turn gravity feed into pressure feed

Before I even start I know many of you will think I'm nuts and what I want to do is deplorable. Never-the-less, I'm still going to ask my question.
I'm thinking of buying a DeVilbiss Finishline 4 Waterborne gun and want to know if anyone has turned it into a pressure feed by simply removing the cup and running a paint hose over the shoulder to get a reasonable entry angle.
Now before you start growling, I don't plan to ever even try to be a pro painter and the reason I'm thinking of this scheme is that most of my projects will be small and I can use the gravity cup just fine. But occasionally I anticipate painting a small outbuilding or a utility trailer or maybe even a very old pickup and would rather not have to refill the paint cup frequently.
Also, every paint project I do will likely be for myself and I'm not terribly obsessed with quality.
To sum it up, I can only afford one gun of fair quality but would like to mostly use that one gun as gravity feed but occasionally as pressure feed.

How about another route? TCP Global has a cheap pressure pot AND gun with a 1.5 tip for $110. Buy your DeVilbiss for painting cars and use the pot with the big tip for thick paint.....or better yet, get an airless that sits on a 5 gallon bucket.

First, welcome to the club! Good to see you here..

Next, Yep.. You're nuts!:LOL::LOL::LOL:

I can't even picture what you're wanting to do! I can't figure out how you're going to use air pressure to push in paint plus use air to atomize that paint...

At least around here you can rent a pressure system for painting.

I'm certain with enough time effort and money you can accomplish this... but it's probably cheaper to visit harbor freight or northern hydraulics.. IMHO!:)

yeah Welcome to CHR. Now when I paint a car I mix all the paint at one time. Thinner and paint or reducer and paint what ever you don't mean to say you can't walk back to the bench and refill the cup...Just how many cups of paint do you use in painting a car??

Welcome to CHR! Glad you're here. Why would you want to wear out a good paint gun with building/trailer paint? You say you can only afford one gun of fair quality, but then you're going to run junk through it and have to buy another for your good stuff. I gotta agree with Robot, buy the gun to paint cars, parts, etc, and then buy a cheap airless for the junk painting. Consider the pickup to be "good". As for filling the cup, I think DeVilbiss has gone exclusively to their DeKups system, using disposable poly cups as opposed to the traditional stainless hard cups. The DeKups come in 9, 24 and 34 ounce sizes, so you can buy two or three sizes and use the gun effectively for small, medium or large jobs. A pressure feed system is going to waste a large amount of paint in the feed hose, and paint ain't cheap!!!

I can't forsee being able to shoot latex and enamel with the same gun, no matter what the modifications.

Check pawn shops, good deals abound on used tools, you can get the proper tools to do the job right.

Thank all of you for your replies. I suspect the advice to use the DeVilbiss for quality work then a cheap airless for buildings is good. I can't buy both for awhile, but have no special need to be in a hurry.