quote Originally posted by pmbrunelle: Do you still plan on using the fuel heater once you're supercharged?

Only if the heater thing works. If it does this ought to reduce pinging by keeping the fuel pressurized in the Intake.

quote Originally posted by White 84 SE: Sounds great but how would the fuel be diverted at the T from traveling up the wrong side of the injector? And with the injector rejected fuel where is the pressure to propell it through the T valve. This introduction of fuel to the Fuel pump pressurized mass will lower pressure for a second or so. Or would it?

Look at the pick I posted above. Now imagine the filter/heater is AFTER the T. The fuel feed line comes into the T then into the filter then into the throttle body. The 2nd line off the T goes to a fuel pressure regulator then back to the tank as your cold fuel return line. The old and now unused fuel return port on the throttle body is blocked off.

Now think about how it works. Cold fuel is pumped out of the tank to the T where it has 2 places to go, up to the filter/heater and on to the TB or back through the pressure regulator and is returned to the tank unheated. All fuel entering the filter/heater can only go to the throttle body. The old unused throttle body fuel return port is blocked off so all heated fuel must exit through the fuel injector. The pressure regulator will open/close as needed to maintain the required pressure and will see only cold fuel.

quote Originally posted by Hudini: Look at the pick I posted above. Now imagine the filter/heater is AFTER the T. The fuel feed line comes into the T then into the filter then into the throttle body. The 2nd line off the T goes to a fuel pressure regulator then back to the tank as your cold fuel return line. The old and now unused fuel return port on the throttle body is blocked off. Now think about how it works. Cold fuel is pumped out of the tank to the T where it has 2 places to go, up to the filter/heater and on to the TB or back through the pressure regulator and is returned to the tank unheated. All fuel entering the filter/heater can only go to the throttle body. The old unused throttle body fuel return port is blocked off so all heated fuel must exit through the fuel injector. The pressure regulator will open/close as needed to maintain the required pressure and will see only cold fuel.

Thanks for working with me on this. I think I am seeing what you mean. So it looks like I wouldnt actually need the regulator in the Holley at all. Perhaps it can be removed and utilzed pre-filter/thermocouple. Will have to study the structure a bit to see if possible. So the tubing is a direct connect to the injector and function can be the same before or after injector if injector area completely sealed in place of regulator.

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84 Duke, Holley TBI, Manual Trans 4.10, CompuCam, White

Well now. It seems like if a T before the thermocouple might divert the extra fuel without a regulator if the TBI out were plugged. What do you think on that?

By the way, I realized why my first attempt hook up didnt work. I need a check valve so that coolant can only flow one way. I am thinking PVC valve...metal.


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84 Duke, Holley TBI, Manual Trans 4.10, CompuCam, White

[This message has been edited by White 84 SE (edited 09-26-2009).]

The FPR must go on the return line otherwise fuel will be fast flowing back to the tank and of very low pressure up to the TBI. You will need a stand alone FPR for this. The Duke's FPR is an integral part of the TBI and needs to stay in place. Just cap off the return port where the fitting for the fuel line screws in. It's metric threads.

On my turbo coolant line I simply cut the heater core feed line and plumbed the turbo so that all coolant to the heater core passes through the turbo first.

EDIT: The stock fuel system is a loop. pump-->filter-->TBI injector-->fuel pressure regulator-->return line. My (stolen from Darth) suggestion is pump-->"T" --filter-->injector--|blocked off| The other outlet goes "T" --> fpr--->return line

[This message has been edited by Hudini (edited 09-26-2009).]

2nd attempt works!!!
Coolant runs through and gets pretty hot. Doesnt seem to actually warm the fuel in the filter much though. I will try to heat wrap the junction to see if that improves heating rate. It takes the gas from chilly to nearly lukewarm which is something atleast. Improvements to come.

It flows pretty fast through the filter. Hard to heat it up much. That is why I suggested the above method to slow it down at the filter. It's allot of work just for an experiment though...