Please fill out the following to ask a question. MAKE: Pace Arrow MODEL: P-30 Chevy Motorhome Chassis YEAR:1982 MILES:52,000 ENGINE:454CID DESCRIBE ISSUE.... Exhaust manifold for this old model has O2 sensors for each cylinder, one plug fell out, what a noise, threads are goo in the manifold, searched for these plugs, without luck, anybody know the thread size. Suppose I could measure it, didn't even know they were using 8 separate O2 sensors in any engine. Second problem is lack of fuel, 80 gallon tank in the rear, 30 gallon tank in the front. On a 700 mile trip a couple of weeks ago, front tank quit working, fuel filter was plugged, think I got bad gas, but replaced that and all is okay again, got home fine on the rear tank. This last weekend, front tank worked fine for a hundred miles, than quit, fuel filter still good drove fine on the rear tank again, but coming back rear tank was starving for fuel. Was fine for the first hundred miles, then engine died. Has a six port fuel valve Two tank inputs, return pipes for to each tank to prevent vapor lock, than two inputs to the fuel pump. Have a new Carter, gee on 17 bucks for these. What I had to do was to pull over, leave the ignition on, this valve feed an electric fuel pump and let that run for about five minutes. Engine started instantly, was good for another 10-15 miles or so, then died again. Bit frustrating, but did get us home. Both fuel filters are new and clean, quite the mystery. Suppose I can take everything out and check it, but did anyone ever have a problem like this before? Maybe I have water in both tank, this would be a pain to check.