My 98 V70 XC doesn't want to stay running. I've read a lot about access to the Fuel Pump and need to fix the sending unit anyway, but I was wondering about the FPR as the car sat for a long period (a couple of years), and when I pulled the fitting off the output side of the new filter I installed last year, it pumped like crazy. There seems to be no pressure at the rail.
Question: Is the fuel pump working but unable to sustain pressure against the manifold a likely failure mode?
I did replace the plastic vacuum tee with a soldered metal one that Volvo now makes, and when the failure occurred I noticed that the rubber elbow for the hard vacuum line at the intake manifold had failed (I replaced it).
I pulled the Fuel Pressure Regulator out of the little plastic cup and sprayed some carb cleaner in there and pulled a vacuum with a mighty-vac on the vacuum side while spraying the cleaner down the center stem. I didn't see any fluid going through the thing even with a vacuum pulled on it. That is what makes me think the FPR may be bad. Well..., that and not wanting to screw with the pump if I don't have to.
Thanks!
John Gregory,
Portage, MI
