What have you done to your 1st gen Tundra today?

14.5mpg on the trip. 1mpg less than before the 285’s. Gauge is back up to full. We’ll see how she behaves. May just fill up at half a tank the rest of the trip.

 

Yea I made mine out of a thin piece of aluminum with a 1/8" thick rubber mat over the top. Took out all the "ribs" and feels better on my knees and created a nice flat platform to cook on.

 

Always fill above 1/4 tank. I usually try for 1/2 tank. Feels cheaper to throw $30 at it twice, instead of $60 all at once. But i guess the main reason i do it is for polo.

 

Would a vacuum issue make it do that? The cruise control functions through the vacuum system right?

 

It’s not the cruise. It did it regardless of cruise. It seems to be pump related.

 

Right, only saying, the resistor is a single-wire to the top of the pump, and works on a slide-based circuit, so any impact to the wire will make the resistance die off. Impact to a wire would also make the pump slowly fade and die off too. Both route thru the same connector. Hear me out for a sec.

Fuel pump relay has two legs coming off it, one direct to pump, one thru the fuel resistor and over to the BB1 connector (12-pin) under the driver's seat, then over to the fuel pump, which I think has a 5-wire connector (F10, it looks like, p/n

$13 90980-11077 Connector 5-way 5 pin Fuel Pump Compatible with Hyundai Black

90980-11077).

Weren't you doing truck stuff under the seat recently for stereo? Do you think you maybe disco'd or maybe pinched the wire harness that feeds the fuel pump, which connects somewhere under/next to the driver's seat? Didn't you have the driver seat out recently to do that stuff?

 

Didn’t pull either front seat. Pulled the rear and peeled the carpet back. No harnesses appeared to be harmed in the stereo adventure. I filled the tank. Gauge shows full. Running like a top now.

 

Stealing images from @BubbaW for a sec to show you where that connector is, vaguely. Will try to find a pic for you since you're on the road. This is the main bulkhead the fuel pump and fuel sender route through.

​

 

Could be the pump is dying a slow death then. It's potentially overheating when the fuel level is low and the pump is no longer immersed. But I'd still suspect wiring only because there are two circuits that are seeing impact, not just one. And the fuel sender doesn't use power, I don't believe, it's a very basic slider.

 

The truck ran totally normal as I’m watching the gauge drift down to below E. Once the gauge is down where you would be out of gas, the truck starts acting like it’s out of gas, even though it’s not.

 

how much gas did it take? How low were you really?

 

Did shawty have them apple bottom jeans?

 

boots with the fur?

 

It wouldn't impact the fuel pump sender, making the gauge change its level.

IIRC, the fuel resistor in our trucks (2000 is a bit diff't but similar from 2006) is a 1-wire lead going from a float slide on the side of the pump body/pump assembly. As the fuel float runs up and down the contact slide, it transmits different resistance to the gauge, depending on the slide level. The gauge needle in your dash is a glorified resistance meter. Sometimes the slide gets corroded spots along the length, and nothing will transmit back to the gauge when it hits those spots, which is when you'll hear people say stuff like, "It's weird, every time I get to 3/8 of a tank, the tank will randomly drop to E, then come back up when I make a turn!" or simila.

In some cars, on some fuel pumps, the float literally sits on a rail, and slides up and down the contact. On others, the float is at the end of an arm, and somewhere near the pivot there'll be something running along a contact. There aren't a ton of styles on the design, but many work the same way, i.e. you have some kind of circuit contact surface, with a float that rides on topof the gas, making something metal ride up and down the contact.

 

"I know what your problem is Mr, it ain't got no gas in it"
Edit: (BroHon, late to the party lol)

 

I too have experienced the same

The fuel pump is only cooled by the fuel in the tank. Don't let it drop that low or else it could be heating up. I've seen serval die like that before.

 

I had over a quarter tank

 

@Nimitz_ here is an example out of a Sequoia, which won't be identical to all 1st gen pumps, but it's close enough. Pay special attention to this part of the video below, this is the "slide" I'm talking about, which feeds resistance to activate the gauge in your dash. As the float lifts/lowers, it slides across this circuit path, which can ultimately wear out with time, or get "dead" spots in it, and a dead spot would make the cut out (read "E") suddenly. But it would take another event entirely to make the gauge slowly taper off, like the slow loss of signal (slow drop to "E") @KNABORES is drescribing. Even if the gauge went to "E", this is a resistance based circuit, one which (I don't believe) has any link to the fuel pump's power lines, so it going to E shouldn't cause the pump to cut off either.

​

https://www.youtube.com/shorts/6AFpb5CgU8s​

 

Took 18 gallons

 

In lighter news, still chewing through the miles

 

I misunderstood that the cruise control was making it do that.

 

Dunno about you, but supposedly we have 25-26gal tank. I can never seem to get more than 22 into the tank. I was on "E" with the light engaged recently, and drove it til the needle was dead-nuts to the E line, needle flush top and bottom, and it took 21.03 gallons.

 

Cruise control is a totally separate system. It won't cause the fuel gauge to change, nor the fuel pump to shutoff (or engine to die)/

 

I’ve put 25 gallons in mine before. Typical fillup when it gets somewhere below a quarter tank is around 20-22 gallon fillup.

 

I've filled just shy of 24 in my tank before, but I've heard there's 25-26 as well. I normally start looking for gas when I hit 200 miles on the trip though.

 

I never let mine get below half, very old habit born out of getting stuck in a blizzard long ago. I figure if I do it year round I won't forget to do it come Winter.

 

26.4 gallons capacity.

 

Upgrade for my sweet sweet ass. Swapped an 01 sequoia seat into my 06 DC. Airbag connector is the same but the sequoia seat is missing a few adjustments and heaters so the connector is different. Fortunately the person that owned it before me was relatively my same height.

New


Old

I also discovered the source of the interesting smell in my truck. My carpet cleaner is regretting the day it was born.

Stank

 

Well the seatbelts are different so she may go back to the street corner I picked her up from.

 

Can you grab the buckles from the wrecked sequoia? Or swap yours over? That should take care of that.