Improved sub tank transfer rate.

[Cuppa]

Another little win hard on the heels of my improved fuel consumption.

As long as I’ve had the car the transfer from sub tank to main tank has been quite slow, but I just accepted that this is how it was designed to be. Also whenever I have removed the sub tank filler cap it has always hissed a little, sucking in air.

Yesterday I finally investigated. I tried blowing compressed air through the breather tube into the tank & wasn’t too surprised when it became obvious there was a blockage. Having discovered this I started pulling secions of pipe off one by one, expecting to find a mud wasp nest or similar. The blockage turned out to be right at the end of the pipe right against the spigot on the top of the tank. Unable to push it out I had to cut off the end of the pipe. Finally exposing the cause, it turned out to be one of those little plastic protectors which come on the end of ockie strap hooks! it had a tiny hole in it, which is probably why the tank hadn’t collapsed from a vacuum. How on earth it got there is anyone’s guess! I know when I first looked at the car the sub tank had a leak, & the tank was replaced by the car yard before I bought it.

Now when transferring fuel from sub tank to main tank, the fuel gauge rises probably twice as quickly.