Does a 54 reg Volvo V70 2.4 petrol fuel pump need 12v feed as we only have 7???. A few weeks ago, the car just cut out. Tried several time to start to no avail. About 3/4 hour later it started and seemed to run fine, even though it backfired a bit. Gave it a full engine service. 6 weeks ago, did it again. Again left for 3/4 hour and then started. Took to our workshop. electrical diagnosis said possible fuel pump????. As previously mentioned only have 7v. It did come up with an error message but cant remember what it was :(. Very frustrating.