Fuel System: 140 Carb: Filter in fuel tank for 145 B20A

I have just found out that there is a filter in my 1973 145. The volvo workshop manual does not mention this but Haynes states that it needs to be removed and cleaned every 12.000 miles. It is situated on the bottom of the fuel tank, I found mine after removing 34 years of undersill. I tryed to remove the brass filter, after making a tool, but did not want to give it too much force until I find out if I am doing the right thing. Should I drain the tank or does the unit have a valve to keep the fuel in the tank. Please let me know of your experiences.

martyn

[classicswede]

I cant remember any filter on the fuel tank tbh. If there is a filter I would have thought it would be on the pick up pipe. Anyone know better???

[Peter Milnes]

Martyn, if you look on page2:62 of your 140 service manual, section 2, Engine, fig 2-153 shows the small filter that surrounds the suction end of the fuel pipe inside the fuel tank, fig 2-154 shows the pressure filter which is in the fuel line to the fuel rail (mounted on the pump mounting bracket). The one in the tank is made of nylon and does not need to be replaced, unless it becomes blocked. The pressure line filter is a paper type and does need replacing at 12,500 mile intervals, being external to the pump this should be reachable without disturbing the fuel tank innards.

The B20A, being a carburrettor engine, does not have the latter filter and the in-tank filter is still not normally replaceable unless it gets blocked. There is a strainer inside the fuel pump (mechanical) and there is usually an in-line filter in the fuel line between pump and carburrettor.

All the best, Peter.

[Audrey Old]

Last year I had to replace the tank on my carb 164, it stemming from a fuel blockage. I overhauled the carbs, put a new mechanical petrol pump on and even replaced the petrol delivery pipe, to no avail. I removed the tank and used my foot-pump to blow back down into tank from outlet spigot - result, almost totally blocked.
I didn't chip off any underseal to see if a filter retaining panel was under the gunk, but replaced the tank with an identical one from a 1970 Volvo 144 which I broke up years ago. Result - it runs fine now!
In the Haynes manual for the 164, page 34 fig 3.9 it shows item 14 as being an in-tank fuel filter for a carb-engined car, so conclude that you, like me, have had the displeasure of that filter being blocked. However, how you get it out is beyond me and as I had a spare tank didn't investigate - lazy or what!

Paul

Thank's to you all. So far I have not had any serious problems with the fuel line but have been trying to correct a problem in running with a missfire on acceleration, which I hope, I have found the problem on the electrical side and not the fuel, although I will clean and tune the carb. I just thought I would make sure that the filter did not need servicing untill needed.

Thank's again for your help.

Martyn