The Stovebolt Site Forums The Shop Area General Truck Talk Vacuum Line from Fuel Pump to Windshield Wiper Motor

On the '41 -- '46 was the vacuum line from the fuel pump to the windshield wiper motor simply a hose or a combination of hose and steel tubing? It would seem to me that tube from the pump and through the firewall would be tubing and then transition to hose. Does anyone know the answer?

Don

Does it matter? I think the double pump was a dealer-installed option, anyway.

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Does it matter? I think the double pump was a dealer-installed option, anyway.

Not as far as drawing a vacuum it doesn't, and yes, this double acting pump was a "new" add-on for my truck, as it was just installed last week.

My question wasn't intended to start debate, it was simply posted in hopes of getting ideas and the chance of seeing a photo or two. Since the pump is mounted low on the engine and in an area subject to oil leaks (the pan) I was just wondering if perhaps it was tubed way back then.

Don

The best I remember it was hard plumbed with steel line most of the way.

Don, I've been looking for the same instructions since I'm thinking bout adding one to my '50, 3604 down the road, tain't found any yet either. What I may end up doing is running a steel line parallel to the fuel/vacuum advance lines and bring it up to the carb. From there I was going to tee into the manifold vacuum line. I was under the impression that this was a vacuum assist and not a sole source for the wiper vacuum. When the throttle is closed and the engine is idling (max engine vacuum) I would think that the pump would be at minimum vacuum, with the throttle open, at high power or rpm the manifold vacuum is lowest and the pump vacuum would be highest.
Now I'm still mulling it over in my mind how this is going to affect the manifold vacuum and carburetion when the throttle opens. I could swear that I had seen instructions for the pumps installed this way somewhere but can’t find it now.
I would expect that if you spend upwards of a hundred bucks for a double action pump that you would get some sort of instructions with it.
Denny Graham
Sandwich, IL

Denny, that is the type of input I was looking for; Ponderings, musings, and ideas. If anyone has already done it or recalls how it was done "back in the days" it would also be helpful info. I'm certainly never bashful about asking.

BTW, I just sent you an email about another topic.

Thanks,

Don

Somebody posted an image of original instructions here a few years back.
I remember, cos at the time I installed a vaccum assist fuel pump.
The drawing showed rubber hoses, which should be the stiffer fuel hoses, so they don't collapse or swell in case of oil leak in the pump.

The Input of the pump connects to the wiper - the Output to the manifold.

Just don't use a PCV system when using a vacuum wiper.
The drop in vacuum from the PCV slows the wipers, sometimes to a stop.

I must have pulled a vacuum on my brain, as I normally do a thorough search of the Forums prior to asking a question. Since there are plenty of threads available on this topic, I will delete this thread tomorrow so as not to clutter the site.


Denny -- this thread has some good information pertaining to the vacuum line routing and also provides a link to some great photos.

Thanks,

Don

Don't delete Don, you never know when there might be a little bit of information in any thread. Text does not take any space at all to speak of, so ya taint cloggin things up.
Denny G

down2sea- I sent pics of my setup to you, Dave

Dave, thanks for the pics

Don

OK, see Don, don't delete! I never would have gotten to that thread if I'd had to use that %*& *^$% search engine, it never finds what I'm asking for and I waste days trying to find something.
Yep, Factory Assenbly Manual, sec 0, sheet 18.00 pretty much explaines it I found that bout 04:00 this morning before I went online. That's been drivin me nuts all night, I knew I'd seen it before. It didn't seem right that the two lines would be tee'd together.
Good thread, learned a lot and archived it in the folder for next summer when I hope to be reassembling the old gal. I planned on adding a dual action pump then.
Denny Graham
Sandwich, IL

I'm glad you had a Factory Assembly Manual Denny. I thought that there would be a copy on Keith Hardy's TOCMP site but didn't find it. If you or anyone else are able to scan the pages please post them.

Thanks,

Don

I haven't used a double pump but traditionaly it goes from the vacumn to the the intake manifold steel plumb then from the intake to motor rubber hosed. I own a 41 chevy pickup and this is the way mine was.

Well lets try to get a scan of that page up before we get side tracked again. That is not the way the later ones were plumbed and that doesn't sound right. The function of the second pump section hasn't changed much from it's inception, and it is a pretty basic system. I'll see if I can scan that into my webshot's album tomorrow.
Denny Graham
Sandwich, IL

Think this should explain the routing for the AD’s
http://rides.webshots.com/photo/2101005090098611668XaMaVu
Denny Graham
Sandwich, IL