Ok, A few more questions in regards to the fuel system on my EFI. We have decided to use a low pressure pump at the rear of the car to feed a high pressure pump under the hood which will feed the fuel rail. We will be using the vapor line for a return line (we have drilled out the orfice already in the top of the tank). 1. Does this return line need to be able to handle high pressure? 2. What should i do about a vent in the tank now? 3. Should i have a fuel accumulator between the low pressure and high pressure pumps?
1 No as the other end is open which will relieve the pressure, Although i would check pressure with koeo, And after start up. just to make sure the line is large enough. If the line is to small you may not be able to regulate the pressure 2 I vented my cap, But be sure the vent is large enough as i have saw tanks collapse due to no venting, I on start up would probably leave the cap off, Then check after i had it running and tuned in. 3 It wouldn't be a bad idea as most low to high systems usually have a big filter between the pumps, This would act as a accumulator. Besides you need a filter anyway.
