Wat about the connection...I see there 4 hoses connecting the fuel rail...so should I disable 2 of the hoses?now I connect 2 hoses only.1 from fuel filter to fuel rail,the other to the regulator..correct?now reading on idling only 2bar still can't adjust.suspect the warlbro not working well....headache la...
I`m not understand what do you mean by 4 hoses but maybe you meaning of by-pass the damper regulator(should not be the main reason of unadjustable pressure/low pressure). Provide you the fuel flow diagram from start point to end point(to tank), replace the regulator (cyan square marked,fuel return side) you will need fitting and hose to replace OEM regulator.
What`s your fuel pressure for OEM regulator?Might 1 of these possibilities:
1. Faulty fuel pump /low voltage supply to fuel pump
2. Faulty fuel regulator (a lot imitation products in our market)
3. Leaking hose, fuel rails or injector seals.
You should discuss with your mechanic to troubleshoot with OEM regulator or fuel pump,get OEM pressure reading. You might get your answer for the problem.