What did you do to your NBS GMT800 Tahoe/Yukon Today?

[01ssreda4]

Shots fired!

 

[seven9st surfer]

Next time this happens, take a rubber or plastic mallet and bang on the fuel tank. If it starts up after doing this, it is most likely your fuel pump.

Interesting. How does that work?

And this might be a coincidence, but if so, it's a big one. I've had it towed to the shop 4 or 5 times now. Each time, it's in my driveway, and won't start for like 2-3 days. But every time the tow truck picks it up and delivers it to the shop, it fires right up on the first try. Is there maybe something about the tilt from getting it onto the truck that would make it start again? Would a bad fuel pump do that? I always back into the driveway, so it's on a decline. Would that have an effect?

Also, I've never had any problems with rough idling or it cutting out once it's running. It's just about once every month or so, it refuses to start until I tow it to the shop, then it starts. It's driving me crazy.

 

[clandr1]

Interesting. How does that work?

And this might be a coincidence, but if so, it's a big one. I've had it towed to the shop 4 or 5 times now. Each time, it's in my driveway, and won't start for like 2-3 days. But every time the tow truck picks it up and delivers it to the shop, it fires right up on the first try. Is there maybe something about the tilt from getting it onto the truck that would make it start again? Would a bad fuel pump do that? I always back into the driveway, so it's on a decline. Would that have an effect?

Also, I've never had any problems with rough idling or it cutting out once it's running. It's just about once every month or so, it refuses to start until I tow it to the shop, then it starts. It's driving me crazy.

Sometimes the brushes/contacts on the motor inside the fuel pump get old, corroded, or dirty, and I've read online (never needed to do it myself) that a good whack on the fuel tank will jar the brushes loose, or jar them across the bad spot. This lets the fuel pump motor start spinning again, providing fuel to the engine.

Total shot in the dark, but it's easy, cheap, and worth a shot. Good luck with it! Let me know if it helps.

 

[JochenWoern]

Sometimes the brushes/contacts on the motor inside the fuel pump get old, corroded, or dirty, and I've read online (never needed to do it myself) that a good whack on the fuel tank will jar the brushes loose, or jar them across the bad spot. This lets the fuel pump motor start spinning again, providing fuel to the engine.

Total shot in the dark, but it's easy, cheap, and worth a shot. Good luck with it! Let me know if it helps.

I think it is the very similar situation with a starter, whack it with a hammer and it may turn a couple more times in order to get you home.

I am going to bet that it is your fuel pump and once you change the incline on the truck and the tow truck pulls it up on its bed, the angle changes and the fuel will get to the pump.

I am willing to bet that this never happens when the tank is completely full and the pump is fully submerged.
I was going to say that based on your sig pic, your driveway has an incline. Now you say you always back the truck into the drive, ..........pull in forward and I am as well going to bet that it will not happen as the pump will be submerged by the fuel as you changed the angle of the truck when it is parked in your drive.

What do you think? Does my theory seem to represent what is happening?

 

[Goodinblack]

Added more light inside. Replaced the 2nd and 3rd dome lights.
Anyone doing this, pay attention to the colors on the plug. Had to re-pin one, nothing major.

Is it really that blue?

 

[COUNTRY_BOY_TILL_DEATH]

I put in an HID kit today

 

[Maic]

Is it really that blue?

yeep.

 

[Yngbld32]

My opinion, ...................... and nothing more, ......................

Put your old wheels back on, as they looked much nicer than the wheels with rubber bands for tires.

Don't worry. I have my old 20s still. For when I want to blend in....

 

[chevync]

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Anybody want breakfast this morning? haha This is after less than 3k miles on a rebuilt engine, shop pulled the covers off yesterday and the shop called me and this is the first thing I seen, both sides are the same, we hasn't found the CASTECH emblem, he should have the heads off completely today and give me a call so I can check them out.

 

[seven9st surfer]

I think it is the very similar situation with a starter, whack it with a hammer and it may turn a couple more times in order to get you home.

I am going to bet that it is your fuel pump and once you change the incline on the truck and the tow truck pulls it up on its bed, the angle changes and the fuel will get to the pump.

I am willing to bet that this never happens when the tank is completely full and the pump is fully submerged.
I was going to say that based on your sig pic, your driveway has an incline. Now you say you always back the truck into the drive, ..........pull in forward and I am as well going to bet that it will not happen as the pump will be submerged by the fuel as you changed the angle of the truck when it is parked in your drive.

What do you think? Does my theory seem to represent what is happening?

That has to be it. Now that I think about it, I know the last 2 times it's happened it's been less than 1/4 tank. And for every single time it gets towed to fire up after that, it's not a coincidence. Would that throw a code though?

 

[JochenWoern]

That has to be it. Now that I think about it, I know the last 2 times it's happened it's been less than 1/4 tank. And for every single time it gets towed to fire up after that, it's not a coincidence. Would that throw a code though?

Sorry, not sure in regards to the code.

 

[clandr1]

That has to be it. Now that I think about it, I know the last 2 times it's happened it's been less than 1/4 tank. And for every single time it gets towed to fire up after that, it's not a coincidence. Would that throw a code though?

No, unfortunately a fuel pump going out/bad doesn't throw any codes.

 

[seven9st surfer]

No, unfortunately a fuel pump going out/bad doesn't throw any codes.

That's actually good news. I'm looking for anything that would cause it to not start and not throw a code. Ruled out the crank position sensor, looks like fuel pump is next.

 

[redemn93]

they arent too hard to do. get a friend or a 2x4 on a jack and drop the tank when fuel level is low. remove old pump, install new. go ahead and get a new lock ring too. they either get destroyed removing them or just pretty ugly from rust.

 

[Rangel]

they arent too hard to do. get a friend or a 2x4 on a jack and drop the tank when fuel level is low. remove old pump, install new. /QUOTE]

my projects NEVER go this smooth.

 

[07Burb]

Mine either I allot an hour and you might as well assume it'll be 4 hours LOL

 

[Rangel]

yup, when I tell my wife Im going to do xyz to the truck it will only take an hour. she just rolls her eyes. lmao

 

[redemn93]

im trying to give the guy some confidence here...but yah...never goes as planned. actually took me 2 days since i didnt have a new retainer ring and the pump lines were being a real ******.

 

[chevync]

Finally got a shop to pull the heads, he removed the valve covers and told me he couldn't find a castech emblem. Got a call this morning from him saying he pulled the rocker arms and found it, castech 706! So I went up there started looking for cracks after he removed both heads, nothing..I left, came back later with the oldman to pick up a sand blaster I got from him, took dad inside with me to show him the mess, i grabbed a flashlight, this time I looked at a different angle, and there is was a CLOSED crack about an inch long, very hard to see, also had a black spot on the end were the steam burned the oil to the head. We did a pressure test yesterday and it was holding at 12 psi cold, he didnt want to run the tahoe with the valve cover off. So the crack has ben opening when it warms up, once i get the heads to the house i'll get a good picture of it for the ones who have been having the same trouble, I ordered a set of 862 heads this time and GM OE gasket set and bolt, hoping to have it back up and running by mid next week.

 

[chevync]

Also ordered a catch can!