Crank no start?

Tiny
JEFF HERMAN
  • MEMBER
  • 2007 FORD F-150
  • 5.4L
  • V8
  • 4WD
  • AUTOMATIC
  • 240,000 MILES
I can hear the fuel pump prime for about two seconds. I can't test the pressure because there's no test port and I don't have the adapter. It sounds like it tries to fire with an occasional pop. I tried spraying starter fluid into the air horn with the same results. It wouldn't fire.
Wednesday, November 20th, 2024 AT 7:34 AM

6 Replies

Tiny
AL514
  • MECHANIC
  • 4,688 POSTS
Hello, this vehicle has a fuel pressure/temperature sensor on the fuel rail that can be read by a scan tool, via the live data in the PCM. If an alternate fuel source gave no results, check to see if you have ignition spark. Heres a guide to help checking for spark. The number 1 coil is very easy to get to on this truck, or any of the front coils. See if theres spark and go from there.

https://www.2carpros.com/articles/how-to-check-for-ignition-spark
Was this
answer
helpful?
Yes
No
+1
Wednesday, November 20th, 2024 AT 2:56 PM
Tiny
JEFF HERMAN
  • MEMBER
  • 444 POSTS
I found a cracked fuel rail where the #7 injector plugs in so first that has to be replaced. I'm assuming the system can't build pressure with this leak and the connector was getting wet with fuel.
Was this
answer
helpful?
Yes
No
Wednesday, November 20th, 2024 AT 4:02 PM
Tiny
AL514
  • MECHANIC
  • 4,688 POSTS
Yes definitely repair that first. Is it the fuel rail really cracked? Its not an upper injector seal leaking? Its rare for a fuel rail to crack, thats a strange fault. The 3 wire sensor on the fuel rail is the pressure sensor, if you want to check it, one wire should read 5volts with the Key On, engine doesnt need to be on. The other two wire, ones a ground and the other is the Signal wire 0-5volt signal. But let us know what you find after that repair. The vehicle has high mileage too so if the rail fix doesnt get it started check for spark, and go from there.
Was this
answer
helpful?
Yes
No
+1
Wednesday, November 20th, 2024 AT 7:08 PM
Tiny
JEFF HERMAN
  • MEMBER
  • 444 POSTS
Yes the rail is cracked, it's coming from above the bell where the injector plugs in. I've never seen one crack before either. Probably could braze it. Looking for a rail though.
Was this
answer
helpful?
Yes
No
Wednesday, November 20th, 2024 AT 7:38 PM
Tiny
JEFF HERMAN
  • MEMBER
  • 444 POSTS
I won't get back to it until after Thanksgiving
Was this
answer
helpful?
Yes
No
Wednesday, November 20th, 2024 AT 7:39 PM
Tiny
AL514
  • MECHANIC
  • 4,688 POSTS
Yeah, just replace it, sounds like it could fail in other sections in that case, factory defect.
Was this
answer
helpful?
Yes
No
Wednesday, November 20th, 2024 AT 7:53 PM

Please login or register to post a reply.

Sponsored links