Krawler
Guest
If your return line was rubber they can deteriorate from age, heat, additives in fuel. If you are running bio diesel it is harder on rubber components because of the methanol in it. The same with higher strengths of ethanol, now you see vehicles that can use E-85 because the components are built to take it. The pulsation can over time work on a hose causing it to fail. The constant expansion and contraction movement. Hydraulic line will work fine if you can get your hose clamps to squeeze tight enough. Sometimes on higher PSI hoses the steel braid in the hose will prevent a good seal and you will have a leak. The pulsation in the hose is likely just the pressure spikes from the lift pump. As the pump strokes a rush of fuel goes through the system. Does the pulsation speed up as you speed up the engineIJ