Truck cranks but not starting

Tiny
JORGE MARTINO
  • MEMBER
  • 2009 DODGE RAM
  • 3.7L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 145,000 MILES
Hi, I have the truck listed above 1500 model. I stopped at the stop sign and the truck shut off with out a warning. Battery is good. Truck cranks over really hard but does not start, the fuse M22 which is the fuel pump relay fuse has current with truck of and on. When I turn the key to on position I cannot hear the fuel pump to start running. Do you think is the relay? Do I need the relay bypass kit? Or is it the pump that fail? Please help. I will appreciate. Thanks in advance.
Saturday, August 17th, 2019 AT 3:15 PM

3 Replies

Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Hi,

This doesn't sound like a fuel pump issue. If you hear the fuel pump come on, then we can assume it is ok for now. We may need to come back and check it but let's move onto spark first. The reason is, a fuel pump that shuts off normally does not cause a quick shut off as you described. It sounds like the ignition is cut off causing it to shut off.

I would pull a spark plug and hold it against the block and crank the engine and see if you have spark.

Plus, the fuel pump fuse is hot at all times so it makes sense that you have power even with the key off.

Let me know if you have spark and we can go from there. Thanks
Was this
answer
helpful?
Yes
No
Saturday, August 17th, 2019 AT 6:07 PM
Tiny
JORGE MARTINO
  • MEMBER
  • 2 POSTS
Hi, thanks. I do not here the pump to come on. It there any way to scan this? A scanner will tell me the issue? Check light is blinking but not steady on. How can I check for sparks?
Was this
answer
helpful?
Yes
No
Saturday, August 17th, 2019 AT 10:32 PM
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Sorry, I misread that. I thought you said you did hear it come on. This could be a relay if you have current going to the pump but the pump does not come on. You should have another relay in the box that is the same. Just try swapping it with another and see if the pump comes on. If not, the best way to check for spark is to pull a plug and hold it against the engine block while the engine is cranking.
Was this
answer
helpful?
Yes
No
Sunday, August 18th, 2019 AT 4:20 PM

Please login or register to post a reply.

Related Engine Not Running Content

Car Cranking but Not Starting? Try This
VIDEO
Car Cranking but Not Starting? Try This
Instructional repair video
Engine Not Starting
GUIDE
Engine Not Starting
Over the past 20 years at 2CarPros we have identified the top problems that are easily fixed. This guide can save you a trip to the repair garage or calling a tow truck and...
VIEW MORE