i just put a lt4 hot cam in my 94 z28 and it wont run right i dont think its getting enough fuel it has stock regulator but 30 lb injectors 255 pump is stock press to low for the cam(it ran b4 swap)

 

Easy way to find out would be to hook up a fuel pressure gauge.

 

what is stock press supposed to be

 

In the 41-47psi range. Here is a tutorial courtesy of Shoebox: http://shbox.com/1/4th_gen_tech2.htm...essure_testing

 

thanks do u know what i should set the press for with the cam

 

There is no pressure adjustments to be made with a stock FP regulator. If indeed your fuel pump cannot keep up with demand, then you will need a new pump.

 

i was thinking i might need to get an adj press regulator it has a new 255 pump

 

Its pretty well known that the adj. fuel pressure regulators are a waste of money and often cause more problems then they are worth. If you are indeed having fuel delivery problems, an adjustable fuel pressure regulator is only trying to offer a band aid to a more serious problem. What are the symptoms that the car is experiencing that makes you believe you are having fuel problems?

 

its trying to start and will run for a couple of secs then die i know its not spark or compression ive checked both(takes an extremely long time to start like 6 full engine rotations)

 

All of this started right after the cam install? Are you sure you installed the timing chain and optispark correctly?

 

positive b/c it ran fine for a couple of days

 

yes it all happened right after cam install

 

I would hook up a gauge and still double check the fuel pressure. It isn't uncommon for the check valve, which maintains pressure in the fuel rail for starting, to get dirty and stick open. This in turn causes the fuel pressure to bleed off quickly causing hard starts.

 

ill give it a try thank u very much