My Foodsaver Vac 800 and is a fewyears old (out of warranty). It vacuums, but the automatic sealing part is not working. The Manual seal functions. Is there anything that I can do to resolve this issue?

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This is likely happening because the unit cannot detect that a vacuum has formed, and because of this, the unit will not seal the bags, with the gaskets around the vacuum channel being the probable culprit. The Foodsaver gaskets will deform and/or dry out with time, just like in any device, but you don't necessarily have to replace them. I've tried this inexpensive solution on my own Foodsaver V2490, and it works perfectly.
Buy some food-grade silicone grease and apply it to both the upper and lower gaskets. I remove the gaskets and coat both sides with a thin layer of grease before replacing them in their respective channels. And since this grease will be absorbed and/or dry out with time, you will have to do this occasionally, so I also flip the gaskets (i.e. turn them over) whenever I apply the grease.
You can buy a 2 oz container of silicone grease at any dive store, or you can buy it over the Internet by searching for "Trident silicone grease".
This is a link where you can buy it for around $7.00:
Dolphin Dive Center
I do not work at this dive center, but I am a scuba diver and already had some grease that I use for the numerous rubber gaskets in my gear. The 2 oz. jar will last you several years, and you will find many other uses for it around the house since the grease will last longer than a spray.

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I had to take mine apart and clean the vacuum line out. It got tiny amounts of liquid in it over time and did the same thing. Before you take it apart, try setting the adjustment screw on the back. It's for altitude but, a slight turn could get you the results you need.

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Check the altitude adjustment. Also, check for food debris in the intake hole, tube or path. Check for debris on the rubber seal around the sealing strip.

SOURCE: Foodsaver V2490 will vacuum but will not

I experienced the very same problem. Pulled out the two foam seals, rinsed them under a cold water tap, wiped off with a tea towel, reinserted,

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Does the vacuum seem to run forever and it doesn't seal?
Clean the black foam seals

Replace them if needed. they can be purchased from Tilia
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