Injection Pump Question
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=131291
Printed Date: 18 Jul 2025 at 11:16am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: Injection Pump Question
Posted By: Slim
Subject: Injection Pump Question
Date Posted: 13 Nov 2016 at 2:26pm
Question: Should the fuel being pumped out of the injector lines be pressurized, or only after it exits the injectors? In other words, is it normal for an injection pump to pump fuel at a "flow" rate out of the injector lines our should it be squirting out?
-Slim
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AC 1971 170 WF Gas, AC 185 Diesel WF, AC WD NF, AC '54 WD45 NF, AC 7080, AC 7030, Wheel Horse D-180 Automatic
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Replies:
Posted By: DougS
Date Posted: 13 Nov 2016 at 2:37pm
Keep in mind that the injector lines are much larger than the injector tip. I've opened lines and seen the fuel come out in what you might call drips.
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Posted By: MACK
Date Posted: 13 Nov 2016 at 8:42pm
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The pump pumps unknown amount of pressure. The injector dumps the pressure when it gets to pressure the injector is set at (1250-3750 or more). There would be no end to the pressure the pump could pump. Until line or something else gave. MACK
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Posted By: Tbone95
Date Posted: 14 Nov 2016 at 7:34am
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Like mack says.....Imagine a garden hose running, then put your thumb over the end of it. The injector is like your thumb.
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Posted By: injpumpEd
Date Posted: 14 Nov 2016 at 7:48am
A general rule in any hydraulics, pumps create flow, not pressure. The pressure is created by a restriction, in this case the injector. Now, if you're trying to bleed a diesel fuel injection system and it still won't start, there is a good chance the fuel coming out the injection lines is just transfer pump flow, not actual injection pump chamber volume/flow. When they are working right, there's pretty good amount of force coming out the injection lines, so they should squirt out the lines with authority. Just dribbling may indicate the injection pump isn't pumping the volume it is supposed to, either it's worn out, or something is sticking.
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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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