Wow I had no clue this was possible.

[nfpgasmask]

how far down does the fuel gauge have to go to get the fuel light to come on???
Ive never seen it come on yet..

I've wondered the same thing. I have never seen mine come on either. And that said, about 5 months after I bought my VX, I ran the gas down REALLY far. Like, below that last marker line, and the light STILL did not come on. But what did come on, was my check engine light. Not only that, my VX was running REALLY BAD. I was scared to death there was something majorly wrong. This was before I had a scan guage, so I do not know what code it was throwing. Anyway, I limped it home from the store parking lot where it started running rough and the CEL came on. After that, I changed the spark plugs with no change. I then took it to the closest gas station, filled up with a full tank of premium and used some of that tank additive that removes moisture from the gas tank. The CEL went off immediately and my VX never chugged like that again. Since then, I never let the tank indicator get below the last line. My feeling is that I got down to the last couple of gallons in the tank and started to suck up water or something. This caused the CEL and the rough running. I don't know why the low gas light never came on.

Bart

[JHarris1385]

If you think you have water in your tank. The next time it is low just unbolt the drain hole and let a little out.

[nfpgasmask]

If you think you have water in your tank. The next time it is low just unbolt the drain hole and let a little out.

Yeah, I just used a jug of that HEET stuff....

Bart

[JHarris1385]

UPDATE:

This is with conventional gas and 4 oz of Acetone. Obvious improvements but not enough. I would like to see in the 360s or so. But my tank and computer still need seasoning so I think by the 5th tank I will have my best output yet. I am currently on my fourth tank. This 345 is with some of the worse traffic yet calculated in it. It is Derby week around here for those of you that are familiar with the best 2 minutes in sports and this week = horrible traffic. I was in bumper to bumper for over an hour two days this week.

This came from 20.06 gallons of gas. =17.25 quite and improvement over my almost 10 mpg a year ago.

[blacksambo]

You guys really need to try Lucas Gas treatment. My wife and I almost always get 370 miles on on a 20 gallon fill up. Also, beware of ethanol, it will spoil your mileage. Honda does not recomend ethanol for any of its vehickes sold in New York State. Exxon/Mobil around here does not offer ethanol mixes so we stick with them, no matter what the cost.

[JHarris1385]

I am lifted with larger tires, that is the resoning behind some of my troubles.

[Pepino]

i only get around 260 a tank, thats 12 miles per gallon, so if i put ethanol it will help?

[JHarris1385]

Pep do you think you have excessive exhaust?

[Pepino]

maybe im not sure, how do i know whats normal and whats excessive?

[JHarris1385]

Just wondering if you are running rich, I was and had to replace my fuel pressure regulator. Do a serach and see if you can open it up and check the condition.

[VehiGAZ]

Pepino, something is waaaay wrong - your mileage should not be that bad no matter how fast you drive. I drive ~90 mph on the highway to VT and I get at least 13 mpg.

If you have an oiled air filter (like a K&N) then you should clean replace your Mass Air Flow sensor (MAF or MAS). It measures the air coming into the engine, which the ECU uses to decide how much gas to squirt into the cylinders. The FPR regulates the pressure of the fuel in the lines, which also affects how much gas goes in. If either one of those is off, so will your fuel mixture.

You can get a new or rebuilt MAF at AutoZone, or you can use CRC MAF cleaner.

[Pepino]

i thought i got average miles per tank (260) but if you think that i am that bad then i must be really bad lol
i have the normal filter the one that come stock of course i check it all the time and its perfectly clean, one time i got only 153 miles per tank thats like ifi was driving a ferrari!! but then i changed fuel filter and it went up to 260 and its been around there all the time!
what can i do! where can i find a fuel pressure regulator? how much are they? i know nothing about car mechanics i am 19 and have no idea about anything of this stuff, back in mexico i never had to change oil or fix anything as soon as there was something wrong my dad sent the cars to get fixed so your help is appreciated

[VehiGAZ]

Sorry to alarm you Pepino - I thought you were getting 150 miles per tank regularly. 260 miles per tank is about right if you drive hard on oxygenated (10% ethanol) gas like I do.

If you don't know your way around an engine, then changing the FPR is no place to start learning. Any mechanic should be able to take care of it for you - an hour's labor to install it plus the part, which you could get at an Isuzu dealer, online, or from an AutoZone or other parts store. It may help, it may not.

[JHarris1385]

Do a search on here about the fuel pressure regulator.

I disagree - It is a very SIMPLE instal. The hardest part of the install is getting an allen wrench to turn the rear bolt (honestly).

It is about $70 bucks and if you can get the allen bolt off it takes no more than 20 minutes. I did this install and I am no mechanic.

I jumped from about 10 mpg to about 14-15 with just that. I am now running 17.5 average - and dont forget I am lifted with bigger tires.

[JHarris1385]

Here is my thread on it:

http://www.vehicross.info/forums/showthread.php?t=10475