West Coast

First one, if I changed to 315 tires from the stock 265's his there a special calculator that will tell me my mileage? I am assuming that the old mileage divided by gallons will be off a little because of the larger tires.

What size are the hard fuel lines for the return line by the overflow valve and supply line into the injector pump?

Thanks.....

Dave

displacedtexan

Here is a calcualtor to answer your first question. And I can't help with the second. But I'm sure someone else will soon.
http://www.dakota-truck.net/TIRECALC/tirecalc.html