Using standard ra28 fuel line as tank return from 1G rail.

[thomasbl]

These are the fittings on the fuel rail. The rear one, with the metal line does indeed look like a banjo fitting, which is held in by the reg tightening on it. The return one however, seems to be a barb integrated into the reg. Or am i missing something?

Rear.

Front

[o_man_ra23]

Righto Justen... so why isnt the fuel on direct injected motors heated?? They inject fuel straight into the flamefront, no time there for vapourisation, and its a far better system. The pressure that injectors spray at is meant to vapourise to a decent standard.

Oh, and Thomas is using an under-bonnet surge tank, which will suffer heatsoak, not just the usual heat you get from a fuel system.

Cheers, Owen

[JustenGT8]

errr because they inject at like 1500+psi and that does the job for em

The fuel could be boiling mate and i reckon it would make squat difference.

Just think about it, you are adding cc's of fuel to a hundred + of cubic meters of air, it can't contribute bugger all temp increase to the intake charge and that's not taking into consideration my earlier points.

[RAd28]

owen - your gonna have to heat the fuel VERY significantly to be of any concern, the fuel that feeds my 1G starts out by passing over the exhaust twice at the rear of the car, once on the way TO the surge tank, once again from the EFI pump, then once it gets to the front of the car passes close to the dump, then with in an inch or two of the rear turbo, and across the back to the injector side.

read an article in zoom where they tested the fuel temp rise in super mega HP cars, which were running a quartet of High pressure pumps.. ambient temp was something like 23deg, and final temp after running for half an hr at the engine was something like 30deg...
like justen said.. keep in mind your in take charge is probably around 40-50 on a good day

i had the nice man from 'hoses and fittings r us' come and braze up a whole bunch of fittings for the fuel to and from the rail, used the standard banjos and fitted a brass tail where i needed it. the guy was a champ, cost me about $100 for 6 fittings custom made... on my door step.

guys at pirtek said they don't deal in that kinda thing... i'd be better off going queensland diesel spares who said try harvey's hoses... who had nothing...

[TA-022]

dont say fuel fittings .... just ask for X sized barb to X sized compression fitting.

like i said ive no merit for fuel temp or return to tank i just went with what the crowd has done before me

[Norbie]

I agree with Justen, fuel temperature is such a small factor it's not worthy of consideration on a street car. There's no doubt you will see power gains with cooler fuel but I doubt you'd see a measurable difference, and the risk of increased detonation just isn't there. On turbo cars especially the inlet charge is likely to be warmer than the fuel anyway.

Having said that I'm not a big fan of surge tanks in the engine bay, but that's for safety reasons. I'd rather have a reservoir of volatile fuel behind me in a crash, not in front.

[o_man_ra23]

Volkswagons have a nice big surge tank up front

Cheers, Owen

[Norbie]

Yes, and they are the safest car known to man!

[RAd28]

but it's not in the engine bay.. ergo, not near a heat source...

[o_man_ra23]

no, but whats the first part thats going to have a problem if you have a head on??... its right next to your feet too

Oh, and about VWs being safe... is that before or after the magnesium blocks spontaneously combust??

Cheers, Owen

[RAd28]

no, but whats the first part thats going to have a problem if you have a head on

OOOooOOOOoOO... i know this one!!!!


YOUR BUMPER!!


and magnesium is safe in atmosphere so long as it's not a fine powder...
one would only imagine they would make a magnesium block from a magnesium alloy which would be safe when exposed to air... especially if it's an air cooled engine...

[thomasbl]

I know this is getting dangerously close to the original question but... I used a 8mm to 6mm in line barb reducer. Problem solved. I dont think the difference in fuel temp will make much difference to performance, if any, however, it was a fairly straightforward solution so i went with it anyway.

Thanks to all those who threw up ideas etc..

[o_man_ra23]

Gerrard... tell me why so many of them spontaneously combust when other air cooled engines dont then?? Its probably from some magnesium oxide powder due to corrosion

Cheers, Owen

[RAd28]

can you post a link, or other source of info detailing the spontaneously combusting vw? i just had a good look and can't find ANY record of a VW (or any magnesium alloy) spontaneously combusting...

[SIKTOY]

OWEN AND GERRARD
Shut up were talking about 1G's
get back on topic

Thomas
As rod and 99% of other people said return your fuel to the surge tank not the fuel tank

I ran my 1g on standard 23fuel lines with no problems and I didn't even have a surge tank just a fitting in the bottom of the tank and never went under 1/4 tank and all was fine dodgey yes but worked well

In the new set up Im running an intank pump


Ben