Well I gave up and had a local shop that specializes in Volvo's do diagnostics on it, the conclusion was a bad new fuel pump assembly. They were able to catch it when the fuel pressure dropped to see if it was getting a good signal as well as voltage to the pump. They also tested all of the grounds ...

Well I took it out again after checking all of the connections, as per usual it would start out at 58 PSI, this time the fuel pressure drop down to 9-10 PSI and would not recover until I would shut it off and start it back up.

Here is the background, it is a 2005 XC70 with 191,xxx miles.


Seven months ago I replaced the fuel pressure sensor due to loss of power and misfire issues when the car was acting like it was out of fuel, the car did not throw a code at that time. All was good up until about a month ago, the same ...