Fuel lines are something we install during a build, then promptly forget about. There is a difference between a mechanical fuel pump, driven by the
engine and an electric unit in the fuel tank. Both serve the purpose of delivering fuel to the engine. A mechanical unit driven by the engine pulls the fuel from the tank. While an in-tank unit pushes the fuel up to the engine. Because they work differently it is necessary to inspect them from another perspective. Most of us do a quick check of our vehicles before we venture out to a national event or a distant venue. Fluid levels, tire pressure, and any fuel line leaks. We’re usually looking for a wet spot on the fuel line to indicate a possible problem. With a pump in the tank9; this visual check should reveal any potential problems. But, with a mechanical pump, the only section of fuel line under pressure is the line from the pump to the carburetor. The rest of the line to the tank is under vacuum. A crack or small hole may not show a wet spot. So, a hole, even a tiny pinhole, in the line from the tank to the pump can pull in air causing the engine to sputter and die. If the rubber lines appear cracked or in bad shape, change them. It’s easier to change out the foot or so of hose at home than on the side of the highway. An important item to check with fuel lines is their proximity to heat sources and abrasion points. A good rule of thumb is to use metal piping where ever possible and minimize the usage of rubber hoses. Yes, you need them to deal with engine torque and other points of movement. But keep hoses to a minimum. Remember to securely attach any and all accessories associated with the fuel system. I personally stay away from the cheapo plastic inline fuel filters. I have seen them split from vibration and spray an engine with raw fuel……
Just a personal observation!!
Be vigilant, be safe! Happy Rodding!
Charlie Lungaro, GSRA