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Message: [QUOTE="Wayne, post: 428755, member: 863"] corrected^ I haven't bothered studying the stock system, but I know the Elite air dog upgrade kit returns the heated fuel to the tank. While technically the heated fuel (and previously cooled fuel in a system retaining the cooler) is directly connected to the supply system, it actually has to go in the opposite direction of flow past the regulator to be recycled instead of going to the tank. The problem some guys are having is that the air dog regulated pressure is lower than the regulator pressure on the air dog upgrade, not allowing the upgrade regulator to open, which leaves the hot fuel in a dead head system without a cooler in some cases, causing temps to skyrocket. I'll be checking fuel temps on a truck without a fuel cooler, but with an AD-II, and airdog upgrade having properly set pressures so we can see where fuel temps end up. This will happen some time within this coming week if all goes well. Obviously it will still get hot if there's less than 1/4 tank, but this test will be with 1/2 tank plus. I expect that with the AD assist regulator opening, fuel temps will be manageable. If not, we'll consider some plumbing where either a fuel cooler goes back on, or return fuel is not regulated or both. **EDIT** perhaps I won't be testing without a fuel cooler^^ [/QUOTE]

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