i have a 92 rs with a 305.Is there any way to check the fuel pressure on a tbi as you adjust the pressure.can i put a guage on it some how.

 

Yes, you can. I have seen some different designs of TBI fuel pressure testers, but one design seems to be the most common. This kind is what you will find at most auto parts stores, which includes a brass fitting that goes in between the larger 3/8" metal fuel line and the rubber fuel line near the alternator in the engine compartment. Just look for an "Actron TBI Fuel Pressure Tester" at the local auto parts stores for about $40.

Here's a link to it: http://www.actron.com/product_detail.php?pid=16175


Or, another slightly cheaper option, and if you don't mind that it's permanently installed, is to just buy a 3/8" gauge fitting hose and a small fuel pressure gauge with a range of at least 0-15 PSI. you can get them from a place like Summit Racing or Jegs

Here's a picture of mine, Summit Racing part numbers SUM-G1710 and SUM-800130:


I would not recommend doing what I did, though. Those liquid-filled gauges are affected by temperature, and once the engine gets hot, the gauge becomes inaccurate.

 

I went with a inline gauge as described above. I got a 0-30 psi liquid filled one. It does what I need it to do. They cool off quickly, so it's accurate enough for me. It probably helps that the entire top-half of my engine is aluminum and the headers are ceramic coated. I imagine if it was mounted directly above cast iron exhaust manifolds and next to cast iron heads that it would get pretty hot. But I've never been playing with my fuel pressure w/o having the hood open and the car not running for 20 minutes at a time.

 

will this read the pressure after the regulator.so that when i adjust it i can measure my adjustments

 

No. It goes in the feed line. When you make adjustments on the regulator, you'll notice the difference.

 

Got a question about fuel pressure...
Since I have had my car it has had extended cranking before start-up, and the pressure does not hold after the car is off. I assumed that it was the check ball in the fuel pump.
I have the Actron Fuel Pressure Gauge setup, and when I block the return line, fuel pressure holds. I have also made my regulator adjustable. I adjusted the regulator to increase my fuel pressure. When I started car, and saw no change in fuel pressure. Then, thinking that I must have adjusted the regulator the wrong direction, I turned it all the way back down (least resistance). This also provided no change in the fuel pressure after engine was started. (9-10psi and new fuel filter)
Any idea as to what is going on?