Cummins ISX Fault code 128: F01

Good afternoon!!! I’m wondering has anyone had a similar problem.... I have a 2007 International 9400i with a Cummins ISX motor. Few weeks ago I noticed diesel was being pulled from driver side tank and not pulling from the passenger side. Took the truck to my local mom and pop mechanic. Couldn’t find the problem. He tells me to take the truck and that he fixed a “breather” issue. Truck runs great for 150 then throws a 128:F01 code on dash. I look it up only to find it’s a low fuel pressure code. Truck looses throttle. No power, runs really sluggish. I also notice that the passenger tank is filling up and over flowing. I take the truck back to my mechanic and he changes the fuel pump both high pressure and the lift pump. As it turns out he was it had nothing to do with the diesel flow. Took it to International and replaced the vents. No more problems with the flow of the fuel , however, I’m getting the low pressure code randomly. It goes active while at idle and the truck surges. I had the mechanic change the high pressure pump again and now it only stays active for a few seconds to a couple minutes. It surges while it’s active then goes away completely. Again, before the second high pressure pump the truck losses power indefinitely. With the second high pressure pump it throws a code temporarily and either goes passive on it’s own or will go passive once I’m driving and again drive perfect for 3 or 400 miles and maybe throw the code for a minute or two. Surge while the code is active then go passive again and drive perfectly. 2 weeks at International and no problem found. Any suggestions will help. Just put 25k into this motor and I’m afraid to run a load.

 

My apologies for miscommunication but the 25 was for a new head, rocker arm repair and replace, front gear housing, rear main seal, new clutch, turbo actuator amongst other things. My point is if I can’t find this fuel problem then all that was for nothing. International had the truck for 2 weeks and told me they can’t find a problem with the truck. Said go run it... sure then have a break down, have to get a tow and possible claim on freight. When you say “plumbed” I may need you to put that in dummy terms lol. I know the tubes are connected from the top of the tank so it appears they suck from the bottom of the tank. Is there a particular test that I can request to check for air or a cracked tube? I appreciate the help brother. This one seems to stomp the hell out of the average mechanic!!!

 

Got it. Thanks again brother!!!

 

Thanks for the response.