Changed motor in 2007 cobalt won't start

40

Asked by Apr 14, 2012 at 11:13 PM about the 2007 Chevrolet Cobalt

Question type: Maintenance & Repair

I put a motor in 07 cobalt it cranks but no start I don't hear fuel pump priming..will run if I pour gas in only a few
seconds help please..I changed crank sensor

6 Answers

90,055

It runs while you add gas so it's not getting gas. Check the fuel pump fuse and relay first. You should hear it running for a few seconds when you turn the key on.

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Copy that I did not hear it....will check fuse and relay tomorrow... Could I have maybe put a ground wire somewhere wrong when putting new motor back in...also while problem solving earlier before I changed crank sensor I took off the old fuel rail and put it on the new motor ...is there a fuel reg on the fuel rail?thanks for your help

35

Here is how i would diagnose this problem 1. Fuel pump/filter fuses 2. Fuel pump/filter relay(s) 3. Turn on car and listen for fuel pump whining noise (good means its working) 4.Check Fuel Filter (open up a little and start car see if gas comes out) 5. Test Pressure on fuel lines with gauge 6. Check Grounds

1 out of 1 people think this is helpful.
40

Sounds good fuel pump worked before I took motor out.thanks

1 out of 1 people think this is helpful.
40

Question the car set for over a month with little to no gas in it could that harm the fuel pump? The car will run when u pour a little gas in the throttle body but dies..I checked the relays switched with a good one no help ...gotta be the fuel pump right I do not hear it prime when I turn the key...

2 out of 2 people think this is helpful.
40

Thank you to whom ever replies. This has really been a nightmare. Been doing this in the mornings, then going to work 10 hr shift I'm a welder fabricator not a mechanic.this is the 3rd motor in this car nothing but problems.first time insurance paid for motor and I took to a shop. This time me and my buddy are doing it.fun fun thanks again I'm reading that I'm not the only one with problems with my cobalt.

1 out of 1 people think this is helpful.

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