U can do it ur self! Buy fuel press gauge. Cut gas line (out from fuel filter) in half. Get T fitting to hook up gauge. If like mine ($24.95), will reach (barely) windshield (under windshield wiper arm. Support with plastic or wood scrap to prop up gauge, so you can see it thru windshield from driver's seat.
Like they said, 26-30 lbs when vac line attached, 34-38 lbs when you pull off (tiny) vacuum hose (passenger side rear of engine, near fuel rail). When driving, fuel pressure will vary from 26 to 38 lbs pressure (has to do with vacuum loss at high speeds?)
I drove for about a week, to see if fuel pressure would vary (drop) significantly when my intermittent rough idle problem or high-speed shuddering surfaced. The problem showed up, with no change in fuel pressure. You can do the same, if U want!
Good Luck! [I'm doing the same with a vacuum line now, to see if it's the problem. I'm also waiting for another member to swap MAF sensors to see if that could be the problem.]
__________________
Jim
1995 Laguna Blue SVX AWD L - 240K (daily driver) -
"ReBuILT" used engine at 236K miles (6/13)
2013 Veloster Red - Driver Now??Dropsprings [1/2" rear, 1" front] with Koni Strut Inserts> Magnaflow Exhaust System>
ECUTune Stage 1av1 Upgrade (from 1v4)>
ECUTune TCU MOD> Aluminum Crankshaft Pulley> Stainless Brake Lines> Phenolic Spacers>
Perforated Brake Rotors (dint like, OEM now)> SmallCar Shift Kit (resting since TCU MOD)> 7-Position Ground System>
High-Pressure Fuel Pressure Regulator (resting)> ATF Cooler & Campaign Filter> Yellow Polish Polyurethane Bushings> Pioneer Double-DIN Stereo with JL AUDIO Speakers>
Driveshaft Rebuilt with C-Clip U-Joints>
15 Min MOD>
20 Min MOD .. . (2011)
Valentine One Radar Detector with Remote Display - ucan'tseeme! 