I've searched and searched, but with 20,000+ threads to read, I'm not having much luck. I'm trying to get a ball park on what my stock tbi injectors should be? This is for an 89' 4x4 suburban with a 350. What should the stock fuel pressure be and how do I hook a gauge in to find out? How do I make my tb adjustable as far as fuel pressure goes? I'm going to start the tuning process, but want to bump my fuel pressure as much as I can from the start. I've read this is the smart thing to do. Thanks

 

check the color code on them and then post the colors here. youll find the color code on the top two nail looking things from the injectors

 

It looks to be orange.

 

www.cfm-tech.com has pressure gauges and adjustable tbi fuel pressure. I have not done this yet but I thought I would pass this on.