GMC Sierra 1500 SL 1/2 Ton Extended Cab, Long Box, 5.0L H Code, TH400 (3L80) Transmission, RWD, 3:42, 306`000Km & Counting
1991 GMC Sierra 1500 SL 1/2 Ton Regular Cab, Long Box, 5.7L, 700R4 Transmission, RWD, 3:08, 256`000KM
Proud Member # 992 Of The 3500 Dually Club, # 40 Of The Old SOBs, # 117 The Regular Cab Club, Member Of The ODPC
Proud Fan Of The Montreal Canadiens

Last edited by JLanzino; 03-10-2009 at 02:11 PM.
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