where can I locate the pressure sensor for the fuel system and how can I tell if its bad.

Asked by Oct 19, 2014 at 02:08 PM about the 2004 Mercury Grand Marquis LS Ultimate

Question type: Maintenance & Repair

2 Answers

148,655

What engine?

148,655

OK 4.6 There is a schrader valve on the fuel rail, can't post picture it's copyrighted and will get deleted anyway. Looks just like a tire valve, get hold of a fuel pressure tester gauge and should have 35 psi minimum. If it's lower, either fuel pump, filter or regulator is bad.

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