i have a 2008 gmc 3500.while going down the hwy at freeway speed,with 1/2 tank of fuel.the engine light comes on and reduce power sign is on. fuel filter shows 0% remaining.GMC dealer in flagstff,ran codes and nothing showed up.changed filter and cleaned injectors.Inoticed that when i opened the fuel cap that there was suction on the cap. i was told that the filter return hoses could be collapsing. the dealer in Elko NV said they never heard of such a thing.they replaced the drivers side fuul rail and a flow switch.I still have the same proublem. Is there a blocked vent line?
Make : GMC
Hello and welcome to Just Answer. My name is XXXXX XXXXX X will be assisting you today.
There is the possibility that the fuel feed and/or return line is kinking. These are the rubber lines above the driver side head and the rubber lines along the frame rail. To repair these lines, you must cut the steel couplers that connect the steel lines and the rubber lines. Then replace the rubber lines with fuel compatible lines and hose clamps. I have also seen the lines at the fuel filter housing (inlet and outlet) become soft and collapse under load. I have also seen a bad fuel injection pump cause this condition. I would start be checking/replacing the rubber lines as mentioned above.
16 years GM Tech, ASE Master Certified