70 thermstat controled replaced igniter,filters,spray nosle ,hoses last year. worked fine until last week. would only run about 3 min. had to start it 3 or 4 times. then just stoped . found crack in fuel line replaced. now plug in nosal sprays fires up stops fires up again then shuts off. every time i plug it in. why dose it fire 2 times then shut off. TOM

Check flame sensor , check hoses to pressure switch not split etc

Sounds more like the "crank position sensor" a small crack can cause your starting problems...NO, none of this means replace the motor:( YES do replace plugs, wires, clean air filter, spray out throttle body with injector cleaner, use specific "mass air flow sensor" spray cleaner only and clean that too...located near the air filter... A dose of the right TLC should add many miles of fun to your Blazer...Hope this helps.

I would check the ignition system when it dies, does it have spark? If not the CDI unit may be faulty or the pickup on the crankshaft end.

Wendy,
I have the same model Bissell as you and this is going to sound silly....
The spray tank runs out of solution allot faster than you would expect it to. Remove the tank, dump out all the used stuff, and refill your solution tank.
You never know that it is empty until you dump out the waste tank! 20 minutes sounds about right for a full solution tank to run dry.
Good Luck! Thanks for using FixYa!

the mass air flow sensor will cause this. you can remove it and spray it with electrical cleaner or maf sensor spray. you can buy at any auto parts store. follow directions on can for maf sensor spray. this sensor is very sensitive to dirt and debris. and also make sure air filter is clean and hose from filter is free from dirt.

Hi,
Here is a tip that will help you with basic trouble shooting..

http://www.fixya.com/support/r3877515-dehumidifier_problems_dehumidifier

heatman101

1. Check the ignition transformer. It may be grounded,
or it could be defective, and need to be replaced.
2. You have already replace the igniter and the
photoeye.
3. Once the ignition transformer works, everything will
be alright.
May this tip help you.

So many things.. I would first start with the fuel filter. Check to see if there is a good ignition spark at the plugs once it dies. If not replace the power transister next to the distributor. It also could be in the distributor itself. If the spark is good check the fuel pressure. If no good, you need to replace the pump. After that you probably need to do or have diagnostics run and see what that shows. You could spend a lot of money swapping parts.

replace fuel filter and (clean or replace) air filter. then pressure test fuel system.

Check the fuel pump and fuel filer, probably fuel pump needs replacement