Burn alot of fuel ,check engine light flashing

Sometimes you cannot hear the fuel pump run for priming start up. How do you know its not running? The engine wont start, what are your symptoms? The green light has to do with fuel economy while driving. Check your owners manual for its function to be sure.

The check engine light flashing is a pretty much universal sign that you have a misfire that is bad enough that a lot of raw, unburned fuel is being dumped in to the Catalytic Converter, to the point that it could be ruined if the problem is not taken care of very quickly.

leaks.! why not fix that, first thing???????
no engine option stated.
but if the engine is MAF based, it will go lean (air/fuel mix) with ANY un-metered air leaks. (illegal)

that flash CEL means you will burn the CAT up ,if you keep driving
the operator guide tells you that, read it.

when all cars glow the CEL the mech, uses a scan tool
to scan PCM to see all the errors
im sure you have P0300 (misfire DTC errors) USA cars.
but there may be others, why not scan it and look????????????

running lean and flogging the engine can burn valves too.

1: check fuses
2: scan it,
3: report.
or its 2 days hard work , doing it the hard way.

I would start with a tune-up: new plugs and wires, new distributor cap/rotor button, new air filter, maybe a new fuel filter. If you get gas at the same location all the time, try a different one for a while too.
These would be the easiest to do first to eliminate some common issues.

The check engine light is telling the driver the computer has a problem with something that can affect performance or emissions.
The problem is serious when the light is flashing.
You would need to have the computer scanned for trouble codes to proceed.

Loud fuel pumps are fairly common in gm products (isuzu) as far as the check engine light, flashing means you are not supposed to drive it solid mean you have a problem get it scanned at a local parts store and post the code here i can help

First....you will have to check the code(s) stored in the computer.
The check engine light is telling you....you have a problem and fixing that problem may help with your fuel mileage.
When the check engine light is on....you loose 20% gas mileage and have 20% higher emissions.

Sounds like the Catalytic converter needs to be looked at or replaced.

light come on or flashing

Check fuel filter & any restriction in fuel lines