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+--- Thread: Hard start, Low Fuel in Fuel Filter & Bubbles in Fuel Filter - Peterbilt 387 (/Thread-Hard-start-Low-Fuel-in-Fuel-Filter-Bubbles-in-Fuel-Filter-Peterbilt-387)
Hard start, Low Fuel in Fuel Filter & Bubbles in Fuel Filter - Peterbilt 387 - zyNoT - 03-25-2018
Hi guys,
Looking to see if someone has an easy answer for this one. Dealing with the same truck as before, a Peterbilt 387, the trucks engine does not start currently. It started previously, but it's always been hard to start. It idles rough as well. Looks to be air in the fuel system. I've attached a video of bubbles in the fuel filter when primer pump is running. The fuel filter doesn't have much fuel in it at all. It's always low, even when it did run. I'm not sure if it is the high pressure pump, lifter (low pressure pump), fuel lines (main + return), fuel filter assembly, etc. Any advice is helpful. Thanks!
RE: Hard start, Low Fuel in Fuel Filter & Bubbles in Fuel Filter - Peterbilt 387 - oxyd0xy - 03-25-2018
(03-25-2018, 05:42 PM)zyNoT Wrote: Hi guys,
Looking to see if someone has an easy answer for this one. Dealing with the same truck as before, a Peterbilt 387, the trucks engine does not start currently. It started previously, but it's always been hard to start. It idles rough as well. Looks to be air in the fuel system. I've attached a video of bubbles in the fuel filter when primer pump is running. The fuel filter doesn't have much fuel in it at all. It's always low, even when it did run. I'm not sure if it is the high pressure pump, lifter (low pressure pump), fuel lines (main + return), fuel filter assembly, etc. Any advice is helpful. Thanks!
had same problem cracked filter assembly
RE: Hard start, Low Fuel in Fuel Filter & Bubbles in Fuel Filter - Peterbilt 387 - burrows_03 - 03-25-2018
Check fuel lines for wet spots. Check to make sure all fittings and or connections are tight. could be a bad oring on a fuel filter assembly (housing with paper filter element) have had this issue after replacing filters a few time. if it is a top draw tank it could be a stand pipe that is cracked. Also had an issue with a high pressure pump on an older cummins it ended up the high pressure pump. But would strongly suggest checking pressures before throwing a pump on it.
RE: Hard start, Low Fuel in Fuel Filter & Bubbles in Fuel Filter - Peterbilt 387 - ralphpad - 03-26-2018
(03-25-2018, 05:58 PM)oxyd0xy Wrote:(03-25-2018, 05:42 PM)zyNoT Wrote: Hi guys,
Looking to see if someone has an easy answer for this one. Dealing with the same truck as before, a Peterbilt 387, the trucks engine does not start currently. It started previously, but it's always been hard to start. It idles rough as well. Looks to be air in the fuel system. I've attached a video of bubbles in the fuel filter when primer pump is running. The fuel filter doesn't have much fuel in it at all. It's always low, even when it did run. I'm not sure if it is the high pressure pump, lifter (low pressure pump), fuel lines (main + return), fuel filter assembly, etc. Any advice is helpful. Thanks!
had same problem cracked filter assembly
Definitely! You can see the wet spot on the filter base, air gets drawn in the fuel system right there!
RE: Hard start, Low Fuel in Fuel Filter & Bubbles in Fuel Filter - Peterbilt 387 - zyNoT - 03-26-2018
(03-26-2018, 09:00 AM)ralphpad Wrote:(03-25-2018, 05:58 PM)oxyd0xy Wrote:(03-25-2018, 05:42 PM)zyNoT Wrote: Hi guys,
Looking to see if someone has an easy answer for this one. Dealing with the same truck as before, a Peterbilt 387, the trucks engine does not start currently. It started previously, but it's always been hard to start. It idles rough as well. Looks to be air in the fuel system. I've attached a video of bubbles in the fuel filter when primer pump is running. The fuel filter doesn't have much fuel in it at all. It's always low, even when it did run. I'm not sure if it is the high pressure pump, lifter (low pressure pump), fuel lines (main + return), fuel filter assembly, etc. Any advice is helpful. Thanks!
had same problem cracked filter assembly
Definitely! You can see the wet spot on the filter base, air gets drawn in the fuel system right there!
It may look wet, however, it's just rain water. Doesn't smell of fuel at all.
RE: Hard start, Low Fuel in Fuel Filter & Bubbles in Fuel Filter - Peterbilt 387 - 4ly-syk - 03-27-2018
more than likely cracked fuel filter assembly...
very common
RE: Hard start, Low Fuel in Fuel Filter & Bubbles in Fuel Filter - Peterbilt 387 - sjw1987 - 01-02-2019
You could try running the fuel lines into a drum and eliminate the tank etc and work your way down the line.