Hi,

Have now changed my fuel system.

A SARD 280 l/hr tank in the stock tank is feeding a 1½ litre catchtank in the boot, then two bosch 984 pumps are feeding the engine. The return line from the engine goes to the top of the catchtank and I also have a return line from the catchtank to the stock tank.

I noticed that if I let the car idle for a while or drive slowly the temp of the catchtank and fuel gets pretty hot, I would think about 40-45 celsius.

How hot should the fuel get? Are my stock lines to small and causing the heat? Or is it normal?

 

I think the pumps are heating the fuel because they are working harder because of the lack of return flow. What kind of pressure is the car running at idle?

 

Fuel pressure doesn't seem to have gone up, will measure this today but the car is working fine, no signs of rich mixture.

Should be 3 bar fuel pressure minus the vacuum so about 2,5 bar fuel press at idle..


Anyone else than me with a fuel catchtank that uses this routing of fuel? I mean that the engine return line goes to the catchtank instead of the stock tank? I guess this is what is causing the heating, that some of the fuel gets pumped to the enging, then to the catchtank and then to the engine again... etc..