Yesterday I installed a new Perry Pump on an engine. While running it on the bench and adjusting the carb, it suddenly went way lean. I shut it down quick and discovered the red tubing that powers the pump had broke off at the nipple on engine. I recut the tubing, reinstalled and before I could restart the engine, the tube split again. I replaced the red stiff tube with fuel tubing and proceeded with the adjustment. The pump works fine but the instructions caution against using soft tubing. I could only find black vacuum tubing locally as a replacement. Will this work. Any suggestions would be appreciated. Thanks