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6.5L Diesel Engine Discuss the 6.5 GM diesel engine & associated components. Automatic transmission questions & problems belong in the 4L80/85 - 4L60E - 6L90 Transmission Forum

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Old 02-27-2016, 04:02 AM   #21 (permalink)
JCDiesel
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Quote:
Originally Posted by Towers91 View Post
Just want to say it was as simple as a $24 dollar fuel filter... Old one was naaaaastyy
With the odd LP behavior i would still be suspicious or at least cautious because the restricted flow you were experiencing. Point being as I stated many people put new parts in and all seems ok until the next bout. In my opinion you should still perform a lift pump test as well and check over the wiring. Truck will run even without the lift pump active if you have good flow ip will suck fuel. I know this from experience when I rebuilt my entire fuel system after testing my wiring and harness I unknowingly left the pump unplugged and drove the truck a few miles and noticed only a small lack of power. Im glad you got the truck running and people here are glad to help but we want you to also be successful if not at least aware. Im not being negative just bringing 6.5 awareness to you.

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my guess would be shocks
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Last edited by JCDiesel; 02-27-2016 at 04:09 AM.
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Old 02-27-2016, 04:42 AM   #22 (permalink)
HeavyChevy95
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JC is correct..

A nasty (restricted) FFM element may cause the IP to starve, especially during high FLOW demands, but will not cause noisey LP operation or DAMAGE to the LP in any way, unlike a clogged strainer that will hammer a new LP to a premature death in short order..

Clogged FFM element, LP just thinks the IP is sipping tea, completely unaware that the IP may be struggling to draw fuel through the nasty FFM element.....

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Old 02-27-2016, 05:44 PM   #23 (permalink)
Towers91
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Dually noted, i appreciate the concern, and from what ive noticed, the new lift pump is making the same sound as the old one, a general noisy clicking when priming, dies out when the wait to start goes out. Should i be concerned on the new pump aswell? Maybe bring it back under warrenty?
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Old 02-27-2016, 05:49 PM   #24 (permalink)
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mine runs for a bit, then when pressurized it will stop until you crank the engine over
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Old 02-27-2016, 06:21 PM   #25 (permalink)
94C1500
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The stock LP and many others dead head against pressure, so the stop pumping with no demand. Also, the stock priming function only last about as long as the Glow/WTS on a cold start.
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Old 02-27-2016, 09:17 PM   #26 (permalink)
Towers91
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I know that the pump will stop on dead head, or run til WTS light is out, but is the clicking sound coming out of the new pump a normal sound? If so then i replaced a perfectly fine pump
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Old 02-28-2016, 12:08 AM   #27 (permalink)
94C1500
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Clicking sound is normal vibration, since its mounted on the frame rail. Some of the higher powered ones you can hear them while the engine is running too.
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Old 02-28-2016, 10:02 AM   #28 (permalink)
Towers91
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Ah okay gotcha, i mustof loosened it in its clamp then when i replaced all the lines and caused it to make an audible click instead of a whine which it had before, good to know i guess though, also have a brand new fuel system pretty much other than the sock, and IP
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Old 03-07-2016, 10:08 PM   #29 (permalink)
Towers91
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Soo... It did it again, it ran fine after a fuel filter change, and lift pump change, it ran fine since my last post until tonight, i let it idle to warm it up and it died, still gets fuel to the filter
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Old 03-07-2016, 10:21 PM   #30 (permalink)
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Quote:
Originally Posted by Towers91 View Post
Soo... It did it again, it ran fine after a fuel filter change, and lift pump change, it ran fine since my last post until tonight, i let it idle to warm it up and it died, still gets fuel to the filter
What was the condition of the inside,bottom of the fuel filter canister?

If it is dirty it is recommended you clean it.
What was the condition of the screen manager down inside of the bottom of the fuel canister??

The small screen manager is always forgotten about and can cause issues.

Here is a video of how to remove and replace the screen manager.
https://www.dieselplace.com/forum/63-...ml#post7520401

It sounds like your still getting air in your fuel system as well

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