For a few weeks, nearly month I noticed that my fuel consumption started to rise up. Petrol fume also can be obviously smelt somewhere around the carburetter. Until one day I notice that there was a leakage at one of the 'square shape mini pump' of the Solex Carburetor. Upon referring to Haynes Manual, it was called as Fuel Pump, refer to the exploded diagram, the whole unit assembly is labelled from no. 72, 73, 74, 75, 76. Obviously, upon rev up, petrol clearly seen to seep out through this mini petrol pump.
I did survey few workshop for this 'critical mission'. I was shocked when told that I have to skim the carburetor base. They claimed that the carburetor might have warped, thats why leakages happened. Lastly I when to see the late mechanic's assistant. He suggested it might be only seals or gaskets or maybe diaphragms. I love simple ideas, so I went to him.
The square pump secured by 4 flat screw. Upon unscrew of all this 4 screw, the assembly will then exposed the assembly. We found out that the diaphragm had worn out. Test with engine oil; pour it into the diaphragm and see if leaks occurs. The diaphragm is labelled as 73, but it comes in one package, both 73 and 74. Bought it from Yonit, local VOLVO and SCANIA parts dealer for RM145 for both diaphragm and the spring. Change it and refit the whole assembly back, very simple work. No special expertise needed for this job I guess.
The accelerator get powerful back now, no petrol leaks, no losses. Tested on highway, owh, to get below 130km/h even with light footed acceleration is not that easy. :)
*FYI Solex Carburetor have 3 diaphragms in total.
