a inline fuel pump or replacing the one in the tank? is there a big difference in price which would build up more pressure?

 

Why are you looking to increase your fuel pressure?

Most applications only require an in-tank Walbro 255.

 

For pressures above 50-60psi, you need a high pressure in tank pump, or an inline booster pump. But you need to satisfy both the pressure and the volume requirements of your system. What sort of HP are you trying to support? Why do you need high pressure?

 

well i have a 383 stroker in it now and Im gonna try a 250 shot of nitrous i have been running a 150 shot and i was told if you go higher you will need a new fuel pump so i was wondering which was less costly and which was better...

 

You don't need high pressure capability, unless you are using one of the dry systems that boosts fuel pressure when you spray. If that's the system you are using for the 150-shot, you would already have an inline booster. If you are running wet, you don't need pressure, you need volume. The stock pump isn't going to support a well built 383 plus a 250-shot.

What size injectors are you running? What kind of flywheel HP?

Have you considered a stand-alone fuel system for the nitrous? That way you can run a small tank of high octane fuel to help resist detonation when you spray.

 

im getting 385 to the wheels which is average i guess but i still have stock heads but the nos is a wet system and am guessing i will stay with a wet setup just change the jet so i guess before i do i need to change the fuel pump

 

You have to know the flywheel HP, not the rwHP. Its flywheel HP that determines the fuel requirements including injector and pump requirements. We could back into the flywheel HP if we know what kind of trans you have. Why not include that in your signature? "stroked out" really doesn't tell people what they need to know to help you.