Thread: FI Surge Tank
03-09-2012, 08:00 PM #1
FI Surge Tank
I wanted a fuel system to support an upgraded engine program on my street toy, but wanted to keep full OEM functionality.
Run the OEM fuel system, complete with trip computer and emissions equipment, into a surge tank where bigger pump(s) can be fed.
The above fits into a custom compartment I had fabricated under my trunk, where all of the fuel system components can be housed without stinking up my trunk/interior.
So what are all the bungs for?
The -8 AN Bungs on the bottom are to feed up to 2 fuel pumps
The top 2 -6 AN bungs are for the supply, and over flow of fuel between the OEM fuel tank.
The middle 2 -6 AN bungs are for the return lines for up to 2 Fuel Pressure Regulators
The 1/8" NPT bung on the bottom is to monitor the pressure of the surge tank in case there are any transfer problems.
I admit both the custom compartment, and the 16 liter surge tank are overkill for the average street car. But, this is my way to combat fuel starvation from the OEM fuel system, meet the demands of highly modified engines, and keep the OEM fuel gauge and trip computer functional.Rep Points > Posts since 2010
03-09-2012, 09:19 PM #2
Very Sweet Setup.
EURO 04 M3 Current Mods:GC DAs, Eibach Sways, PF RTAB's, RE RCAs, INTRAVEE II, Black Roundels, ///MFEST Badges, Depo's, Screen protector for NAV display, VCSL Bumper + Race Lip & CF Trunk & CF Rear Diffusor, DIETZ TV in Motion, SS= V1 Headers + catless pipes + X-Pipe + SS Sport Exhaust, Z8 Starter Button, Lamin-X, OEM CSL interior, OEM CSL Steering, OEM CSL Intake, OEM CSL Roof, MSS54HP + OEM CSL Tune, BBS CH's, LIGHTWERKZ, 355mm ST40 BBK, BW Oil Cooler....
03-09-2012, 10:33 PM #3
03-10-2012, 07:16 PM #4
03-20-2012, 04:47 AM #5Stage 2 or 2.5 E9X M3 S65 V8 supercharger kit for sale: http://www.boostaddict.com/showthrea...r-kit-for-sale
03-20-2012, 09:56 AM #6
The solution that some have used is to install a second fuel pump that pulls fuel from the opposite side of the fuel tank, and pumps it into the baffle that the OEM fuel pump sits in. This helps quite a bit, but you lose your fuel level sensor in the process. (No fuel gauge, or trip computer functionality) The other issue is that you are still limited to the flow potential of the OEM fuel pump.
Personally, I like the idea of having an extra volume of fuel on board with a surge tank, because on track (road course) you can suck down a TON of fuel really fast. I know of high HP BMWs running out of fuel in the middle of a session because of this...Rep Points > Posts since 2010
03-21-2012, 03:20 AM #7Stage 2 or 2.5 E9X M3 S65 V8 supercharger kit for sale: http://www.boostaddict.com/showthrea...r-kit-for-sale