boostedHULK

iTrader: (1)

So, like the title says, i'm putting a new fuel pump on the car, it was set up with a stock one when i pulled the engine from a different car and swapped in into mine. it's 13b with weber 48ida. i ordered the 7psi summit pump instead of 14, hoping i could get by without a regular. it's 7psi and 95gph at full bore. I was hoping to get some feedback on this? I'm not going to run a separate relay, just going to fuse the stock wiring, i think with fuel juice this thing would supply too much fuel. should i change anything else in the fuel system? i was looking at getting rid of the cutvalve back by the fuel pump too, any reason not to do this? trying to clean up my plumbing a bit. thanks for your time,

Neil

t_g_farrell

iTrader: (1)

I think you will need to spring for a regulator. You will likely see 5 - 6 psi at the carb
and that will probably blow by the needle seat. I know it will on a Dell but webers
can take a little higher pressure, so try and see I guess.

PercentSevenC

Yeah, you're probably going to want to regulate that down a bit. Even if it doesn't overwhelm the needle, your float level will be really high, which could screw with your progression.

I'd recommend just picking up one of the cheap Holley FPRs.

boostedHULK

iTrader: (1)

has anyone used a voltage regulator to reduce fuel? just curious. i was just looking, and thirty bucks for the reg., no reason not to, i'll probably just pick that up, but i thought it was an interesting idea. Is that a regulator on the carb on the back side of it their, or just a filter?

j9fd3s

iTrader: (3)

put it on and test it! i've got a 6psi carter on mine, but thru the stock fuel lines and 2 filters it only manages 4psi, which is totally fine for the weber.

its also good to test the volume, thru all the lines and filters the carter doesn't flow anywhere near what its rated at

boostedHULK

iTrader: (1)

i was kind of counting on the poor wiring and a couple filters to keep it from being at 7 psi, i mean that's rated max. I was thinking anywhere 5.5psi and under i would be good. i have a gauge, so i'll know if i need a regulator or not real quick. anyone got good links to some mount pics? it's supposed to be inverted, i should have done a bit more research so i could have reused the stock location. i had planned on removing the cutoff valve setup back by the pump, is that going to cause any unexpected problems. i want to simplify the setup as much as possible, just emissions lines and then to fuel filter-fuel pump-carb. no reg., no return.

boostedHULK

iTrader: (1)

does mounting it any other way besides vertical effect the cooling of the pump or what? i really just want to try and put it somewhere similar to stock.

t_g_farrell

iTrader: (1)

The carter 4070 clearly states in the installation to mount it vertically. I assume
the pump will suck air otherwise and burn up.

You can get rid of the check valve dodad with no problems. Just make sure the
vent line still works.

boostedHULK

iTrader: (1)

So, i still haven't mounted this pump, making a bracket has been a pain in the butt with minimal tools. What about mounting it on the firewall and just keep it below the bottom of the tank?

t_g_farrell

iTrader: (1)

I don't think the fire wall goes that low and its also supposed to be as close to the
tank as possible I think.

82FanTC

iTrader: (9)

mounting on the inside frame rail works great. can get a nice verticle position and it is enough out of the way that it doesn't interfere with anything. Just drill some holes and use sheet metal skrews with some rubber washers between the pump and frame to reduce vibration noise

twinkletoes

iTrader: (17)

I had the 4070 or 4040 (I forget exactly) carter pump mounted at / angle. Worked fine for 2 years when it said to be mounted vertically lol

cfamilyfix

iTrader: (15)

+ 1...my holley pump is mounted upside down in my engine bay fire wall and it is a nightmare. Carb floods every time I shut off the engine. I would say put it back by the fuel tank and mount it low. This seems to work the best for others and hopefully soon for me too!

t_g_farrell

iTrader: (1)

Heres what my setup looks like mounted:

bumpstart

the vertical mount thing is to stop fails that can burn down your car
supposedly to stop seals drying out and the bowl leaking

keeping it low keeps the suction head down and limits the noise

here is one installed into the factory bracket on a 626 ( not all that different to FB rx7 )
note it is lower than the shield which is not great for very low cars


i recommend the OP google bypass reg and dead head reg setups to get some idea about the limitations of both setups
weber will tolerate 3.5 - 4.5 psi and no more

dead head regs though easy to set up with existing fuel line sizes
are prone to creep ( amongst other issues )
and the best method is to add a small return with a tiny bleed out the unused side of the reg
or teed from the fuel delivery hose at the carb

if redesigning the fuel system then 3/8 bundy tube delivery and return lines off a bypass regulator fuel setup is the optimum method to actually get the 95 GPH from the pump

boostedHULK

iTrader: (1)

got it, thanks for all responses. i just mounted it to the frame rail, it worked out well, i just went and bought some self-tapping screws and called it a day. thanks for all responses.