Had to make a quick stop at the house, got back in truck to leave and all it does is turn over but wont start. Anyone have an idea where I should start looking. Was running fine before I stopped.

 

Ok I checked my fuel pressure at the fuel rails and have none. Is this a definate fuel pump since it just stopped all the sudden or is there a relay or somethingelse I can check before dropping the tank?

 

Here's my post on the same problem, it did turn out to be the fuel pump but this post shows what SSCULLY suggested I check before I did the tank drop, even have a picture of the fuel pump relay fuse and how I checked it. Good Luck and be careful.
mp

https://www.f150online.com/forums/sh...d.php?t=256178

 

Thanks a bunch I will try that first.

 

I went out and tried a few things that were on that post. When ignition is turned on you can hear the fuel pump kick in for just a sec but when I depressed shcader on fuel rail there was a weak little drizzle of gas come out and then stop. Could this be a fuel filter? I didnt think it could be that cause it seemed to run fine before I stoped the last time, or could it be that the fuel pump is coming on and just to weak to pump the right amount of pressure?

 

1) what year/make is this vehicle?
2) Did you at any time run the vehicle for a while with the "Low Fuel" light on?
3) when was the last time you changed the Fuel filer or how many miles do you have on the truck.

Did you try the bump the bottom of the fuel tank trick? for me it did not work.
but for others it did.

Here's what I found out after I removed the tank:

I ran it for a while with the "Low Fuel" light on and eventually the filter on my fuel pump came off and plugged it up. But before just getting solid crank with now fire it would fire up occasionaly.

I think SSCULLY might be of more assistance here. Your getting some fuel to the schrader valve, on mine it was not. You could check the fuel filter but I'm not sure that's your problem, the cost of my fuel filter was 15 bucks plus the 12 bucks for the fuel line tool VS the 103 it cost for the fule filter.

Sorry I'm not much help here.

 

Its a 99 F150 with the 5.4. For the most part I dont let it get below 1/4 of a tank but it was just above empty when this happened. The truck has 180,000 miles on it but just had a new motor put in at the beginning of the year. I went a head and got a new pump and filter today. It seems all signs point to the pump, and with that many miles its not surprising it went out.

 

Ok I changed the fuel pump and filter. Now it will act like it wants to start for a second but doesnt. I can hear the fuel pump come on and there is pressure at the schrader so I am guessing I have a different problem. I saw the throttle body was dirty so I sprayed it with b-12 and cleaned the crap off of it. Tried to start it afterwards and it started backfiring threw the throttlebody. Not sure what to check next, anyone have a clue what direction I should go now?

 

opps, wrong thread

 

anyone have the slightest idea??

 

About 3 or 4 months ago you posted a 1309 OBD II Scan fault , you said it was missing at about 2000 rpms. I haven't looked it up yet but 1309? Alright found it - 1309= Misfire Monitor Chip fault. What did you do about that problem? Has your motor been misfiring at all before this happened. You PCM might have shutdown your injectors. 1309 is a serious problem , so what happened there?

 

If you are having backfires through the intake, that may be a very serious problem. You should never, ever have an intake backfire. It may take a fair amount of cranking to get the air out of the fuel system, but once that's done, it should start. If it doesn't, you either still have a fuel delivery problem somewhere, you have a problem getting spark, or you have a more serious internal engine problem (like a hung valve which would cause the sneeze). Check to see what the actual fuel pressure is, and you might want to do a compression test while you are at it.

 

To prime any Ford FI engine: Cycle the ignition on and off at least 6 times. (Do not crank the engine). This operates the fuel pump each time and pressureizes the system without cranking and filling the cylinders with gas.
Use this method after running out of gas and refilling.
Cranking the engine without it starting floods the cylinders with gas and can insures a no start condition. The injectors still work even in absence of ignition.
To clear cylinders of gas fouling, go {wide open throttle} and crank engine. This "shuts the injectors off" and the engine may start when the fuel dries enough providing there is no other fault.
This is because the TPS at WOT position signals the PCM to shut the injectors off before self starting has occurred. This is not a normal mode to start the engine and is a protection and trouble shooting of sorts, from run-away conditions.
You have to take care not to get into a flooding condition while working on the engine or you get fooled.
After spraying cleaners in the intake tract, it may be hard to start the engine until it has dried enough while cranking.

 

The 1309 code I had was cleared out and the only code that was present when it stopped was 0402 exhaust gas recirculation flow excessive. It still has a mis sometimes right at 2000rpm usually when running about 70 mph on the highway. A friend of mine that is a mechanic looked at it and found a vacuum leak in the elbow after the pcv valve and told me that could cause it to mis when the engine was running with no load. Has ordered the part and when it came was the wrong one so had to reorder. For some reason he hasnt got it yet. Could this be the PCM is malfunctioning and finally shut down?The mis is real wierd in the fact that it does it at 70 mph but if you are at 65 or 75mph it doesnt happen.Im not a mechanic and my friend is more of a general mechanic (has a muffler/mechanic shop) so he doesnt know enough about this truck or motor to be much help it seems.

 

After sitting for awhile the air works it's way out. What hasn't been mentioned above after three of four good attempts with a new pump especially it's a good idea to bleed the shrader once or to just let it sit for a bit. Been there done that after an injector replacement , you'll get absoluty nothing on one attempt - give it a rest and it fires right up in 1/2 hour or so.. New fuel pump so follow what Blue said about priming and also keep in mind your injectors have to be on the dry side as well. You wouldn't think injectors should take that long to fill with fuel , they do because your PCM won't give it all to them at once lol - it's true...

Behind your pasenger side kickpanel theres whats called an inertia switch with a reset button , If you can push the button down any , than that was most likely the problem. You said you heard your fuel pump tho , so it may be fine - check it to be sure.

The way you said it stopped running on you sounded likeit could be a fuse you blow fuses on startup commonly..

Hope you get it goin , be patient and don't overcrank ( :

Good luck.