Pilot light goes out when furnace starts

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I have a 1993 Mobile home that has a propane Coleman Evcon heater in it. The pilot lite was out. I lite it and it stayed lit. Then when the Thermostat is turned on, something happens that the Pilot lite goes out, the heater Never starts to run, you just hear a click (during this click I guess the pilot lite goes out). I am guessing that this is not something simple, but I would like an idea to know what this is, so we will know how much this is going to cost with a service call or not. The Model # 79566856 the serial number is 068510.

Thanks Ryan from California

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The first thing I would check is the pilot orifice and the burner orifice. Spiders and other little creatures cause them to plug up. Please include your complete model number on the next post so I can try to look it up and see what else I can find out for you. Look at the furnace repair link below to see where the pilot and burner is located.

http://www.mobilehomerepair.com/articlefurnace.htm

hvac1000

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7900 C Series Furnace (Standing Pilot)

Model NO. 7956C856
Serial NO. 920674070
BTU/HR/INPUT 56,000
BTU/HR/OUTPUT 46,000

7956F396 Rev 1 P.I. (5-92)
7945-320/B (3/92)P.I.

Robertshaw-Grayson
720ERC5
7A3-C4F025
7956-336

UL United Lab
NO. AJ203630
7656A316
(10-90)P.I.

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It could be as follows.
Bad gas valve.
Restriction in the pilot orifice/not enough pilot flame .
Not enough gas pressure in the line=low gas pressure.
Dirty wire connections to the gas valve OR
low voltage to the gas valve not allowing it to open all the way causing a flame out situation.
In order to test these items you will need tools and meters and the knowledge to use them.
You could probably try to clean the pilot orifice your self and I provided a link in my first post for the repair section.
If you do not know what you are doing call a qualified repair person to service the furnace for you.

hvac1000

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Thanks for pointing me in the right direction. I have a freind comming over Saturday, that knows about this. You guys are always so helpful. Glad I have bought some of Mark's products this year. Ryan