Petrol tank/pipe question

[mark_biddle]

There seems a lot of questions kicking about petrol pipes at the moment, so I thought I would add to it !
I have a Dax tank for a De-Dion, and it has 2 outlets, or should I say 1 outlet, 1 inlet. The bigger pipe is open and O/D 13mm and the smaller one is 8mm and closed. I take it the small one you can open and use as a return for fuel injection. I am at a bit of a loss as to how the open pipe (13mm=1/2") then goes to solid pipe that is supposed to be 3/8" O/D ?
Do you need a 'step down' flexible pipe from the tank to the pump, or does the pump (not got that yet) have an input of 1/2" and output of 3/8".
Hope that all make sense, but I want to run the fuel line along the chassis so I can get the engine in, and get a bit more space in the garage !
Thanks.

[john w]

Hi Mark

I think dax do a fitting, I am making my own tank in stainless with a 3/8 pipe, & much cheaper.

John

[andy l]

Hi Mark

Dax supply reducer pipe 13mm to 3/8. most filters used are 3/8 in and out, Dax can supply in line filter but it is small. I got one from Lucas and bolted it between tank / fuel pump.
hope this helps Andy

[mark_biddle]

Thnaks Gents,
Seems strange they fit 13mm then supply a step down. Why don't they just weld a 3/8 pipe in from the start !
Another part to sell you I suppose.

[cliffords]

My flexible fuel pipe has arrived today and is marked as below.
Does not sound right to me for the SVA, do you know if it is ok?


Cordan Antistatic oil hose 20 Bar WP -9.5mm 46D19

Any good ?

[madjohnny]

Originally Posted by mark_biddle

Thnaks Gents,
Seems strange they fit 13mm then supply a step down. Why don't they just weld a 3/8 pipe in from the start !
Another part to sell you I suppose.

Good question................Maybe because then they wouldn't be able to sell you an adaptor!!

ps Demon Tweeks also do 1/2" to 3/8" reducers!

[Daxman]

Can you not just run 1/2" pipe the full length car?

[mark_biddle]

Yes could do, but would mean changing the inlet on the carb, not a big job I know. I was more interested as everybody here, and the Dax manual says running 3/8" pipe, so I thought I was missing something. I think my best option is to change the inlet on the fuel pump. 1/2" from tank to pump, then 3/8" from pump up to carb.

[madjohnny]

If you're putting a fuel filter in between the tank & pump make sure you can get one with 1/2" connectors as most of them are 3/8".