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New Allis Guy 
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Joined: 01 May 2022
Location: Mitten state
Points: 14
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 Topic: Injection pump help
Posted: 13 May 2024 at 7:14pm |
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I have a 1974 7030 with a Roosa Master DM pump. It's gradually begun to start hard, followed by lack of throttle response and low power. I'm quite confident it's the pump and not engine mechanical. I can not pump fuel through the pump with the plunger. It initially would pump slowly through (with the return hose removed) and now won't pump anything through even with the check valve removed. The plunger completely stops in mid-stroke. It pumps fuel as it should with the line disconnected at the injection pump. I've removed the top cover to inspect for anything that doesn't look right and removed the inlet cone to inspect the screen for debris. All appears ok to me. Is there any other checks to make before sending the pump off to the rebuild shop? Thanks
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injpumpEd
Orange Level Access
Joined: 13 Sep 2009
Location: Walnut IL
Points: 4906
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Posted: 13 May 2024 at 7:24pm |
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Probably just due for a proper rebuild.
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210 "too hot to farm" puller, part of the "insane pumpkin posse". Owner of Guenther Heritage Diesel, specializing in fuel injection systems on heritage era tractors. stock rebuilds to all out pullers!
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rickymotorbrains
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Joined: 25 Jan 2019
Location: dry ridge ky
Points: 56
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Posted: 13 May 2024 at 8:21pm |
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Did you check the filter where line goes on the pump
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New Allis Guy
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Posted: 13 May 2024 at 10:57pm |
 rickymotorbrains wrote:
Did you check the filter where line goes on the pump |
Yes i did. It was totally clear of any debris
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Codger
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Joined: 23 Dec 2020
Location: Illinois
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Posted: 14 May 2024 at 4:51am |
Injection pumps wear and get "tired" just as we do. Certainly wouldn't hurt to send it over to Ed for evaluation to start, and go from there. I always send the nozzles, (injectors) into the fuel shop at the same time to be balanced/calibrated to the pump myself.
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A career built on repairing and improving engineering design deficiencies, shortcomings, and failures over 50 years now.
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tbran
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Joined: 14 Sep 2009
Location: Paris Tn
Points: 3291
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Posted: 16 May 2024 at 8:07am |
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You ask for checks - we always remove the fuel inlet hose and use a separate fuel supply to the pump. Like a 2.5 gall jug of clean fuel with a hose connected to the pump inlet. Down through the years we have have several calls per year "we sent the pump off and it is still doing the same thing". A new pump with a leaky, as in air, or restricted fuel supply (or restricted return to tank) will not fix these issues. That is the check we use to determine the need for rebuild.
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When told "it's not the money,it's the principle", remember, it's always the money..
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New Allis Guy
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Joined: 01 May 2022
Location: Mitten state
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Posted: 20 May 2024 at 12:29am |
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Thanks everybody for the input. I was going to have my pump rebuilt but the local diesel place had one ready to go on
the shelf. I installed it and it starts and run like new. Thanks again
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