This is a 7.5L (460) in a 1986 e350 Econoline Cutaway RV. Just before we had it towed, there was a loud pop and hiss from that capped vacuum port. For the
How to Install a 60278 Mechanical Fuel Pump on a 1986 Ford F250 - YouTube
Good Sam Club Open Roads Forum: Class A Motorhomes: fuel pump removal