Am not an electronics specialist, though I'm doing a modification on an engine.using a hall effect sensor ,how and where can I tap it to connect for injector pulses using the diagram below ?

 

This Post seems to make no sense.

A more extensive explanation of what You are trying to accomplish,
and, information on the type, and purpose of the Engine is needed,
as well as a Schematic showing the connections to the Hall-Sensor.

Was the Engine originally equipped with a Carburetor or Fuel-Injection ?
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This Post seems to make no sense.

A more extensive explanation of what You are trying to accomplish,
and, information on the type, and purpose of the Engine is needed,
as well as a Schematic showing the connections to the Hall-Sensor.

Was the Engine originally equipped with a Carburetor or Fuel-Injection ?
.
.
.

This Post seems to make no sense.

A more extensive explanation of what You are trying to accomplish,
and, information on the type, and purpose of the Engine is needed,
as well as a Schematic showing the connections to the Hall-Sensor.

Was the Engine originally equipped with a Carburetor or Fuel-Injection ?
.
.
.

The end was originally equiped the a carburetor and a trying to modify it to a single throttle body injection,I want to use that circuit diagram but I don't know where I can connect the pin from a hall sensor output,or do I also need to cut out the volume controller.

 

Remove 555 and feed the 33k with pulses from hall.

 

Fuel-Injection using the provided Circuit will NOT work.

You will need something like a "Micro-Squirt" Fuel-Injection-Computer, ( around ~$300.oo in the USA ),
and since You will have to program it Yourself with a Laptop-Computer,
this will also not work,
because You do not yet understand exactly how, and why, an Engine works.

The Engine will not run using such a simple Circuit.
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Also, fuel injectors do not work at 12VDC, but rather at more than 100VDC. At least in most engines.

 

Also, fuel injectors do not work at 12VDC, but rather at more than 100VDC. At least in most engines.

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That's only for "Direct-Injection" Injectors that spray directly into the Combustion-Chamber,
and most use around ~60-peak-Volts, with PWM-"hold-open"-Current-Limiting.

Even Direct-Injection Injectors are still designed to "hold-open" with 12-Volts.

Diesel-Electronic-"Common-Rail"-Injectors are more "heavy-duty" and may require higher peak-Voltages.
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That's only for "Direct-Injection" Injectors that spray directly into the Combustion-Chamber,
and most use around ~60-peak-Volts, with PWM-"hold-open"-Current-Limiting.

Even Direct-Injection Injectors are still designed to "hold-open" with 12-Volts.

Diesel-Electronic-"Common-Rail"-Injectors are more "heavy-duty" and may require higher peak-Voltages.
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.
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Yeah, most of my experience with injectors has been with Diesel engines.