ok so I have a 2003 Hyundai that I am changing the hoses on. I have one question there are two lines that run from the block to the throttle body and they are $15 a piece. they look to be about 5/16" or 3/8" so I have some EFI Fuel line that is good to 50 PSI can i just use that cause the hoses look just like bulk hose. i am not worried about pressure just if the coolant mixture will react with the hose.