Will the alarm system stop the fuel pump from working, when a new fuel pump is installed

Maybe this will help ---

Also check the fuel shut off switch since you do not have power.

Check the following:
- Fuel pump pressure.
- Polarity.
- Fuel filter.
If the problem persists keep the starter motor engaged for 8 Seconds.
- Switch the ignition OFF.
- Pull up the error codes with diagnostic computer.

You are right that it could be either component, or something else electrical. The security system will kill the fuel system if the wrong key is used or the system is acting up.
A mechanic would check base fuel pressure with a gauge and also see if the pump is getting power from the relay when it fails to start.

no 2 alarms are the same.

follow the path, of the pump. using a volt meter. (pink wire)
some cars, only run pump for 3 seconds key on, and cranking.
so take 2 people.

How did you test the fuel pump?
Which one Distribution Pump or Transfer Pump?
Do you have fuel presuure at the rail?
Do you have a crank signal or spark?

V8--V6!

If you remove the fuel pump fuse of relay you will stop the flow of fuel. A simple on/off switch installed on the hot wire going to the fuel pump will work.

One of several issues will present this problem.
Bad fuel pump = check for fuel pressure and power to pump replace as nessassary
Plugged fuel filter = change fuel filter
Alarm system activated = disable or deactivate alarm
There are other possibilities but you need to start with these

check for a good spark first, if there is none look at ignition circuits its more likley this part,
it could also be the car alarm the immobiliser shutting of the ignition ""stops it getting nicked?"
try resetting the alarm if you take off pipe to carb and there is fule pumping out!!! fule filter is "ok" for starting up on!!! take care working with fule!

Find where your fuel pump relay is and check for power there. Most alarm tech's and alarm system dis engages the fuel pump at there relay's.

Simple things to check is the fuse first then go for the relay and if everything there is working properly, it could be your alarm may have gone bad or your fuel pump it self.

Good luck and hope this helps

PURPOSE OF ALARM SYSTEM IS SO THAT WILL WARN IF BEING STOLEN ALSO CAUSES IGNITION SYSTEM TO BE DISABLED BY SHUTTING OFF FUEL PUMP POWER SUPPLY WILL HAVE TO FIX ALARM SO VEHICLE WILL START