tacoma no power, misfiring, hesitating

5vz doesn't use a TPS. Video says 3.4, but it also says "tocome" so i'm not taking anything seriously at this point LOL

 

Most fuel pumps are suspended in about the middle of the tank with the pickup tube extending toward the bottom. Therefore the fuel pump would be "overheating" if anything lower than half a tank. This needs to die. It's not a thing.

He's not simply out of gas, I run mine below E more than that Seinfeld episode, and I'm willing to be 75% of everybody here does too. Fuel pumps fail, it happens.

end threadjack

 

okie dokey

 

It does have a tps.

 

Know the specific size adapter so i dont have to buy full kit and can borrow a tester?

 

Already gave it a once over looking for a vacuum leak?

 

You can just rent the kit. You don't have to buy it.

And yeah, it does have a tps idk what I was thinking.

 

i dont have a place like autozone or napa around here.

 

im certain it isnt a vacuum leak. for it to cause these level of symptoms it would affect the idle forsure and it doesn't.

 

http://www.customtacos.com/forum/127-1995-5-2004/111733-another-freeking-sputtering-problem-3.html

 

Gotcha, didn't realize it was only under load. And if I did, I forgot.

 

il try unplugging o2 tomorrow. its a denso i replaced just 2 months ago. I dont think its the fuel pump cause like i said in first post wide open throttle and the truck pulls fine. If i had low fuel pressure i would think thats where it would be giving me most issues?

 

Willing to bet money it's a coil pack. My truck did the EXACT same thing as your truck is doing. Can't remember the exact code that came up with the scanner, but it was the coil pack.

 

Code scanned. code for tps and Insufficient Coolant Temperature For Close Loop Fuel Control (Probably from me unplugging o2 sensor) On the scanner the tps shows 10% for no throttle and 70% at full throttle.

After this truck ran decent and i did a nice long wot run which basically confirms that fuel pump is fine.

 

Sounds like you were on the right track from the beginning.

 

Simple logic: which last longer a electrical motor running hot or cool?
The fuel pump is cooled by the gas. Keep it 1/4 or above will extend life of pump.

never seen a pump suspend in the middle of a tank. they sit standing up with a filter sock on the bottom.

 

simple logic ?

How hot does the fuel pump get,
and what is the operating temperature range of a fuel pump at X degrees F,
and how long MTBR failure rate for X temp on Y time ?

No, you don't know any of that. Stop making scary stories of a fuel pump running hot and...what, failing
on an empty tank ?

I've run my 18 year old 4runner to fumes a thousand times (reserve light is 40 miles to
empty, and anywhere from 41 miles to 60 after reserve pops, it will start to suck air and want to stall,
starting on hills or cornering) absolute max is 60 miles from reserve light on my 4runner if I am flatland and not cornering much

my 4runner fuel pump is frikin fine. stop making stuff up. old wives tale. you are NOT going to burn out the
fuel pump. you will stall before it can run that long on 'air'

you don't want to run on empty because it triggers a bunch of OBD codes when the motor
stalls and it takes a full drive pattern cycle to get the thing running and shifting like it used to...a minor annoyance

 

I digress..

15+ years as an ASE master tech auto mechanic. But what do I know.

 

pumps are designed to be internally cooled. the extra cooling may help but thats arguable. think most of the problem is the possibility of sucking air while doing a sharp turn or sucking up some floating sediment.

 

I don't think it's the cooling of the fuel pump motor by pumping gas through it, I think it's the gasoline that surrounds body of the pump that cools it more, hence keeping gas fuller can theoretically keep it from heating up as quickly. My bad if you were already seeing that side of it. Not trying to be capt obvious.
I've always heard the same as Jon states from the old timers. I've only changed out two failed fuel pumps. One was a Tundra first gen and the other was a Geo Metro. But both of the owners said they did regularly run the tank low. Not out, just low. Like until the dash light would come on. But I am not positive correlation equals causation in every case or even most cases.