Quote:
Originally posted by Hatterasguy
I have an air leak, it is in the clear line that goes from the fuel pump to the spin on filter, the inlet line. At idle there are bubbles in the line and when I rev. the engine up to 2k-3k the fuel going in turns almost milky! I'm glad I changed those lines there nice and clear now I woudn't have be able to see the air leak with the old ones. The car runs fine, the only problem is it skips really badly in the morning. I'm thinking the IP needs to be rebuilt, but was planing on testing the injectors first. Could this air leak be related to the skipping? Could the fuel pump cause this? It is a 1987, 603, 300SDL.
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The bubbles entering the injection pump are causing the engine skip.
Air can only enter the fuel system from the gravity feed = fuel suction side.
The visible bubbles are showing that air is being sucked in.
If you need to prove that the skip is due to air bubbles entering the injection pump, follow the attached graphic.
The red is a temporary new fuel feed line, blue is an in line fuel filter.
Oops, corrected the colors, thanks.
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