Return Fuel Line Plumbing

[dzorde]

I had a similar problem with my surge tank, this is only a small tank (about
5L), and the fuel returned into this while being constantly recirculated
into the main tank from the low pressure feed pump.  However, on hot days
when spending time stuck in traffic, the fuel in the surge tank would heat
up so much that you could actually hear it start to make that boiling
bubbling sound, and every time I'd fill up the car there would be lots of
water droplets on the inside of the petrol cap and filler neck  (not a nice
thing to have), had to use lots of water dispersant in the fuel to get rid
of the water in the tank.  Ended up fixing the problem by adding the biggest
Dayco oil cooler I could get into the engine fuel return line as a fuel
cooler.  The fuel is now nice and cool by the time it is returned to the
surge tank.

Dan     dzorde at geocities.com

>   One thing I'd like to mention about fi return fuel lines- I had a 
>wierd problem where my air- cooled VW bus would 'skip' in power on really 
>hot days when I had less than a 1/4 tank full. Turned out there was a 
>leak in my cooling tins, blowing hot air on the metal fuel rail. 
>Presumably the fuel got warm, and not having a lot of cool gas in the 
>tank to dillute it, warm enough to create vaperous bubbles that leaned 
>out the mixture, made the engine run hotter...etc. 
>    Most of you obviously won't see that bad a problem, but fuel must be 
>alowed to cool(dumped back into the main tank)- or never be alowed to get 
>heated(insulated fuel lines). Just something to keep in mind if anyone is 
>thinking about an auxillary tank.
>
>Mario T.
>mailto:Freshmar at aol.com-----'76 VW Camper FI A/T,,'79 Fiat X1/9
>
>
>
>----------geoboundary--
>