I am experiencing a pressure drop. It drops from fuel idle pressure down to 0 pressure in about 6-7 seconds.

Stock Injectors, 12-907 Holley Pump, Vortech SFMU.

I am assuming this is the indications of a check valve problem and not a leaky injector of pressure regulator?

A slow drop should take 5 mins for a leaking injector. Right?

Also if it is a check valve problem, or an absence in one, can I add one to the fuel line? Also, if it is an injector, how can tell which one.

I had 440CC in at one time and replace them back to the stock as I saw my turbo project was taking longer. I never put those injector clips in, I saw no use for them. could this be the problem?

Also, My fuel pump does not come on with the ignition in the on position. I do not see hyundai clearly stating at any time that the fuel pump is applied voltage in the on position.

As I see it, if it came on in the "on" position you would not have a need for a fuel pump check plug.

If it did come on with the ignition in the "on" position one could simply check to fuel pump operation by doing so.

I am kinda at a loss.

Anyone have any suggestions or comments.

 

put the clips back on
your injectors might not be sealed right

those clips help hold them in place

make sure all those rubber thingies are sealed in right

 

I am experiencing very similar problems since i put in my aftermarket fuel pump. We looked at it, and it busted the stock fuel pressure regulater.

 

Actually, it cant be the clips for the injectors, otherwise fuel would be leaking out into the engine bay.

Leaking injector would mean its allowing the fuel pressure to spray onto the valves.

 

someone?

 

You know where the fuel lines mate to the rail aight? Check the hose clips. If those are OK then run the car at higher RPM for a minute or so, and feel around the fuel lines. Also check around the fuel filter for any extra fuel being forced out of a pressure leak. Next up would be the injector seals, see if the injectors are seated properly and check the health of the seals. If you got an aftermarket pump, check that the hoses are fresh ones, an old hose will become brittle and be more likely to produce a high-pressure only leak from a tiny crack, with the extra volume of fuel being pumped the pressure increase will be sufficient to give you the symptome you described.

Good luck bro, hope these helped a little!