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I finally figured out why those inline injection pumps keep sticking on the Bosch P7100s
I've been turning wrenches on diesels since 1998 and I kept seeing guys swap out perfectly good injection pumps just because they wouldn't return to idle right. It's not the pump itself most of the time. I worked at a shop in Tulsa for 5 years and we'd get trucks towed in where someone already threw a $1200 pump at it. Turns out it's almost always the fuel return line check valve getting clogged with that black gummy varnish from old diesel. I cleaned one out with brake cleaner and a pick last week on a 1994 Ford 7.3 and it ran smooth as new. Who else has seen people throw parts at a simple fuel system issue?
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james_ross21h ago
Had a buddy put three pumps on one truck before finding a kinked fuel line.
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jamieburns12h ago
Honestly, "three pumps on one truck" - was he just throwing parts at it hoping something would stick, or did that kink totally hide itself during the install?
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