its pretty cold were we are at and someone siffend gas out the van now we hadto put more gas in it and it will not start at all could the fuel pump had gone out or does it need to be thawed out

As long as all that happened is that fuel was siphoned out of the tank - even to the point of completely draining the tank, the only thing necessary to do is to put more fuel in the tank, the fuel pump is self priming & will prime the system in just a few seconds. If u suspect a possible frozen fuel line, dump one or two bottles of Iso-Therm or Iso-Heat fuel line antifreeze ( the key is that it must have Isopropel Alcohol as the active ingredient ) into the tank ( no more than 2 bottles ) & allow the antifreeze several hours to do their work.

whenever l need to check the status of a fuel pump (like if I've run the tank empty, or suspect the pump is no longer functioning), l do the following:

1) turn the key on & off atleast 10 times, not trying to start it, but to
prime the fuel lines & listen for the electric ''hum'' from the pump.

2) short of complete engine failure (seized bearings or pistons), if
the engine does not start, its probably related to a lack of fuel, no
spark, or no air (clogged air filter or obstruction in air intake). Since
the van was running prior to someone robbing ur fuel, u can
throw out the idea of engine failure & look at the other 3.

3) start with the easy stuff first. If you're going to do the work yourself,
get a repair manual. Then, remove the air filter & hold it up to a
a bright light source, such as a shop light or the sun. if u can
see light, you're okay. if not, replace it. they're usually less than
$20. Next, locate the fuse panel & look for blown fuses or relays
for the fuel system, ignition system, or anything else while ur in
there.

4) locate the fuel injection rail underneath the hood. this is a metal
(aluminum) line that runs along the top of the engine, & into the
fuel injectors of each cyclinder. assuming that u have a V6, the
front 3 cylinders will be horizontal to the front of van. u should
see whats called a Schrader valve on this fuel line. Thats basically
a larger version of the air valve on ur vans tires, but entirely made
of metal. Remove the cap & depress the plunger, just like u
r removing air from u tires. The only difference is that u will be
squirting a little bit of fuel under high pressure. WEAR SAFETY
GOGGLES!!! It would not hurt to have a few rags lying around, too. If
there r no problems with the fuel pump, & no restrictions in the
fuel line, u should have pressure & fuel at the fuel rail/Schrader
valve. If not, then u need to crawl under the van & check the
fuel filter for obstruction (very common). On ur van, it should be
located along the passenger-side frame rail, somewhere around the
rear tire. Carefully, remove the rubber fuel lines from both ends of
the filter. There might be some pressure built up on the tank-side of
the filter, so remove it carefully & remember the rags & safety
goggles. Once the the filter is off, let it drain off excess fuel (if any),
& clean the ends off with a rag. Try to blow air through the filter.
If u can not, or its very difficult, replace it. Again, this filter should
be less than $20. Before installing the new filter, u need to test
ur fuel pump. The easiest way is to add a few extra feet of
rubber hose (temporary) to the the fuel line coming out of the tank.
Place the other end into a suitable container, & turn the key
several times. If you've got fuel squirting out, the pump is fine.
Install the new filter with the correct length of line, & you're back
in business. If u do not get any fuel to squirt out, chances r
u will need to replace the pump. l had to do it twice in 4 months on
our Dodge Caravan, & its not fun or cheap (about $350). In order to
replace the pump, u will need to drain the tank, as that is where the
pump is located. l highly recommend u let professionals do this,
unless u r fairly gifted with mechanics. Not everyone is, &
that is okay. l hire technicians to fix my computer because there
r just some things l can not do, & l can admit that.

5) if you've read this far & r comfortable removing the fuel tank, its
just a matter of swapping parts. Considering that water weighs
about 7lbs per gallon, fuel will weigh about the same. If you're
dealing with a full tank, u will need to find a suitable place to drain
& store 20 gallons of fuel safely, & u will also need the stregth
of SuperMan to do. A vehicle lift is invaluable in these situations,
as well as a few good friends & some pizza/beer.

6) if you've got fuel, & have a clean air filter/intake, the only other
item to check is spark. No spark could have a bunch of causes,
& not knowing what engine u have makes it hard to tell u
route to follow. If you've narrowed it down to spark, haul it to a shop.
You do not know if its a distributor (if ur engine uses one), a coil or
coil pack, the computer.....or??? Take it to the shop.

Hope this helps u out!

if it ran fine before the gas was taken out . add new gas into it and it should run just fine!