struhall

i have been having fuel starvation problems when my car under 1/4 tank under hard acceleration and hard cornering, and i have been thinking about doing a fc in tank fuel pump setup.

everyone i have read about doing in tank pumps is for fuel injected cars, or people doing swaps so they are keeping their high pressure pumps. alot of reading i have done said that doing a regular high pressure in tank pump with a regulator to get it down to 7 psi would kill the pump in a hurry.

and i was wondering if there is a way to have a in tank pump that is a low pressure setup.

Siraniko

iTrader: (13)

Its easier to just install a surge tank.

struhall

what is a surge tank, and how does it work?

trochoid

iTrader: (6)

If you want to go that route, upsize the return line and use a Mallory 4309 return style fpr. I'm bulding a tank for a Canadian member who will be running that setup. He will be running new 3/8" lines for supply and return.

Siraniko

iTrader: (13)

Fuel line goes to fuel pump
Then it goes to a canister or surge tank
Then to another fuel pump.

Rx-7Doctor

iTrader: (13)

I would first have to ask what carb are you running? Also what fuel pump are you currently running. Also is this on a stock,streetport, 1/2 bP,full BP?

struhall

right now i have a holley fuel pump, and i holley 600. its a small streetported gslse 13b. but i want to switch to a sidedraft like a mikuni or similar. a setup kinda like the one here.

https://www.rx7club.com/1st-generation-specific-1979-1985-18/another-blowthrough-beast-rotaryshack-627897/

Rx-7Doctor

iTrader: (13)

You won't have the problem with the side drafts like you have with that gas guzzling Holley.

What do you have your fuel pressure set at? Also make sure you do not have any type of kinks in your feed hose from the pump.

steve84GS TII

If you decide you want to run an intank,you could use a GM TBI fuel pump on the FC holder,and regulate it down to the proper 5-6lbs of pressure.
Rochester TBI only needs 12-13psi to work,so its not like youll be strangling the pump down 30-40 psi.Baffled,intank pumps have many benefits in addition to solving slosh issues.They are quiet,completely protected from the elements,auto-priming and they run cooler.

elwood

iTrader: (1)

Realize that most in-tank pumps have the same basic construction as their external bretheren. Many firms use external pumps (Aeromotive, Essex, etc) with a bracket and pickup to make high flow internal kits. There's nothing magical about internal pumps -- plus there's the downside of being more difficult to service, if necessary. For production cars, in-tank makes a lot of sense because of 1) Packaging 2) Fewer parts the plant has to assemble to the car 3) Quieter.

As for the anti-slosh aspect, the best fuel cell arrangements use a surge tank internal to the fuel cell with trap doors. This same setup is used whether the pump is internal or external. There are mini surge tank or reservoir setups that often come attached to internal pumps, but once again -- this same setup is easily adaptable to the fuel pickup for an external pump.

For my money, I like external -- easier to access, plus my favorite pump -- the Bosch Motorsport 044 -- comes as an external on the Porsche 911 Turbo.