New member 2nd post

[Bill R 0477]

2012 ram 1500 5.7 liter . Cranking but not always starting. I posted this yesterday and got some great responses. Thank you. I can't find the particular thread. But one guy suggested check to see if fuel pump running after key off it does had to disconnect neg. Cable to stop. Reconnected battery then checked voltage across fuses 22 and 33 no voltage. The guy who suggested this didn't say what if anything this would tell whats wrong. Any suggestions thanks in advance

 

[Daw14]

Vertical visions .com makes a fuel pump relay jumper. It sounds like it’s stuck on . Tipm bypass

 

[Marshall]

Change the relay would be my suggestion

 

[demonram]

Change the relay would be my suggestion

Yeah, sounds like a normally open relay that's stuck closed. Pretty simple to fix with a new relay.

 

[G-Ride990]

2012 ram 1500 5.7 liter . Cranking but not always starting. I posted this yesterday and got some great responses. Thank you. I can't find the particular thread. But one guy suggested check to see if fuel pump running after key off it does had to disconnect neg. Cable to stop. Reconnected battery then checked voltage across fuses 22 and 33 no voltage. The guy who suggested this didn't say what if anything this would tell whats wrong. Any suggestions thanks in advance

Here's your original thread. If you click your name on the top right and then click, "your content" you'll find your other post.

New to forum I have 2012 Ram Bighorn quad cab 5.7 Hemi.

My 2012 ram is having trouble starting. It will crank but not start at times. It's intermittent. Some times it will fire right up. Other times it takes 4 or 5 times. Took to my mechanic. No past or present codes showed up. They said the fuel pump needs replaced. Estimate approximately $1100...

www.ramforum.com

 

[Jeepwalker]

You can buy a bypass cable on Amazon or ebay too for about $10. Or the most elegant solution for DIY-heavy guys ...get an exact replacement relay HERE, and re-solder it to your truck's computer in place of the existing FP relay (assuming that's the issue). It's more work though. There are instructions how to ...on the internet/youtube.

If the FP is coming on but not starting, then check the fuel pump pressure regulator back below the brake booster. There are useful Y/T videos how to check/swap out.

Other possible causes:
-Intermittent fuel pump,
-Fuel pump/tank wiring,
-Bad ground/s back by fuel pump,
-Corroded TIPM trace,
-Rodent-chewed wire/s
-Corroded TIPM harness connector pins.. esp being from IL.
-Something heretofore not listed