7020 wont start without priming fuel pump
Printed From: Unofficial Allis
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=107927
Printed Date: 11 Sep 2025 at 1:24am
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Topic: 7020 wont start without priming fuel pump
Posted By: Leon B MO
Subject: 7020 wont start without priming fuel pump
Date Posted: 22 Jun 2015 at 12:05pm
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It runs fine but 10 after it is turned off it has to be primed with the hand pump to get it started. I assume it is the fuel line but wondering if there is something else to look for. Thanks Leon B ------------- Uncle always said "Fill the back of the shovel and the front will take care of itself". |
Replies:
Posted By: Jwmac7060
Date Posted: 22 Jun 2015 at 2:44pm
| Is your primer plunger good?...I've seen them leak of there before |
Posted By: timr
Date Posted: 22 Jun 2015 at 8:25pm
| Are your bleeder valves tight? Injector lines tight? Our's would lose prime after a week but not that quick. |
Posted By: LB0442
Date Posted: 22 Jun 2015 at 8:46pm
| I have a maroon belly 7060 and it started to have a long crank time after setting, sometimes as little as 3-4 hours after shut down. It was really bad when it would get down to 1/4 or 1/2 tank. I rebuilt the primer pump, parts from injpumped, works perfect now. |
Posted By: victoryallis
Date Posted: 22 Jun 2015 at 9:09pm
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Try changing the rubber fuel hoses they will get tiny cracks and let air in. ------------- 8030 and 8050MFWD, 7580, 3 6080's, 160, 7060, 175, heirloom D17, Deere 8760 |
Posted By: MACK
Date Posted: 22 Jun 2015 at 10:06pm
| If I read it right that it will not start after being shut off for 10 minutes, check the fuel cap. If it looses prime that quick, the tank has a vacuum. Also there is two check valves in primer pump. If some trash gets in one of them it will loose prime. MACK |
Posted By: Leon B MO
Date Posted: 23 Jun 2015 at 5:59am
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It was supposed to say 10 seconds. It will not start only 10 seconds after shut down without priming hand pump. Thanks for the replies, I am going to replace primer pump regaurdless it leaks when I pump it. I will look into it after I get my starter back. Leon B ------------- Uncle always said "Fill the back of the shovel and the front will take care of itself". |
Posted By: MACK
Date Posted: 23 Jun 2015 at 7:40am
| If it don't start after 10 seconds, you have a different problem. Either delivery valve is not seating or pump head is worn out. MACK |
Posted By: Leon B MO
Date Posted: 23 Jun 2015 at 12:14pm
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Thanks Mack Sounds like something for the professionals. I know very little about injection pumps. Leon B ------------- Uncle always said "Fill the back of the shovel and the front will take care of itself". |
Posted By: injpumpEd
Date Posted: 23 Jun 2015 at 1:42pm
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so it will actually start by pumping the primer? If it does, then the injection pump should not be the main culprit. It may be tired, have worn transfer pump liner and blades, but if it will actually restart immediately after shut off, then it's a plumbing/supply issue. Once running, it runs just fine? or erratic governing? low power? ------------- 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! |
Posted By: Leon B MO
Date Posted: 23 Jun 2015 at 2:04pm
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Runs smooth, power ok, exhaust is darker than I like but runs fine after starting. I've only had this tractor for about a year so I don't know any history. Leon B ------------- Uncle always said "Fill the back of the shovel and the front will take care of itself". |
Posted By: Mike NEIN
Date Posted: 23 Jun 2015 at 8:07pm
| My 220 did the exact same thing and the fuel filter would be empty, I took the line off and blew air back into the tank and it's fine now. Still don't have a clue how it could run and not lose power when the filter wasn't full.???? |
Posted By: ILGLEANER
Date Posted: 24 Jun 2015 at 12:14am
I have a 3208 Cat that way Mike,my fuel filter is never full. IG ------------- Education doesn't make you smart, it makes you educated. |
Mike NEIN wrote: