If pressure is dropping that fast most likely either the check valve on the supply line in tank is faulty or the fuel reg is faulty ; both will bleed pressure straight down.it stays at 40 for about 2 seconds then goes right down to 0
That would be good for if the regulator diaphragm ruptured. If the spring is weak it will seep off but not show in the tube.El☠Diablo;1849055 said:this is what i did to see if it was my fuel pressure regulator , i turned on the car , then went over to the vacuum line attached to the regulator and disconnected it while it was running , and saw that it was spitting out fuel , give that a shot , if not then check your plugs . another way i found out to check for a leaking fuel injector i drove the car for about 15min then came home turned it off took off the rubber tube that goes from the throttle body to the filter , manualy opened the throttle and listened inside the throttle body and i heard dripping and sizzling drip and sizzle , found out that my #1 injector was leaking , just a couple ideas if you dont have the specialized tools .:thumbsup:
You don't crank, it don't spray.:WTF I pulled the injectoers out and turned the ignition on. nothing happened.
puled the vacumn line of the reg. and turned the ignition on. nothing.
seen how I shou;d pinch the fuel line and see if check valvs is bad. how do you pinch the lines?
and is thr check valve in the fuel pump
You need to access the two rubber fuel lines , possibly at front of fuel rails or by removing the filler door and rubber boot to get to lines where they enter tankthere is a return line leading to the fuel tank that is rubber. .
I can't be sure. I have rubber fuel lines but I also have a HSR. I don't remember what the stock system was like but thanks for advising him.You need to access the two rubber fuel lines , possibly at front of fuel rails or by removing the filler door and rubber boot to get to lines where they enter tank
Pressurize lines ( can put 12V direct to terminal G on ALDL connector , pump will run without key on ) , stop pump and watch gauge to see if pressure changes, then do other line