Project Cool Blue’s ’65 Coronet hides an 825-horsepower Ray Barton Hemi under a deliberately unremarkable exterior, but the trickiest part of staying invisible isn’t the engine, it’s feeding it fuel without giving anything away. The team turned to a fuel system originally built to solve the same problem in modern Corvettes, adapted to fit inside a decades-old stock gas tank. No visible fuel cell, no whining pump, no giveaway hanging underneath. Here’s how a shallow foam baffle keeps an 800-horsepower secret completely silent.
The intention for Project Cool Blue—our ’65 Coronet—is to be a stock-looking sleeper. Unbeknownst to others, under its stock flat hood will be a Ray Barton-built 528 Street Hemi with a dyno-proven 825 hp. From behind, that stealthy/stock look will continue on, sporting the stock gas tank, leaf-spring suspension, and stock-looking down-swept tailpipes from TTI Exhaust. We didn’t want an unsightly tank sump with hoses hanging underneath out back, nor did we want a fuel cell in the trunk when we were fueling up at a gas station, and we certainly didn’t need a super-loud high-pitched whine announcing the movement of hundreds of gallons of fuel.
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A car that hides an 825-horsepower engine under a stock-looking hood is impressive enough on its own, but the real engineering trick on this ’65 Coronet build happens somewhere you’d never think to look: inside the gas tank. Sleeper builds like Project Cool Blue live or die on details most spectators never notice, and fuel delivery is exactly the kind of problem that can blow a sleeper’s cover in an instant. A whining high-pressure pump, a visible fuel cell in the trunk, or an unsightly sump hanging under the rear end are the giveaways that separate a true sleeper from a car that only looks stock in photographs. The team behind this build had a specific part in mind to solve all three problems at once, borrowed from a category of fuel system originally designed for something else entirely.
The Same Trick Late-Model Corvettes Use
The fuel system in question uses a foam and rubber baffle to build a sump directly inside the car’s existing tank, rather than requiring a custom fuel cell. It’s cut to fit almost any tank, including factory units as shallow as six inches deep, and it’s designed to keep a constant fuel supply flowing to the pump even under hard cornering. That’s essentially the same approach used in modern Corvettes, just adapted here to slot invisibly into a decades-old Coronet gas tank.
Built for Way More Power Than This Coronet Needs, For Now
The system comes in two pump sizes: a 340-liter-per-hour version rated for up to 800 horsepower on EFI, and a smaller 200-liter-per-hour version good for up to 550 hp. Builders chasing even bigger numbers can step up to a dual-pump configuration. It works with either a carbureted or fuel-injected setup, meaning Project Cool Blue could switch fueling strategies down the road with nothing more than a regulator swap.
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