INSTALLING INLINE ELECTRIC FUEL PUMP

I didn't bother reading the OP. All caps is just too much work.

However, it should be noted that all the electric fuel pumps I am familiar with shut off as soon as the fuel pressure reaches what it is supposed to be. Turn the key, they stutter for a couple seconds and quit. As the engine starts and fuel starts to flow, the click on and off as needed to maintain proper fuel pressure. I've never heard of an electric fuel pump that runs continuously.

It is common and a safety feature for a fuel pump to cut off if there is no oil pressure.

You need a good diagnosis for your model to see what you have.

Do you know how to turn off the CAPS?

Posting in ALL CAPITAL LETTERS is internet yelling.

As was suggested in your other posts, most folks won't bother with reading one in all caps.

So if you are looking for help...turn off the caps.

You might want to post what chassis you have so anybody with good knowledge of that particular chassis / model / year can offer some help.

With a Chevy P30 chassis, when you first turn on the key the engine computer causes power to be applies to the fuel pump relay for two seconds to supply fuel under pressure to the fuel rail.

Then when you continue to turn the key to start the engine, power is applied to the fuel pump relay once again as the engine is cranking over.

When the engine starts and oil pressure comes up, the fuel pump relay drops out and a pair of contacts in the oil pressure sender close to provide power to the fuel pump. Those contacts then become power to the fuel pump so long as the engine is running and producing oil pressure. The relay is no longer providing power.

Apparently you are tied into the fuel pump system somewhere that is not providing power once the engine is running.

Is your problem that the engine starts and then quits once you let off the key???