I have been driving a '47 1/2 panel for about ten years on and off. The wipers have worked o.k. in the past. I put a 3:73 rearend in from an '86 suburban so I could go fast(80mph). The wipers don't really press on the glass enough to work at high speeds in a downpour. I put on a newer wiper arm with the spring to hold it against the glass. Now the vacuum motor isn't strong enough to move the wipers back. I pulled out the vac motor and put some oil in it, that helped for awhile, but not enough. I have just installed a dual action fuel pump with vacuum generator. Ran the pipes, I like bending that tubing, it came out nice. Now when I start the engine, the gas flows out of the top and side of the carb like a fountain. I don't know if my old fuel pump was weak, and the new pump has found the carbs weak spots, or what? But I can't get it running long enough to test the wipers. I did a search here, and discovered, even with the vac gen, the vacuum wipers are not strong enough to move a wiper with a spring arm. And I need that spring arm wiper to hold the blade against the glass when I'm going 80mph in a downpour. So, it's time for electric wipers. When I opened the vacuum wiper motor and saw how it works, I was amazed. That is my favorite part of the truck. An engineering feat. Mechanically perfect. I guess I can put it on the wall and look at it. Was there a question... Oh yeah, does the dual action fuel pump have more pressure than, on second thought, I'll have a look inside that carb.
