2013 Bighorn starting problems

[Dunkster71]

Ok, new to this forum but I have a 2013 bighorn 5.7hemi. I went to start truck after sitting all night and it seemed to crank over longer than usual but started with no code..if I shut truck off and start it right away it starts fine and drives fine...if truck sits for an hour or so it’s back to cranking over longer but always starts...I figured it might be the fuel pressure censer so I changed it and still the same...My fuel pressure is 399kpa running and my battery is reading 14.7v running,truck shut off is 12.8v...could this be a fuel pump relay? Or a fuel pump? Thanks Dunk.

 

[jws123]

It reminds me of what my jeep wrangler use to do it would take long to start but start every time then would start right up unless it sat for a bit . The fuel pump regulator in fuel pump assy was bad and would let pressure bleed back when it sat. Next time you cold start it prime pump turn key 3 times Not turning engine over then start it see if it starts quicker. If that works then just replace fuel pump.