Leaks when cold-starting on ULSD
My problem of late has been when I use the ULSD for a couple of tank fills, and
have not filled using any Bio. The see-thru portion of the fuel intake line (between
filter and IP) is all air. While trying to crank, after a while the fuel dribbles down
an intercooler pipe shroud, onto the AC compressor, and down to the belly pan and
around it.
Once the car gets running for the day, it starts fine and runs fine until it has cooled
off for several hours or more. Vehicle is a 2002 Jetta TDI wagon, 103k miles.
When I put some (a few gallons) of B99 into the tank, splashed onto the existing
(ULSD) contents, the air no longer gets into the line and it starts and runs fine,
almost no bubbles are visible. I tried to take some pictures yesterday which were
lousy, then spray-cleaned the areas. Today I took some which were somewhat
better. Most areas were clean, for example all return lines and hoses, fuel cutoff
solenoid etc.
I'm a rookie about the FIP; does it look like my leak could be inside the distributor
head, and/or the seal between the head and the main pump housing? Thanks; Larry.
1. Distributor at right, main pump body is at top:
2. Distributor end of IFP ... fuel seems to have run down from the round plug at center,
around the lowest fuel output line: