Taurus Car Club of America : Ford Taurus Forum banner

21 - 24 of 24 Posts

·
Registered
Joined
·
13 Posts
Discussion Starter #22
Now that the warm weather has returned, I thought I'd pop back in and say that the problem persists. Just can't figure it out. It's still vapor locking and throwing the fuel rail pressure controller code. We've replaced just about everything fuel-related except for the lines themselves.
 

·
Registered
Joined
·
13 Posts
Discussion Starter #23
Well it's still not fixed. It's getting worse, actually, which may point us to something that will fix it. I dunno. Since I posted last, my dad got an '06 Taurus. It has the 3.0, but not the DOHC that the Montego has. I was goofing around with them yesterday and plugged a scanner into them. The Taurus has a target fuel pressure of 40 PSI, and actual fuel pressure right around 40 PSI. The Montego also has a target PSI but only has 20 PSI (at the most) at idle. My dad's original theory was that vapor lock was causing high rail pressure and fooling the PCM into thinking it had the pressure it needed and was slowing down the pump. I think it's the opposite. The pressure is too low to stave off vapor lock. But why is it low? The pump and every piece of electronics related to the fuel system has been replaced.

At this point, we're thinking it's a bad aftermarket pump. We're going to install a new Ford pump and see what happens. It's an expensive crap shoot, but we don't know what else to do at this point.
 

·
Super Moderator
Joined
·
7,802 Posts
Years ago I had the line from the fuel pump to the tank flange in my long gone 91 Escort develop a small split in it. This in turn caused random drop outs in fuel pressure especially under high fuel demand conditions. That was a troubleshooting nightmare. After exhausting every other possibility I dropped the tank and removed the pump / flange assy. The split in the line was obvious on close inspection. Not saying this is your problem, but it is a possibility.
 
21 - 24 of 24 Posts
Top