I had been trying to work out why my fuel supply to the twin IDF 40 Carbs was so poor. This was especially odd as I had replaced the normal fuel line with 1/4" copper gas type pipe. This in theory should have given a substantial difference in the fuel delivery, however there still did not seem to be a full filter of fuel and whatever I set the fuel regulator to there was no difference in supply.
My first thoughts were that the fuel pump might be failing. This was soon dispelled as removing the pump and checking the pump diaphragms gave no indication of holes or pump problems . I assembled the pump and turned my attention to the consideration of the matter further.
With the pump functioning OK and the fuel line having just been replaced the only other solution had to be something to do with the tank. The tank had a air feed built into the design so I new that it could not be causing a vacuum in the tank which would cause fuel starvation.
The only other possibility was the fuel gas tap on the bottom of the tank. I had repaired the tap before putting it back in the car and had re-used a piece of gas pipe 1/4" and soldered a washer onto the outside so that it would lock against the nut. I had also placed the old filter onto the tap. I removed the tap from the tank and found the cause of the problem the old filter was so full of rubbish that it was partially blocked. I would have to purchase a new one.
I found a new one on eBay at the amazing price of £2.50 and bought it on a buy it now price. The item fitted the tank perfectly and this seem ed to clear up the problem of the fuel feed. The filter obviously was so blocked that it was restricting circulation.
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