Bobby patterson

I have 06 f150 with the 4.6 and I keep getting the p0191 code multiple times a day and I clear it with my programmer. It will idle funny sometimes when you start it up especially with the air conditioning on. I've replaced the fpdm a couple years ago and even tried a new one the other day to see if it made a difference and it didnt. I've also replaced the fuel rail pressure sensor. And makes no difference. The fuel pump is about 3 years old. I'm at a loss and dont know what to do next. Any help is greatly appreciated

redfishtd

Of course you cleaned all the connectors . torque pro with android phone and bluetooth reader will give fuel pressure readings .

techrep

iTrader: (1)

Bobby patterson

But yes I replaced the fuel filter as well

Bobby patterson

It seems to run normal.idling is usually what the problem is. This may have nothing to do with it but it started right after I had dual exhaust put on the truck.the driver side pipe runs close to a couple lines coming from the fuel tank but nothing's melted.could that have anything to do with it? I appreciate everybody's help

redfishtd

Thought so .
Yes I would worry about excessive heat on fuel lines causing all sorts of problems . I would shield lines /pipes to block heat can't hurt to do that . Hose clamps and alum shields .

Bobby patterson

The lines that they run close to come from the fuel tank and run to the canister in the back of the truck.so I'm not sure if it would actually effect those.but it's just weird that the same day the exhaust was done it started doing it

David Carlson

This thread is very interesting. I have also changed virtually everything and still have the dreaded P0191. How did this end?

Jojodapyro

Just about a year ago.

MyTruck87

I have the same problem,on a 2005 f1-50,,replaced, the fuel pump, and pigtail,fuel pressure sensor,fpdm,fuse box, and still only have half the fuel pressure I should have,fuel pressure and voltage drop on acceleration.any ideas? anyone?