Engine not firing up

TMCINTOSH11

MEMBER
2006 DODGE CHARGER
5.7L
V8
2WD
AUTOMATIC
289,000 MILES

So, one day my car drives and runs normally with no issues and I park it for 30 minutes and go to start it and it won't start. It cranks over just fine, and it tried to fire but nothing close. I'm really leaning towards the fuel pump; I know it has two pumps that are under the rear seat with I believe the primary pump being on the driver's side. So, tomorrow I'm going to have someone turn on the ignition and I'm going to listen for the pumps to make a noise. I don't know if both pumps should make a noise or just the primary. It currently sits at 1/4 of a tank of gas and some are saying to put it at passed half a tank and it could fire up, not sure if that'll work, but I've heard someone having a problem once were once the tank was under half it would stall because of one of the fuel pumps. I also noticed that the fuel regulator on the fuel rail doesn't have a valve so I'm curious as to go about testing fuel pressure. Thanks in advance!

4 Replies

TMCINTOSH11

MEMBER
176 POSTS

Update: I did some testing and the first test I've done is I took the back seat up and listened to see if there was any noise coming from the pump as I turned the ignition, I heard no noise of any kind, next I had a friend spray starting fluid into the throttle body as I was cranking it over and it did try to start, then I checked the fuse and relay and they both checked out, so now I'm wondering if I should go ahead and think about replacing the primary fuel pump, what do you guys think?

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Sunday, April 10th, 2022 AT 3:43 PM

KASEKENNY

MECHANIC
18,907 POSTS

Sorry for the delay on this but we work from oldest to newest so when you updated it, it put it back to the bottom of the list. However, normally we get to you quicker, so I am sorry we took this long.

As for the issue, this could be a pump issue, but we need to start with removing the relay and jumping the relay to find out if the pump comes on.

If it does, then the pump is most likely not the issue.

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

I am attaching the wiring diagram below for this and that will show the relay that we need to jump the pin 30 to 87 with the key in the on position and find out if the pump comes on.

Let me know what you find with this, and we can go from there.

Thanks

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Sunday, April 10th, 2022 AT 7:14 PM

TMCINTOSH11

MEMBER
176 POSTS

Thanks Kenny, I looked up the fuel pump relay location in the fuse box in the trunk and swapped it with one next to it and nothing changed, I also checked the fuse for the fuel pump.

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Monday, April 11th, 2022 AT 8:33 AM

KASEKENNY

MECHANIC
18,907 POSTS

Okay. That is great. So, we know it is not a relay issue but let's remove the relay and use a jumper wire to turn the pump on and if the pump comes on then we are dealing with a control issue.

However, if the pump still does not come on then the pump is most likely the issue. Let me know if you are not sure how to do this.

Thanks

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Wednesday, April 13th, 2022 AT 8:28 AM