This' ll be a long post but bare with me for specifics. I'm currently sitting at or just about 152,653 miles. around the 145k mark I've been noticing a random hard start in the ( cold) mornings. I didn't think much of it since it only happened on cold starts. Now I'd say around the 150k to now I've been footing the pedal just to get it to start in mornings or if it sat to long, say when I got off an 8 hr shift . So far I have checked the Mass Air Flow, purge valve sensors, all seem to be functioning properly but sitting at 150k I went ahead an put new sensors in. I also replaced the driver module and tried to start it up and it wouldn't even crank over so I put the original M.A.F,& purge sensors AND Driver module back in and it fired up after cranking and "yep" footing the pedal once again. So, after all that I thought well maybe It could be just the simple fix in fuse #27 that I heard so much about constantly blowing. NOPE, fuse 27 is still fine, so then I checked if it was the pump, had my girlfriend sit in the truck and put the key to the ON position so I can stand next to the filler hole to listen to it buzz, The buzz goes off for the 2-3 seconds but i had her do it twice the other day with one buzz so slight of hearing it you literally had to jam your ear in the hole but the next day I heard it buzzing loud and clear yet still it was hard starting. Always ran good after start up to.
What could be the problem?
You think the pump is slowly going? I'm out of options guys, LOL Thanks for the help

 

If you suspect the pump, attach a fuel pressure gauge to the fuel rail and watch what happens when you turn the key on. It should get up to 40 psi after at most two key on/off cycles, and hold. Then start the engine and see if the pressure stays at 40 psi when you pull the vacuum line on the regulator. What would be best would be something you can see from the driver's seat, so you can watch the pressure as you put load on the engine, such as driving up a slope, maybe with a load in the truck. That will tell you if the pump is strong enough to maintain pressure under load, and not just at key-on, or engine idling.

Usually, if the cars sits for a long time, and the fuel pressure bleeds off, the first time you key on, the fuel pump will make a particular sound as it pumps up the lines. The second time, since the lines should be pressurized, the pump should sound a little different, usually a little slower since the load has increased.

 

I'm at a loss here . The only thing i can think of is maybe the PCM or try a different brand of Driver Module ( dorman) i bought initially. Do you happen to know where the schrader valve is on the fuel rail? I can not find it

 

I think you would have better luck in the correct forum. There is no Schrader valve. You said you replaced the purge sensor? Did you mean you replaced the purge valve? The purge valve will give the same symptoms as you describe. FYI holding the throttle down while cranking puts the truck in service mode and shuts off the fuel injectors, throttle body and spark. This makes me believe you do have a vapor purge issue and are simply clearing the vapor flooding condition.

 

Yes sorry, the purge valve i have replaced but put the original back in. i will find the correct forum link

 

Sorry for my confusion; I didn't realize the implications of the 2011 model year. I thought you were talking about the classic SBF.

You want the Coyote discussion group.

https://www.ford-trucks.com/forums/forum247/

 

Thread moved. Thanks