The ones in the surge tank? I believe last time phunk posted about this he suggessted to continue drilling the stock fuel pressure regulator and to drill the siphon jet orifice rather then removing it. Is that your recommendation as well? Just curious so I can pass it along.

 

I believe he is talking about the two 3/8" holes the instructions say to drill on the side.

 

Correct that is the surge tank. I'm aware of what he meant in that regard I just want to confirm his thoughts on the siphon jet. Remove or enlarge?

 

That is something i would also like to know about, we pulled that yellow piece out of G thizzles car and now are wondering if we should put that back and if we should have even drilled those two holes. Seems like we shouldn't have.

 

Well I have over 60,000 miles on my car including track days both drag strip and road course and have never run into an issue with this. I'm not saying others have but I have not. Several others will say the same. Mossy Performance car saw multiple track days and never had one issue. taurran, same thing. I would never personally going around full boosting that close to empty though. Just doesn't make a lot of sense to me.

 

MIA he is running very rich and is thinking about plugging up the 2 holes that he drilled in the surge tank and putting the siphen jet back in. Would this help his rich condition any?

 

Not likely. In theory the holes in the surge tank allow for additional fuel sourcability for the pump. But I don't see that making it run any leaner.

 

I'm really stumped on this one also. He also seems to be running more rich on the drivers side.

 

so in conclusion the yellow siphon piece and the holes in the surge tank have nothing to do with fuel pressure...

Like i said before, when i was running lean i burnt out the cat on the driverside and now with the test pipes it is blowing cold and backfiring... which means i am getting tooo much fuel on that one side... which is also causing my car to shake at low idle.... which is making run too rich... sooooo confused!!!!

 

Any fuel gurus out there?

 

Might really need just a good tune, and with some bigger injectors in there it will be easier also.

 

That's not correct...it definately does effect fuel pressure.

 

drilling the yellow jet will only effect fuel pressure if its too small of a hole for the pump and isnt allowing the regulator to function properly by backing up the internal return flow.

as for putting holes in the side of the canister like turbonetics says, that is just destructive and serves no purpose other than reducing fuel control and increasingly likelyhood of pickup starvation under lower tank and higher g conditions. the only reason you would put those holes in the side is it you were not thinking straight and you completely removed the yellow jet which would kill the venturi effect that draws fuel into the can to begin with, therefore you would need the large holes so fuel has an acceptable path in... but hopefully you would have never removed or over drilled the yellow jet to begin with.

 

Now that the holes are drilled do you think we should just plug them back up?