testing injector pump
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Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=38678
Printed Date: 27 Apr 2025 at 11:42am
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Topic: testing injector pump
Posted By: bradley69
Subject: testing injector pump
Date Posted: 10 Oct 2011 at 5:30am
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how can you tell if injector pump work right i have fuel to the injectors but won't start up . was running fine for 30mn then like the fuel was turn off.
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Replies:
Posted By: bradley69
Date Posted: 12 Oct 2011 at 5:42am
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how much psi come out and how to check the timing of it
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Posted By: DrAllis
Date Posted: 12 Oct 2011 at 5:49am
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Remove ONE injector assembly from the cylinder head. Re-attach it to it's injector line with the injector assembly pointing out/away from the engine. Don't worry or connect the return line. Crank the engine over and see if you have fuel squirting from the end of the nozzle tip. Keep your hands away when testing. Remember, the starter/batteries must "spin" the engine over with speed or the injection pump won't work.
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Posted By: DrAllis
Date Posted: 12 Oct 2011 at 6:29am
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Also, do not worry about checking the timing......it doesn't change by itself.
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Posted By: Clay
Date Posted: 12 Oct 2011 at 8:43am
Bradly, not to sound like a smart a## but is there fuel in the tank?
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Posted By: bradley69
Date Posted: 13 Oct 2011 at 5:43am
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yes i have fuel 1/2 tank. and the timing of the injector pump the chain don't jump at all
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Posted By: DrAllis
Date Posted: 13 Oct 2011 at 6:15am
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There is no chain. The timing doesn't change by itself.
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Posted By: Brian Jasper co. Ia
Date Posted: 13 Oct 2011 at 6:19am
If it was running fine and then stopped like you turned it off, check your shut off linkage. If it is ok, I'd bet the pump seized and twisted the shaft off.
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"Any man who thinks he can be happy and prosperous by letting the government take care of him better take a closer look at the American Indian." Henry Ford
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Posted By: bradley69
Date Posted: 14 Oct 2011 at 5:53am
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so how can i check if the pump seized up and took the shaft of there was no noise when it turn off. i have a day off coming to test this out. thanks to all that are helping out
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Posted By: DrAllis
Date Posted: 14 Oct 2011 at 6:01am
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On the side of the injection pump body, there is a small rectangular cover ( about 1 inch tall and 1/2 inch wide) that is held to the pump with two flat blade screwdriver screws. Remove the cover and use something to catch the fuel that will run out. Have someone hit the starter with that cover removed and there needs to be rotation of whatever is visible inside the window.....no rotation or movement means the pump is siezed/junk.
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Posted By: bradley69
Date Posted: 15 Oct 2011 at 10:33am
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i remove the cover and the side thats in front spins around i did it two times the back one that has a line in it don't
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Posted By: DrAllis
Date Posted: 15 Oct 2011 at 10:54am
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Then, I don't think the pump has siezed, which is a good thing. Do the injector removal thing and see if it will squirt fuel out of an injector assembly.
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Posted By: bradley69
Date Posted: 15 Oct 2011 at 10:34pm
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ill be testing that tomorrow the wife think spend to much on my stuff so had to spend the day with here. i told'er the snow is coming and she be out there shovel it
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Posted By: Brian Jasper co. Ia
Date Posted: 16 Oct 2011 at 8:53am
If you need to reprime the pump, I have found that a shop vac works well for this. Loosen the supply line at the pump, reverse the vac so it blows through the hose, put the hose over the filler neck of the tank, when you get straight fuel from the supply, you're primed.
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"Any man who thinks he can be happy and prosperous by letting the government take care of him better take a closer look at the American Indian." Henry Ford
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Posted By: bradley69
Date Posted: 16 Oct 2011 at 4:22pm
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ok i took the line of at injector and turn it over no fuel coming out. so i took off the return line and put vacuum pump and there was no fuel. the gasket i made for fuel bowl was blow in up blocking fuel line. but i put the vacuum pump on and when got good fuel out it started right up ran for about 15mn then same thing like fuel turn off. what fuel flow should be going in to there looks like a fast drip
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Posted By: bradley69
Date Posted: 17 Oct 2011 at 5:16am
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its like fuel flow not flowing right for the pump or the pump sucking in air. fuel to the top of pump seem to flow good better than bowl. crack the line on the pump you get fuel and air out
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Posted By: DrAllis
Date Posted: 17 Oct 2011 at 6:08am
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Disconnect the sediment bowl and unthread it from the bottom of the fuel tank and while you hold your finger in the hole of the tank have someone else ( your wife?) take an air compressor and blow all the crap out of the inlet to the sediment bowl. I am assuming you have changed your fuel filters???
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Posted By: bradley69
Date Posted: 18 Oct 2011 at 5:53am
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well that will take a day get the wife to do that and maker under stand what she doing . lol by chance do you know the fuel filter part number the parts people here don't under stand how to you's a book
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Posted By: stray
Date Posted: 18 Oct 2011 at 5:03pm
What tractor model are you working on?
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1969 190XT series 3
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Posted By: bradley69
Date Posted: 18 Oct 2011 at 9:27pm
Posted By: Brian Jasper co. Ia
Date Posted: 19 Oct 2011 at 6:52am
The filters on mine came from Napa. Tossed the boxes long ago. I don't even bother with O'Reilly or the other cheap parts places.
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"Any man who thinks he can be happy and prosperous by letting the government take care of him better take a closer look at the American Indian." Henry Ford
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Posted By: JC-WI
Date Posted: 19 Oct 2011 at 9:10am
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It could be somethng like the rubber hose breaking down from filters to the injection pump. You need fuel flowing freely. Maybe you have crap floating in the tank that needs to be cleaned out of there?
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Posted By: stray
Date Posted: 19 Oct 2011 at 6:25pm
Using the Agco parts web page and crossing on Wix web page, Primary is Agco #74048789 and crosses to Wix 33102, The secondary is Agco 74048796 and crosses to Wix 33101. Any parts store should be able to cross the Wix number if they don't carry them (they will be able to do that in the computer and don't have to go to a book.) O'Rielly's and Bumper to Bumper both carry Wix don't let them sell you a house "brand." If you go to Napa get at least the gold filters numbers 3102 and 3101. They will tell you that the cheaper ones are made by Wix and they may be, but they are built to the stores cheaper specs.
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1969 190XT series 3
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Posted By: bradley69
Date Posted: 19 Oct 2011 at 7:57pm
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thank you for the filter number. i have tomorrow off i be checking that fuel line out . i post back with findings
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Posted By: stray
Date Posted: 19 Oct 2011 at 9:45pm
Don't for get to check and clean the screan in the top of the sediment bowl.
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1969 190XT series 3
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Posted By: bradley69
Date Posted: 20 Oct 2011 at 2:54pm
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well found that there was no fuel out of tank. i pulled the sediment bowl of and blow air back to tank and nothing. so i pulled it off and found some like some crap in it. put back to get there and put vacuum pump on return in tell fuel. started up and ran in tell i turned it off. now the tranny new post. thank you for all the help
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Posted By: Brian Jasper co. Ia
Date Posted: 20 Oct 2011 at 7:19pm
What kind of crap? With the removal of sulfur from diesel comes more algae growth. If it's snot like and brown, green, or clear, you may need to treat with some bio-cide to kill off any algae/bacteria growing in your tank.
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"Any man who thinks he can be happy and prosperous by letting the government take care of him better take a closer look at the American Indian." Henry Ford
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