Ridgeline 25 Gallon Gas Tanks

[DogBoneRTL]

I gotta say....


On thursday when I read this post I thought no way it could hold 25 gallons. But to my suprise thursday after work I ran the tank pretty dry and put in just over 24 gallons. (I figure I had about a gallon or so in the tank). I think the pump I used was pretty accurate. The pump stopped where it normally would. When I carefully put more and more in I was suprised to say the least.

Then I thought maybe the pump was off by almost exactly the same as the other pumps mentioned in this post, but what are the odds, right? Now looking down at my milage I am way further on this tank then I would normally be at half a tank. I also noticed when I filled up the fuel guage needle was closer to the F then it normally was. I drove almost 75 - 100 miles before the needle even started moving.

So if it doesnt hold more fuel, you guys tell me what's up?

[VoicesInMyHead]

Originally Posted by DogBoneRTL

So if it doesnt hold more fuel, you guys tell me what's up?

See, since you raised your Ridge and have those awesome Nitto Dune Grapplers on... your truck sits higher... Since we all know that air is thinner the higher you go, you have more room for fuel! Yeah, that's it!

Plus, I heard from my cousin's friend's little sister's step dad's brother-in-law's nephew's girl friend's grand father, that the engineers at Honda put bigger tanks in the Steel Blue Ridges.

[csimo]

The rated capacity of the fuel tank is 22.01 US gallons. That is not the total capacity of the tank, filler tube, and EVAP canister.

The tank needs air space to operate properly. The EVAP canister is designed for vapor... not liquid.

When you put over 22.01 US gallons in the tank you reduce the air space, saturate the EVAP canister with liquid fuel and fill up the filler neck tube.

In the days of vented tanks it would have just spilled on the ground. We're not allowed to do that anymore. Filling the EVAP canister with liquid fuel is wasting fuel. It won't be metered and will just be burned as a rich mixture. Do it often enough and you'll ruin the catalytic converters.

It's not a matter of "is it possible to put over 22 gallons in the tank", but rather "it's not wise to put over 22 gallons in the tank".

[r-squared]

Originally Posted by DogBoneRTL

So if it doesnt hold more fuel, you guys tell me what's up?

I dont suppose you feel like going back to that station with a portable can to do an accuracy check? Thats what I would do in theory, but who has the time for it...

[ridgelinef4i]

please forgive my fuel system ingnorance, in today's high pressue systems what does the evap canister do? Does it condense the gavs vapors in the tank? or does it filter out the fumes to vent to the outside? And how will that make the mixture rich? I thought that was controlled by the ecu. Thanks

I do not top off but to the nearest $0.25 which is not much fuel at todays prices.

[DogBoneRTL]

Originally Posted by VoicesInMyHead

See, since you raised your Ridge and have those awesome Nitto Dune Grapplers on... your truck sits higher... Since we all know that air is thinner the higher you go, you have more room for fuel! Yeah, that's it!

Plus, I heard from my cousin's friend's little sister's step dad's brother-in-law's nephew's girl friend's grand father, that the engineers at Honda put bigger tanks in the Steel Blue Ridges.

That has to be it! LOL

[csimo]

Originally Posted by ridgelinef4i

please forgive my fuel system ingnorance, in today's high pressue systems what does the evap canister do? Does it condense the gavs vapors in the tank? or does it filter out the fumes to vent to the outside? And how will that make the mixture rich? I thought that was controlled by the ecu. Thanks

I do not top off but to the nearest $0.25 which is not much fuel at todays prices.

We can't vent gasoline vapors to the atmosphere anymore. The system is essentially sealed. The gasoline vapors are introduced into the intake air system and burned. The vapor is included in the intake air calculations by the ECU and are not considered in the air / fuel ratio. So if you have a high concentration of gasoline vapors via the EVAP system they will just be burned as a richer mixture.

[nwsnowman]

In all honesty does it really matter if it is 22 gallons or 25 gallons? Would it make people feel better if it was 40 or 50 gallons? You do not get better gas mileage with 25 over 22 and in fact from reasons cismo stated it is probably worse and damaging to your Ridge, besides gas weighs about 6 - 6.5lbs a gallon so you are carrying around almost 20 more pounds, that has to be a drop in .1 or .2 mpgs! I am just kidding about that but seriously why are people so concerned about 3 more gallons? I am like ridgelinef4i, once the pump clicks I am to the next .25 or .50 and then I am done, no need to push it and I routinely get 21.5 mpg with 60/40 highway and city driving. In fact the pump states that, the EPA states it, and many post here state not to over fill the tank.

[zroger73]

Originally Posted by csimo

The vapor is included in the intake air calculations by the ECU and are not considered in the air / fuel ratio. So if you have a high concentration of gasoline vapors via the EVAP system they will just be burned as a richer mixture.

But... Unmetered fuel will drive the fuel trim negative just as unmetered air will drive the fuel trim positive. Yes, the base air/fuel ratio is based on maps that do not include unmetered air or fuel since it should not exist if everything is working as designed. That's the beauty of closed-loop fuel injection systems - they will keep the air/fuel ratio as close to stoichiometry as possible (except for lean-burn engines or during enrichment mode and/or open-loop when at or near wide-open-throttle.

In short, if extra fuel is entering the intake through the EVAP system, our wide-ratio air/fuel sensor will see the rich condition and trim injector times to compensate. Except under gross conditions (i.e. injector stuck open constantly pouring unmetered fuel into the cylinder or you drill a 1" hole in the intake manifold, haha), the fuel injection system will compensate during closed-loop mode.

[csimo]

Originally Posted by zroger73

In short, if extra fuel is entering the intake through the EVAP system, our wide-ratio air/fuel sensor will see the rich condition and trim injector times to compensate. Except under gross conditions (i.e. injector stuck open constantly pouring unmetered fuel into the cylinder or you drill a 1" hole in the intake manifold, haha), the fuel injection system will compensate during closed-loop mode.

The Wide Ration Air Fuel (WRAF) sensor is in the exhaust stream. The WRAF is another name for what other manufacturer's call an Oxygen sensor.

I really doubt any input ranging from zero lean to full rich of the EVAP system would or could be detected by the WRAF. The EVAP system is not intended to be a consequential factor.

I have not reviewed the Ridgeline EVAP canister, but I know some other brands use styrofoam in the canister and overfilling the fuel tank has caused significan problems. Don't know about the Ridgeline.