After driving few miles, the car's fuel pressure decreases

[pwuser154605926461]

AOA guys, i have baleno 2005 jxr.
I used to run it on both petrol and cng, but since 2 months i have been driving it on cng. (due to petrol problem).
Last week, I refueled my car tank with 500rs petrol and drove it for 1.5 to 2 kilometers. After that the car stopped getting fuel and started to stall. Then i converted it into cng, drove for 1km, and converted it back to petrol. After converting it back to petrol, it gave the same issue. (gone 1km - 1.5km, then stopped flowing petrol to engine).
What could be the possible issue?
Tho car works fine with petrol during 1km - 2km..

[babaralinawab]

either the fuel pump is dying
Or can also be the chocked fuel injectors
Also check injectors
Lastly check for fuel pump relay it may also be faulty stopping current supply to the fuel pump

[FaatehRehman]

Close the CNG cylinder valve and then try.

[nvdmns81]

Probably fuel filter choked or failed pump. It runs on fuel which is in the lines for a km or two and then it can't meet the engine demands and engine stalls. So check fuel filter for clogging and then pump for proper output.