Reverse fuel flow on CAT ?

Very interesting thread! A few weeks ago, While fueling up in Cheyenne, I struck a conversation with another driver about mods he had done to his engine. Just hearing it drive up, you knew it wasn't stock. So, I inquired, and, during the conversation he mentioned opening up the fuel lines from the stock #10's to #12's. The numbers you're mentioning in the thread are different. I assume it's because of location. He told me that CAT starves the motor from the factory and that I should open them up. That was first time I had heard of that, until I researched it on this Forum.
And, Kurt, I haven't forgotten to call you. Just haven't done it. (As if $4.00+ fuel isn't incentive enough)

 

I have a2007 Pete. With c15 acert runs great. Bout after letting it set. A couple days it's hard. To crank. I replaced the. Check valve on return line. Also have the injectors o rings. Replaced. And no luck Any ideas on this. Please

 

Return hose or fittings from head to fuel filter base checked?

 

Interesting thread. I’m having a hiccup when I reach the end of a shift. Best way I can describe it, hiccup, maybe a suck of air or a suck of water .... it seems to be getting more frequent. Cruise on, cruise off - still does it. It’s not ALL THE TIME. I had changed all fuel lines a few years ago, nothing special, just made and swapped them for new. I’m not sure WHEN this hiccup started. AT LEAST 18 months ago. It was infrequent. I thought an injector, but no codes and no change during two separate cut out tests. It’s there more frequently now - daily. I went to another CAT shop and they put a clear sight tube in line with my fuel lines, between the tank and the pump; they used their fitting, sight tube, and long line. We (they) thought it was the frame rail filter housing, replaced that, no change. Then I went home and replaced the fuel line from the filter housing to the transfer pump, no change. I was thinking the housing fittings were sucking air with a hairline crack, or maybe the fuel restriction gauge was allowing air in, so I bypassed the housing - no change.
NOW I’m stumbling. Maybe I got a new hose with the same issue ? Doubtful, but possible. Maybe I’m chasing the wrong symptoms. WHAT size hose should be the main line from the filter to the pump ? I know the fittings are 10. Maybe the line is too large diameter ? I’m pretty sure I made the new lone with 1/2” ID hose.
Any help or ideas are appreciated. Also, the hand primer is still on the truck - original. Tonight I will reinstall the CAT fuel tool (that I had to have) and see if the air bubbles are excessive - though this seems like a vague test method.

 

And what is this upgrade kit y’all talk about ?
Vendor ?
PN ?
Does it work on a 2004 C15 BXS ACERT ?

 

waste of time and money let it alone

 

Change both crank and cam timing sensors.
When one goes bad the ECM diverts to the other sensor. When it does this it causes what you describe, a slight burp or studder. Your issues does not sound fuel related to me. It's electrical.

 

i replaced my check valve in filter head and turned out it was faulty 304 9385 , low fuel pressure and fuel drain back. Brought another new one 3049385 and happy days 100psi idle and no drain back. 304 9385 is check valve on a sdp acert, The older 271 #### check valve can be dissaaembled and the spring goes soft. Seen then shimmed and / or stretched reassemmbled and fuel pressure restored and no drain back