Quote:
Originally Posted by RETed
I don't understand your original question...
Where did you "obstruct" flow?
Did you pinch the hose?
Where?
After fuel filter, before injectors?
Between rails?
After FPR?
Think of the FPR as a bleeder, relief valve.
If the pressure goes higher than it's setting, then it allows the fuel (pressure) to bypass.
-Ted
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My fuel Pressure tester came with a T fitting. I put one end in the hose after the fuel filter and plugged the other end... per my Haynes manual, the pump should produce 57 PSI when the flow of fuel is obstructed, in the example they ran the hosed directly into their pressure gauge but I could not configure mine this way.... I got 56 PSI during my test.
Also per the 'ole Haynes manual, I should get 35.6 - 37.0 PSI on the return line without vacuum. I checked my return line both on the drivers side where it comes out from under the TB and I checked it again directly under the FPR as it shows in the manual.. I got 0 PSI both times with the pump running and no flow obstructions other than the FPR. I even opened the pressure relief on my tester while the pump was running and got nothing coming out.
The problem is that when I test the system pressure by using a T fitting after the filter and with no obstructions other than the FPR.. I only get 41 PSI.
So, I know that the pump will build to 56 PSI if completely stopped up and I know that 0 PSI is coming out on the return line. The question is, where is the rest of the pressure bleeding off if I'm only getting 41 PSI of system pressure? I can hear the FPR hissing so I'm sure there is probably a tiny stream of fuel shooting through it... but I don't know if it's enough to drop 13 PSI. I'm afraid the excess pressure may be forcing fuel through the injectors (Hence why the car won't start) but I would expect it to take more than 41 PSI to cause that.