Any merit to this? - Page 2 - Fuel Economy, Hypermiling, EcoModding News and Forum

Frank Lee · 05-20-2014, 11:56 PM

Oxygenated fuel is good- that's why having ethanol blended in is good.

Frank Lee · 05-21-2014, 03:42 PM

Depends on what you're blending with.

As far as pressurizing gas tanks: Wouldn't that alter fuel line pressure and if raised enough, cause the engine to run rich, then causing the ECU to re-trim leaner?

RobertISaar · 05-21-2014, 03:57 PM

Quote:

Originally Posted by Frank Lee

As far as pressurizing gas tanks: Wouldn't that alter fuel line pressure and if raised enough, cause the engine to run rich, then causing the ECU to re-trim leaner?

yes.

enough pressure and you can double fuel flow per time unit, causing an indicated 100% gain in MPG on a trip computer.

reality, no change. well, actually, worse since the energy to pressurize the tank isn't free, but it will show nearly double.

Superfuelgero · 05-21-2014, 09:44 PM

Quote:

Originally Posted by RobertISaar

yes.

enough pressure and you can double fuel flow per time unit, causing an indicated 100% gain in MPG on a trip computer.

reality, no change. well, actually, worse since the energy to pressurize the tank isn't free, but it will show nearly double.

True, the trip computer is calibrated to the stock pressure (more pressure = more flow). Also trip computers only read fuel injected at the injector. Force fuel through the canister/evap system, and its like "free" gas that the trip never sees.

oil pan 4 · 06-08-2014, 12:38 AM

Fuel aeration, like what most carburetors have used for 40 years to help mix air and fuel?

gone-ot · 06-08-2014, 12:29 PM

Quote:

Originally Posted by oil pan 4

Fuel aeration, like what most carburetors have used for 40 years to help mix air and fuel?

...which was called "vapor lock" when air bubbles were entrained in gasoline (due to heat) in carburetors...but not a problem now with fuel-injection which uses high-pressure fuel.

Remember, there are TWO ways to make a liquid evaporate: (1) reduced pressure and/or (2) increased temperature (heat).

oil pan 4 · 06-08-2014, 02:02 PM

I have had vapor lock on my camaro it sucks..
In a carb like a Carter, eldbrock there are air inlet ports and air mixer tubes that look like tiny machine gun heat shields down in side the carb housing that premix air and fuel between where the fuel is metered by the jet and introduced to the intake stream at the venturi.
If one of these air ports gets plugged up the engine will run crazy rich.

JRMichler · 06-08-2014, 02:49 PM

Quote:

Originally Posted by RobertISaar

yes.

enough pressure and you can double fuel flow per time unit, causing an indicated 100% gain in MPG on a trip computer.

That much pressure will make the entire fuel tank go KABOOM, spraying atomized fuel in all directions, to be ignited by any spark. Result is a fuel air bomb. A big one.

ecomodded · 06-10-2014, 01:01 AM

What a Lark , the fuel gets all the oxygen when being sprayed threw injectors (about 45psi) or Jets on Carburetors ( 4-15 psi est.)

I did not see how many psi he uses for his pressurizing ( fail ) experiment , regardless of what psi he apparently used it would do nothing other then feed the fuel faster for a quicker drain, if anything at all.

Drill into the fuel tank ? now that's good advice..

ecomodded · 06-10-2014, 01:23 AM

JR I Believe the pressure could burst a seam / line with his rigged up tire pump as well let alone just pressurizing it , what hazard to put it mildly. Funny how he says he is cutting his fuel cost in half and thinking we are all stupid for not doing it.. He is a very Imaginative fellow.