CM870 Fuel ump

[Nilao]

Not knowing what type truck I'm going to throw my opinion into the ring....my truck uses voss fuel fittings. When its super cold outside the plastic contracts at a different rate than the metal fitting it connects to. This allows the fitting to suck some air after they get some age on them. The orings get hard and won't take up the larger gap anymore. If your fuel line are quick connect like mine you may need new orings...