Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!
Hey guys. 2006 Lincoln navigator with the 5.4L 3V in it. I'm getting a fuel smell upon startup and maybe 5 min in to the ride, more noticeable with the heat on. I have a smoke machine as well as a bi-directional scan tool but I haven't been able to find the leak...I used the smoke machine on it via the purge valve lines on both sides but haven't used it with the scan tool (I just got it not too long ago). What are your thoughts and what's the simplest approach to finding this leak?
I find on a lot of Ford vehicles that the purge sticks intermittently. Just experience. I would start with a vacuum gauge and cycle the purge solenoid on and off and see if you can catch it sticking.
Making Pressure Differential Sensors (PDA Sensors) for pressure pulse diagnostics.
Currently servicing Central Texas.
Did you check to see if any charcoal was in the line?
Try an evap purge and canister vent while monitoring in tank pressure. Pretty sure the voltage should be at about 2.5v for fuel pressure sensor. Close canister vent valve, Use purge to pull it into a vacuum till the pressure sensor drops about 1v then turn off the purge valve and see if it continues to build vacuum. Should really help narrow down where your problem is.
Making Pressure Differential Sensors (PDA Sensors) for pressure pulse diagnostics.
Currently servicing Central Texas.
Topic Author
