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02-19-2013
need some help with a 99 pontiac grand am gt H.O. 3400 sfi. Its starting rough due to low fuel presure. it has a new fuel pump and the fuel lines have all been ran through. and for some reason all of the lights on the dash are on. Feel free to leave any advise thanks
02-19-2013
Junk pump replacement?
You said the lines have been ran through, assuming you have a new fuel filter as well?
Maybe there is a clog in the rail or...start checking fuses/relays/wiring to make sure its getting a solid connection.
Also, this section is for the 3.4 DOHC...I'll move it for you
02-19-2013
Did you replace the fuel pump?
Is it running rough all the time, or just idling?
Does it cut out when driving?
What all codes are showing up?
(Go to a close auto place, they have scanners you can use for free to check codes, write each down Pxxxx - description, come back and well go from there)
Originally Posted by AmericanSoldier
02-19-2013
Bad Fuel pressure regulator can cause low FP at start up too.
02-19-2013
Yeah check fuel pressure reg.
02-19-2013
its just when your starting it and yes filter and pump are new and thanks ill look into it now
02-19-2013
I had a problem getting a 3100 running at start up and it was a lazy fuel pump. It's possible you got a bad one.
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