So I’m stumped and need a little help my 04 Rubicon 4.0 automatic was running fine one day then nothing I know I’m not getting fuel but I have checked relays fuses and even replaced the fuel pump but still nothing cranks good but don’t hear the fuel pump at all any help will be greatly appreciated thanks.
Cranking but no start
- Thread starter nightwing434
- Start date
Check the fuel pump's connector on the front-driver's side of the fuel tank holder. Power to the fuel pump passes through it so put a meter onto the dark green wire with white trace, that's where the fuel pump receives power from the fuel pump relay. That voltage remains there only 1.8 seconds after the key is turned on so you'll need a helper. Also try swapping the fuel pump relay with any other relay of the same size inside the power distribution center. Then try the same swap with the ASD relay which is also the same type of relay.
Were you able to figure it out? Cranks great but no fuel on my 04 Rubi. Changed the crankshaft position sensor from a recommendation to no avail. Tried the horn relay swap so that isn't it. Week before had to replace the alternator. No hard starts prior to it dying while going 70 down the highway. Just filled up on fuel a day before it died so not looking forward to dropping the tank.
This is why it is good to carry a can of starter fluid.
A quick spray in the air box will tell you if its a fuel problem or electrical to the fuel pump.
If it is a fuel problem clean the block ground by the battery first.
This will ensure you have a good ground.
A quick spray in the air box will tell you if its a fuel problem or electrical to the fuel pump.
If it is a fuel problem clean the block ground by the battery first.
This will ensure you have a good ground.