Fuel issue

air in fuel may be a cause of missfire

 

Air in the fuel is very hard on the injectors, will cause codes in the ecm, and starting problems.
Look at all the fittings, especially at the tee's and any shut off lines.
I fought that problem on my last volvo, until we replaced all the lines. Was told the lines was sucking in air through the lines from age. My Volvo used the plastic line which is the same as air brake line.
After replacing these, couldn't beleive how smooth the engine ran. Shortly after had an injector go out.

 

I got this problems with air in the bowl , but was caused by the fuel line fittings going in and out of the water separator; are stupid designed, not tight, cheap plastic clamps; I replaced with brass fittings and problem solved. I also got "check fuel filter" msg, after PM/ oil change, the technicians didn't install the rubber seals from the bottom and top properly; This water separator can cause problems, filling up quick in cold weather or bad fuel; I keep one spare and a circular wrench in my truck all the time, and replace it myself if needed, many drivers bypass it.

 

BTW, check fuel tank equalizer too, it was a problem with version-II FH cabovers in Lugansk in 2006-2007 (air in fuel). I sugest it was global problem becouse volvo sent us replacement parts with MADE IN BRAZIL label))) LOL