Hello friends, I was hoping someone could help stear me in the right direction. 9 months ago I replaced the fuel pump and filter in my 93 mustang lx 4 cyl. The pump left me stranded a the grocery store, then the next morning it worked and I drove it back home.
Three weeks ago the car sputtered to a stop on a 25 mph residential street. The Fuel Pump wasn't working (The fuel pump gives off a very audible whine when you first turn the key). After 2 minutes or so of turning the ignition on and off, I heard the fuel pump whine and the car ran fine till today, when it happened again.
I checked the engine codes from the eec and got a 543 which means: "Fuel Pump Monitor circuit shows no power." Or another source says: "Fuel Pump circuit open: Battery to PCM"
At first I thought this meant the "fuel pump relay" was going bad, but on the 93 models the relay is part of a big CCRM box and not a cheap little switch. So it is not super simple to replace. But the "Battery to PCM" part of the discription seems to say the the problem is before the "fuel pump relay".
I would appreciate your help and advice.