Fast Question Here About Cooler

[MJTru]

Where in the fuel system is the best place to place a fuel cooler. On the feed/pressure side, or the return side back to the cell. Low pressure. Im working it out right now and if I was to guess I would say the return.

Edited March 11, 2015 by MJTru

[GTR_JOEY]

Return mate

[MJTru]

Thanks im running two 044. Was reading up a bit on if they would heat up the fuel a whole lot. What ive came up with is my regular needs to be changed. I need one that return the fuel right from the regulator and not the rail to the regulator. That would be away to keep fuel temps down. As well as putting a tee on the surge tank return and the fuel regulator return and sending those line through the cooler before it goes back to the cell. Damn im pull what little hair I have out my head counting fittings and all. Thanks again mate:wacko:

Edited March 11, 2015 by MJTru

[GTR_JOEY]

Just keep it simple man..

Flow should be from your lift pump which feeds your surge tank. Those two 044s feed the rail .. Fuel is returned from your rail through the reg.. After the reg It will the run through your cooler returning to your surge tank

I don't understand what you mean with the T's, you want all your fuel to be cooled on the return

Draw a diagram to figure out your fittings,

Does that help?

[MagicMikeZ32]

My cooler is on the return to tank.

[GTR_JOEY]

Same

Under the car with ducting

[MJTru]

Just keep it simple man..

Flow should be from your lift pump which feeds your surge tank. Those two 044s feed the rail .. Fuel is returned from your rail through the reg.. After the reg It will the run through your cooler returning to your surge tank

I don't understand what you mean with the T's, you want all your fuel to be cooled on the return

Draw a diagram to figure out your fittings,

Does that help?

Ok im doing the diagram now. Lol.

It's still hell. Fitting wise. But I dont agree with the fuel returniong off the rail. I should just feed that with pressurized fuel. If it returns off the rail to the regulator. Thats added engine heat being pass within the fuel that the engine is making. But they have FPR that has the pressure goes to it and from the regulator it goes (pressurized here to the rail) in the regulator the regulations of pressure happens and it then returns to the cell. I hope you understand that part. Now for the Tee part. Lol bear wit me here please.

So as the fuel is being returned to the cell it will go through the cooler at that point I want to take the over flowing fuel that the lift pump is pumping to the surge tank = over flowing fuel as well and tee that into the cooler with the fuel coming from the FPR. That way all overflowing fuel is cooled. Ha there. Can you see it now.

Edited March 11, 2015 by MJTru

[KiwiRS4T]

Not sure you've got it right but maybe you're just saying it wrong. You need to do like GTR Joey says. The fuel in the rail is pressurized by being blocked from leaving by the regulator. To paraphrase:

Tank>lift pump>surge tank>044s>filter>rail>regulator>cooler>tank.

[scotty nm35]

Saw a great OEM fuel cooler today on an old Merc, the return line went through a nice little coil wrapped around the aircon line. Would obviously only work when the aircon was on, but that would be most hot days I guess.

[GTRPSI]

Oi Scotty, im surprised you didnt mention variable speed fuel pumps or pump controllers to reduce the need for a cooler....go on now, i always enjoy your posts on fuel setups

[MJTru]

Lol. I had already gotten these 044 pumps so I cant go the fuel lab stuff. Live and learn. Next time. Ok I did say it all wrong. Here goes again.

Ok there are some FPR out there that has the fuel pump pressure go straight to them. (Pressure to FPR) insted of the fuel rail. Now these types of FPR are away like most are from the engine and are commonly located on the fire wall. Internally speaking now there are up to 4 feed lines going to the rail and when referring to this setup there is no return from the rail. The only return in from the FPR. the only difference in the two setups are one always flowing fuel from the rail to the FPR. The other just pressures the rail and returns from the regulator.

I feel a regulator of that kind can reduce heat a whole lot. Due to the fact that the engines heat isn't being added to tye fuel on the way back. I think this time around I did the expansion a bit better.

[GTSBoy]

I feel a regulator of that kind can reduce heat a whole lot. Due to the fact that the engines heat isn't being added to tye fuel on the way back. I think this time around I did the expansion a bit better.

Well, sort of. Most dead regs are actually located at the tank/pump end of the circuit, rather than up at the engine bay.

And in real terms, it's not the circulation of the fuel through the rail that really heats it up. It's the fuel getting thrashed to stupidly high pressure over and over again by really big pumps as it goes around and around that does most of the damage.

[MJTru]

Hmmm. So what your saying is I should just keep my FPR and just add the cooler at the end before it gets to the tank.

[scotty nm35]

Yes, on the low pressure side in the return line.

[scotty nm35]

Lol. I had already gotten these 044 pumps so I cant go the fuel lab stuff. Live and learn. Next time. Ok I did say it all wrong. Here goes again.

Ok there are some FPR out there that has the fuel pump pressure go straight to them. (Pressure to FPR) insted of the fuel rail. Now these types of FPR are away like most are from the engine and are commonly located on the fire wall. Internally speaking now there are up to 4 feed lines going to the rail and when referring to this setup there is no return from the rail. The only return in from the FPR. the only difference in the two setups are one always flowing fuel from the rail to the FPR. The other just pressures the rail and returns from the regulator.

I feel a regulator of that kind can reduce heat a whole lot. Due to the fact that the engines heat isn't being added to tye fuel on the way back. I think this time around I did the expansion a bit better.

If you meant non return fuel systems, the reg is in the tank and the pressure bleeds off. Unfortunately you can't add boost pressure to these regs though and your fuel pressure would drop in relation to the manifold under boost. Not a good thing if like me you run more boost than base fuel pressure.

With a large enough pump you can easily run no reg at all, just using a 2mm or so restriction in the return line. I know this works because I initially tuned the Evo like that before I realised they had a restrictor in the return (intank), and the 460L was flowing twice what the stock pump could. Not something I would recommend though.

[MJTru]

Thats intesting. I never thought it would drop the fuel pressure. If that was the case. Here comes a lean situation. I might as well stick with the one I have and run the cooler.

What do you think of the idea of running the surge tank return and the rail return through the cooler.

Or would it be best to just run the rail return through the cooler only.

[scotty nm35]

You probably only need the return from the rail to the surge tank to be cooled.

[MJTru]

Hmm. My diagram returned the rail to the cell not the surge tank.

[GTSBoy]

That's fine.

The hottest fuel will definitely be the fuel coming back from the rail. It has been through both the pump and the rail. You will get the best heat removal by trying to cool the hottest fuel. Therefore return from rail, regardless of where it goes (main or surge tanks) is the best idea.

[MJTru]

I couldn't find a really good fuel cooler so I used a trans oil cooler with 8 an lines in and out. I will make a system under the car to funnel air through it on an angle.