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Old 02-24-2010, 11:17 PM   #1
roachie
 
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Injector return

Why is it necessary?

Seen some comp engines with and without it.

Just wondering.
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Old 02-25-2010, 10:29 AM   #2
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I'm not even sure how the injector return functions.
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Old 02-25-2010, 10:34 AM   #3
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It's a bleed off for fuel that leaks past the plunger, if it's plugged pressure will build in the injector body and the injector will no longer function properly.
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Old 02-25-2010, 11:02 AM   #4
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Little off topic, what fitting on the injector return?

I have forgotten what it is, let alone the thread sizing.
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Old 02-25-2010, 11:23 AM   #5
12valveAnderson

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Are you talking about the check valve bango fitting in the back of the cylinder head.
 
Old 02-25-2010, 11:25 AM   #6
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No, talking the line on a 12v.

Guess I should have mentioned that.
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Old 02-25-2010, 11:30 AM   #7
12valveAnderson

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Oh was thinking for some reason you were talking about commonrail cm850.
 
Old 02-25-2010, 11:30 AM   #8
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Keep it.

The fuel bypassed by the needle guide is pushed upward through the spring, shim, and then into the return passage. If you delete the return, the trapped pressure will fight against the incoming pressure as it tries to lift the pintle.
Click the image to open in full size.
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Last edited by Smokem; 02-25-2010 at 11:48 AM.
 
Old 02-25-2010, 04:20 PM   #9
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Sounds simple enough. Stock lines are low grade SS arent they?
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Old 02-25-2010, 05:07 PM   #10
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I just used a compression fitting...others have just used a piece of hose and a hose clamp...there's not much pressure there

Chris
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Old 02-25-2010, 05:17 PM   #11
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Quote:
Originally Posted by stock600 View Post
Who wants to chance any fuel leak on the track though or anywhere for that matter. A hose pushed over a slick piece of tubing and a clamp is a potitial problem later, easier to do it right once. AN fittings wont leak
I agree...just saying...

Chris
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Old 02-26-2010, 12:54 PM   #12
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Russell Performance 641481 - Russell AN to Metric Adapter Fittings - Overview - SummitRacing.com



this is your fitting
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Old 02-28-2010, 05:25 AM   #13
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Just call up the guys at airdog my airdog kit came with a adapter to t the injector return and the pump return together and a pushlock fitting back to the tank.

Anybody know what either of those returns run at psi wise?
 
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