i am going to back half my car and put in a fuel cell, i have a walbro intank pump now and it seems to work fine i am also using an aeromotive regulator im not sure which fuel pumps i can use, can i use a high pressure pump as long as its regulated so that it will keep up with my add ons and upgrades later? my current setup is a forged 393 stoker with a gm 847 cam and 1.6 rockers 58 mm tb and a bunch more micalanious , also what is a good size fuel line to use and should i replace it all the way to the rail

here are the 2 i am looking at

 

Is the engine carbed or fuel injected? That will determine the fuel pressure you need. While both those pumps are high pressure pumps, the fact that the pumps are rated at "free flow" does not tell you what they will flow at their rated pressure.

Neither of those pumps would appear to flow as much as the Walbro at the 45psi required for an injected motor.

 

it is fuel injected , my problem is i dont know that much about fuel pumps. so are oyu saying none of these will work for an lt1, what specs do i need to look for and if you dont mind teaching me something tell me what specs and why thanks

 

A fuel pump flows a lot of fuel at very low pressures (~free flow), and the flow drops off as pressure in the fuel system increases. You need to know the pump's flow capacity at the pressure your fuel system operates at. Then you have to have a good idea of your engine's fuel requirement, so you can make sure the pump can flow enough to satisfy the engine's peak power demand, while still having a 20% (or so) excess for the recirculation/return flow from the rails. If you can estimate your engine's flywheel HP, I can estimate the fuel requirement (assuming its running normally aspirated, no power adder). That would give you an idea of how much flow you need. You would also have to know the pressure you are going to operate your fuel system at.... typically, you would be looking anywhere from the typical 43.5psi stock pressure, on up to 75psi.

Bosch makes a really good 205LPH pump that can be mounted either internal or external, and will easilly support 500 flywheel HP, while operating at 58psi. The advantage of that particular pump is that its flow stays relatively high at higher fuel pressures. I run a pair of those.