Fuel tank fabrication project

[David Hodgson]

I was also concerned about cooling, but when I looked up the 044 I see it is an in-line pump.
I really like the way it mounts externally on the tank. Great idea Mike.

[Aussie Mike]

Originally Posted by David Hodgson

I was also concerned about cooling, but when I looked up the 044 I see it is an in-line pump.
I really like the way it mounts externally on the tank. Great idea Mike.

Heat was one of the things I was thinking about with the mount. Inline pumps rely on the flow of fuel through them to keep the motor cool (running them dry is bad for them). That heat however is transferred to the fuel and in theory the temp of the fuel leaving the pump will be higher than when entering. An in tank pump transfers it's heat directly to the fuel in the tank so the temp over all will slowly increase but in general the temp of the fuel in the line should be lower. Having the inline pump connected directly to the tank should mean the tank will act as a heat sink and keep the pump running cooler.

The other thing I was thinking is I'm going to change the way my fuel lines run. Currently fuel runs up to the fuel rails on the injectors, through them back to the regulator and then back to the tank. The engine heat going into the fuel rails will be transferred to the fuel and be taken back to the tank and progressively heat it up. The plan is to have a fuel distribution block on the firewall where the fuel comes in on the main line and then is connected to the reg and goes straight back to the tank. From the distribution block there will be a line going to each fuel rail. That way the heat will not be taken back to the tank.

I'm probably over thinking it all but what else am I going to think about, The GFC or Global warming?

Cheers

[David Hodgson]

Now I might be over thinking it but..... how much volume do the fuel rails hold and will this fuel, not being re-circulated, absorb too much heat and cause vapourising issues. Being under pressure might help in raising the boiling point whilst driving or high fuel usage situation, but if you've driven somewhere and parked in summer, when starting again there will be no fresh circulating fuel through the rails.
I suffered this on a carbied car, but then they run a lot lower pressure in the fuel line.