The 2006 did not have one.
check valve
If your Chevy trailblazer 2004 gauges are not working, check your fuel pump.
The secondary air pump is located on the passenger side of the engine near the top sticking out of the side.
Fuel pump check valve is on the pump in the tank. vacuum check valve is in the line going through the firewall.
The flow back check valve is in the pump.
since check valve holds water in the line can a hand pump be installed between the check valve and water tank?
An air pump check valve comes in a variety of sizes. This type of valve can be purchased for about 12 dollars to about 40 dollars depending on the size required.
A foot valve, in relation to a water well, is a check valve at he bottom of a well to keep the water from running back into the well from the pump when the pump is not running. If the check valve does not hold the water the pump will lose it's prime and will not pump water.
Secondary air injection malfunction. Maybe the air pump failure or a leak?
There are many reasons why a check engine light could come on and shut a Trailblazer off. It could be the fuel pump or the oil pump. A mechanic will be able to run diagnostic tests to figure out the problem.
the secondary air injection system is the smog pump and valve. the valve is located on the exhaust manifold with 2 hoses leading to the smog pump which is located under the drivers side floor. it is electric.
Bad accelerator Pump? Bad float? Wrong, fuel pump check valve. new fuel pump is on order, or add a check valve.