Just joined and happy to be here!! 2016 F350 Super Duty XL w/40K miles.

I'm suffering repeated low pressure codes w/eng light and limp mode activated just after changeing both fuel filters. I followed the same procedure at 20K miles without issue. Dealership took $400 (purge and clear) and failed to fix the issue, so I'm interested to DIY if possible.

Here's the situation:
a. At key-on, Lower pump/filter runs for an extended period (say 10-15 secs) and seems to make abnormal noises.
b. After several seconds of key-on, the top-side filter seems to make a hissing noise.

Qs:
a. What is the normal lower pressure pump run duration after key-on?
b. Does the abnormal lower pump noise indicate that replacement is needed? Any concerns in doing it myself?
c. Is there a flow test that shoud be conducted to further diagnose the issue?
d. If the issue is corrected by a pump replacement, does the eng light/limp mode reset automatically? Or do these need to be cleared electronically? (...or perhaps a hard reset/battery disconnect?)

Thanks for any advisement provided!!
Dano

 

You are posting in the 6.0 forum. 2016 model would be 6.7. Maybe someone can move your thread to the right place.

 

Just joined and happy to be here!! 2016 F350 Super Duty XL w/40K miles.

I'm suffering repeated low pressure codes w/eng light and limp mode activated just after changeing both fuel filters. I followed the same procedure at 20K miles without issue. Dealership took $400 (purge and clear) and failed to fix the issue, so I'm interested to DIY if possible.

Here's the situation:
a. At key-on, Lower pump/filter runs for an extended period (say 10-15 secs) and seems to make abnormal noises.
b. After several seconds of key-on, the top-side filter seems to make a hissing noise.

Qs:
a. What is the normal lower pressure pump run duration after key-on?
b. Does the abnormal lower pump noise indicate that replacement is needed? Any concerns in doing it myself?
c. Is there a flow test that shoud be conducted to further diagnose the issue?
d. If the issue is corrected by a pump replacement, does the eng light/limp mode reset automatically? Or do these need to be cleared electronically? (...or perhaps a hard reset/battery disconnect?)

Thanks for any advisement provided!!
Dano

 

You are posting in the 6.0 forum. 2016 model would be 6.7. Maybe someone can move your thread to the right place.

Thanks!! I moved it over. Sorry...having some confusion on navigating the site.