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Slim 
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Joined: 16 Apr 2013
Location: Indiana
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 Topic: Injection Pump Question
Posted: 13 Nov 2016 at 2:26pm |
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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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DougS
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Joined: 03 Nov 2011
Location: Iowa
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Posted: 13 Nov 2016 at 2:37pm |
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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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MACK
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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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Tbone95
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Location: Michigan
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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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injpumpEd
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Location: Walnut IL
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Posted: 14 Nov 2016 at 7:48am |
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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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