The_Josh_Bear
Full Access Member
@MJGenay I guess we should have mentioned that air can get in without liquid leaking out. Air is much thinner.
Another way to see if there is air in the fuel filter is to just pull the filter in the morning before starting or doing anything else. If it's half full of fuel then you've got a drain back issue, which is likely.
Deleting the return line from the filter housing to the #1 injector return cap was actually a factory TSB, BUT I recommend putting a check valve in that line instead. A real one. There's one inside the filter housing behind that fitting but getting a stand-alone check valve works better for longer. Like this:
1/4" check valve on Amazon
I would gut the old check valve and get something like that.
Just to make sure, did you check the IP inlet? Mine was leaking there a bit for the last few weeks and would get air intrusion like crazy during the first few minutes before the fuel warmed up. Made for harder starting but it would try to take off on me just pulling out of the driveway and down the street.
Lubricity is key for these pumps...I also would caution using straight Seafoam. But maybe I'm wrong. ATF works great.
Another way to see if there is air in the fuel filter is to just pull the filter in the morning before starting or doing anything else. If it's half full of fuel then you've got a drain back issue, which is likely.
Deleting the return line from the filter housing to the #1 injector return cap was actually a factory TSB, BUT I recommend putting a check valve in that line instead. A real one. There's one inside the filter housing behind that fitting but getting a stand-alone check valve works better for longer. Like this:
1/4" check valve on Amazon
I would gut the old check valve and get something like that.
Just to make sure, did you check the IP inlet? Mine was leaking there a bit for the last few weeks and would get air intrusion like crazy during the first few minutes before the fuel warmed up. Made for harder starting but it would try to take off on me just pulling out of the driveway and down the street.
Lubricity is key for these pumps...I also would caution using straight Seafoam. But maybe I'm wrong. ATF works great.