Originally Posted by
Pirkaus
The best method I know for locating suction side air leaks is cleaning all fuel lines and filters well.
Apply a little(A LITTLE!!!!) air pressure to the fuel tank, then look for the fuel leak.
Fuel water separators and filter housings are prime locations.
I have also seen fuel pick up tubes with a hole in it, this is usually intermittent and fuel level related.
Depending on the engine there may also be check valves at the high pressure return line as well as the injector return.
Good luck hunting it down.
I read this to Mr H and he nodded thoughtfully throughout. Haha way better than when I read him something & he makes that annoyed face.
Apparently much of this has been done but not all. Enough so that he asked me to text him your post to share with our mechanic. So thanks, we'll let you know if we find it. Of course there have been many occasions already when we thought we'd solved this problem, so it may take awhile to know.
