Chris, Just by way of a little more explanation so you are clear as to what is required for a reliable EFI fuel supply you run the 1/4" line from the fuel tank via your LP pump to your surge tank. From the surge tank outlet you run the 5/16" line to the HP pump and then onto to the filter & then onto the fuel rail. The original 1/4" NA fuel line can then be used as the return from the fuel rail to the surge tank or fuel tank (your choice and lots of debate about which is best), whichever you decide is best the surge tank must have a fuel tank return as well and I think all 1600 tanks have provision for a return line even though most of them didn't have one fitted from the engine bay. My '70 has the return line & my '72 didn't but it did have a rubber bung over the inlet as I think this is pretty common. Make sure that you rubber fuel lines are designated for EFI use, and new stuff can be a bit exy but wrecked R31's have heaps of it in the engine bay and it's good quality stuff if you want a good cheaper solution. The R31 EFI HP filter setup is also a very easy to fit to a 1600 as it uses flexible hose fittings and a bracket that bolts onto a strut tower - we've used it on many turbo conversions and never had a problem with fuel supply.
regards Terry -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Andrew Greenbury Sent: Thursday, 29 January 2004 9:48 AM To: [EMAIL PROTECTED] Subject: Re: upgrading fuel system Gday Chris, The tank supply fitting is 1/4in, and return is 5/16in. If you look in an empty tank the supply fitting picks up from the bottom of the tank, while the return fitting is at a much higher level, so despite its smaller dia I used the original supply fitting into 5/16 pipe for my efi supply. Andrew --membersozdat------------------------------------------------------- OZDAT Mailing List Please Note:- Send (un)subscribe requests to [EMAIL PROTECTED] Send submissions to [EMAIL PROTECTED] No unauthorised redistribution of this email http://www.ozdat.com/ozdatonline/index.htm http://www.ozdat.com/ozdatonline/listindex.html http://www.mail-archive.com/[EMAIL PROTECTED]/ ---------------------------------------------------------------------
