why always #8 injector? - Ford Powerstroke Diesel Forum
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post #1 of 14 Old 02-06-2009, 02:39 PM Thread Starter
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why always #8 injector?

HI IM STILL LEARNING ABOUT DIESEL ENGINES HERE, BUT IVE BEEN READING ALOT OF PEOPLE ARE HAVING PROBLEMS WITH THE #8 INJECTOR AND IM WONDERING WHAT IS THE ISSUE IS IT A DESIGN FLAW?
CAN SOME ONE TELL ME THEIR THOUGHTS ABOUT IT.
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post #2 of 14 Old 02-06-2009, 02:40 PM
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Stop Yelling!!!!!

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post #3 of 14 Old 02-06-2009, 02:41 PM
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I mean, turn off your caps. lol.

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post #4 of 14 Old 02-07-2009, 09:33 AM Thread Starter
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anybody out their can give me an answer?
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post #5 of 14 Old 02-07-2009, 09:38 AM
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Yes. It is a design flaw. It is because on a Powerstroke the last two cylinders in the firing order go #6, #8 ... Being that 6, is immediately in front of 8, it can't catch the "right" amount of fuel so it starves a little. That's why it knocks or "cackles" if you hear about injector cackle, that's it. It's because of this "starving" that the #8 is typically first to go. Some Powerstrokes have a different injector in the #8 hole, that was Ford's cheap fix. A Regulated Return system cures this problem.

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post #6 of 14 Old 02-07-2009, 10:06 AM
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Originally Posted by TurboSevenThree View Post
Yes. It is a design flaw. It is because on a Powerstroke the last two cylinders in the firing order go #6, #8 ... Being that 6, is immediately in front of 8, it can't catch the "right" amount of fuel so it starves a little. That's why it knocks or "cackles" if you hear about injector cackle, that's it. It's because of this "starving" that the #8 is typically first to go. Some Powerstrokes have a different injector in the #8 hole, that was Ford's cheap fix. A Regulated Return system cures this problem.
well put

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post #7 of 14 Old 02-07-2009, 01:37 PM
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Originally Posted by TurboSevenThree View Post
Yes. It is a design flaw. It is because on a Powerstroke the last two cylinders in the firing order go #6, #8 ... Being that 6, is immediately in front of 8, it can't catch the "right" amount of fuel so it starves a little. That's why it knocks or "cackles" if you hear about injector cackle, that's it. It's because of this "starving" that the #8 is typically first to go. Some Powerstrokes have a different injector in the #8 hole, that was Ford's cheap fix. A Regulated Return system cures this problem.
Hit it on the head...starves for fuel...I dont even know why i'm posting...haha

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post #8 of 14 Old 02-07-2009, 03:46 PM Thread Starter
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Ok thanks for the info. I have a aftermarket spring in the fuel return that bumps up
The fuel pressure to 90 psi, would this get the fuel to the #8 injector faster so it doesn't
Starve for fuel? And what were you talking about a regulated fuel system?
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post #9 of 14 Old 02-08-2009, 05:14 AM
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Here's a link to a the regulated return

ITP 7.3L "Standard" Regulated Return Kit

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post #10 of 14 Old 02-08-2009, 05:19 AM
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Originally Posted by new big toy View Post
Ok thanks for the info. I have a aftermarket spring in the fuel return that bumps up
The fuel pressure to 90 psi, would this get the fuel to the #8 injector faster so it doesn't
Starve for fuel? And what were you talking about a regulated fuel system?
90 is kinda high from what I have heard. I dont have one but I have read not to go over 70 psi!

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