2008 DTS cranks but will not turn over

Asked by Dec 01, 2016 at 02:35 PM about the 2008 Cadillac DTS V8

Question type: Maintenance & Repair

I have a 2008 DTS Caddy.  My son Dylan and I replaced the fuel pump, the fuel
relay, fuel fuse, and the car still only cranks and does not turn over.  

Plenty of juice in the battery and there are no codes that come up on a scan.

I would think that there would be a code if it involved injectors?

There has also been a humming sound for about a year that friends or
mechanics could figure out what it is.  I read somewhere recently that a bad
fuel pump can cause a loud humming noise.  

5 Answers

35,035

Is the fuel pump working? Normally they make a faint humming sound.

How would I test the sound? Just turn the key?

35,035

Turn the key on and listen at the tank, the pump might stop running if the fuel pressure builds up so a helper might make it easier. You can also check for fuel pressure at the fuel injection rails. There should be a small test port that is used to test fuel pressure.

cannot hear anything. it is brand new form an auto parts store. was there anything of a switch to turn on? we simply placed it into the tank.

If the fuel pump rely burned where I can see black on it and the block has burned on it, would I need to replace the fuse block even if other areas of the block are functioning? The fuel pump relay does not seem to be working the new pump I installed. The makes no sound that shows it is functioning.

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