Anyone can advice me about the frequent leakages of fuel feed pump in CNG mehran. I make sure that i use petrol regularly after every 30-40 minutes drive in CNG. I have changed two pumps in two months.
IS it because the pump is always feeding pressurized petrol till the petrol switch and the pressure is not relieved once the CNG is ON?
if yes then how to solve the problem?
Did you get your tank cleaned?
From my experience of Santro
Don't change fuel pump, nothing wrong with that. What make fuel pump failure in CNG/LPG is lesser usage and rust.
Finest rust passes upto injectors. You can check images in my thread https://www.pakwheels.com/forums/d-i...enating-santro. Lesser fine rust is held at fuel filter and pump sieve. If pump sieve chokes, it deprives pump motor of fuel, resulting in low pressure fuel.
I have been using same fuel pump for past 6-7 years, only sieve changed and tank cleaned frequently (once a year- after monsoon). Even serviced motor
For fuel leakage, I had same problem when I cleaned motor and refitted it, later found drop in pressure, on test bench I found that delivery pipe from motor (spring type) was loose being of pvc and leaking fuel back in insid pump, so I cut it from top and refitted with heating on stove and used clip to secure it, now pressure was normal.
Hope this helps.