replace your fuel filter.

 

i'm looking into getting a walbro right now... 190lp or 255? 190 should be plenty for my 300 goal right?
Is there a major difference with the high pressure unit and low pressure unit?
another thing, i heard that guys are burning up 255ph pumps by running gas tank below 1/4 tank? I'm a student so i occasionally have to run it down to "E."

I'm running t3/t4 50trim

I thought about the fuel filter, but i just replaced it 2-3 months ago... its a possible cause i guess since i like to run my car down to empty.

the season is over and i'm gonna be parking the car for winter soon so... i guess figuring out what is causing this will give me something to do over the winter.

 

Keep in mind the cooler temps this time of year can result in a more dense intake charge
Other than that I agree you may want to run a larger gauge wire to your fuel pump or possibly upgrade it

 

do you still have the stock map sensor? soudns like it is a stock one wich is leaning you out over 11psi. don't know where i heard that but i think i read it on either HT or pgmfi. check it out

 

2.5 bar map sensor