i have a 2003 F150 4.6 L triton- replaced fuel pump fuel filter- and pressure regulator- has intermittent hard starting problem- sometimes starts with no problem- other times takes a while to start- like not getting gas or spark- was at mechanics- but still no answer to problem

 

Have you checked the IACV?

 

havent checked much yet- gonna take it in to have scanned get computer printout- go from there- thanks tho

 

why did you have so many fuel system components replaced? If the mechanic was going after something fuel related i'd check throttle position sensor, sounds like the truck is trying to start in clear flood mode.

 

Well keep us posted. I'm having similar problems as of this morning....

 

had it scanned- came up with left bank too rich- #1 cylinder misfire- ibought all new plugs and boots- replacing #1 coil pack - then go from there

 

I replaced the pump this weekend. No luck. I checked the fuse, tested the fuel pump relay in the fuse box how everyone says to (put finger on it, turn ignition on, and feel if it buzzes or clicks on) It DID. So I figured it was good. Replaced the pump, listened for it to come on and heard nothing.

Decided to change the relay even though it passed the test earlier.

That thing fires right up now!

Don't trust the relay is good because it clicks on!
I wish I would have spent that $15 before that $180 on that pump!

Good luck to you all!

 

replaced #1 coil and plug- gonna replace rest of plugs- starts ok when warmed - but still gives occasional grief after sitting all nite- so sstill not quite sure what actual problem is yet

 

i didnt have to pay for fuel pump- filter or peessure regulator- work did that for me- plus installation- i just had to get 1 coil pack -plugs and new boots

 

heyy guys, so it seems like im having the same issues you guys are. I was driving my truck(97 4.2L V6) all afternoon it was working fine. had multiple startups from a few different destinations. had her stall on me once. motor did a weird jump then stalled while i was sitting at a light, but she started right up again.

I got her back home and decided Id take a look and see if a had a vaccum line break or something, explain why she stalled. I had shut it down while I took stuff inside my house, came back out, fired it up, opened the hood and went looking, I found a split hose that attaches right under the throttle body, and runs back to the passenger side valve cover. she stalled when I moved the split hose ( im assuming from too much vaccum loss). anyways replaced that piece of hose. tried to start her again and nothing, cranks, sounds like she has spark but no fuel. the fuel pump seems to be priming. fuses are good and my fuel filter is new as of 2 weeks ago.

I'll replace the fuel relay, and check my regulator in the morning.

but do you guys have any other suggestions?