"You can pick lots of good reasons [yeah like wvo!] for increasing the fuel capacity of your diesel pickup. With an extra tank in the bed, you can shop around for the best price on fuel, and load up for a really long haul. (In fact, you can extend your range so much that you'll probably need to stop for human fuel several times before your truck needs replenishing.)"
I'm in the process of doing a 2nd tank conversion on a mercedes 240d. I've split the hot and cold hoses and ran them back to the second tank for heat. The initial hoses are getting hot in the engine but the hoses heading back to the second tank are not. No kinks in the hoses. Too little coolant? Pump? Any ideas?