Jump to content

07 NNBS 5.3 Starts and Runs After Pulling Both Relay and Fuse to Fuel Pump

Smitty27
 Share

Recommended Posts

Smitty27 Enthusiast

Smitty27

Posted
Posted

Also, turn key on and hear the pump run so it's clearly not just residual fuel in lines.

 

Have seen older discussions of possible shorts in or faulty fuel modules up near spare tire causing this, do all who know concur with that as the main reason?    Any other experiences with this problem?
 

Trying to relieve fuel pressure so as to pull the fuel rail schrader valve and empty tank via the pump but so far can't get the damn pump to stop pumping.

 

thx

swathdiver Senior Enthusiast

swathdiver

Posted
Posted

In that year, there is no separate fuel pump control module.  The main computer controls the pump.  I don't profess to know everything but twice on '07s I've tried to interact with the fuel pump with a Tech-2 and was not successful.

 

Unplug it or cut it.

Smitty27 Enthusiast

Smitty27

Posted
  • Author
Posted

Actually it does.  Looked further in to it and see the "FSCM" (fuel sys control module) fuse so I pulled that and it finally stopped the damn fuel flow.  Question remains for anyone who knows - why is the fuel pump running with no fuse or relay?   Hate to see the circuit protection bypassed.

  • Like 1
Smitty27 Enthusiast

Smitty27

Posted
  • Author
Posted

Posted over there ages ago seems like, good memory.     I recall your name.  Wrapping the build up actually.   Swapped the 4L60 for a built 65, custom driveshaft, beefier springs/shocks for towing, etc.   she's just about done finally.    One of a kind.

  • Like 1
Smitty27 Enthusiast

Smitty27

Posted
  • Author
Posted

Huh?   So you're a mind reader and know what others "assume"?   You sound stable. I have no idea what you do or don't know and couldn't care less.  If you dont know what NNBS means, obviously it wasnt intended for you.  By your logic, my job is to explain every word I use in my posts so as not to "assume" you're not a moron?   What I DO "assume" is that if you dont know something I write you'll either ask or look it up.   

Smitty27 Enthusiast

Smitty27

Posted
  • Author
Posted

That's how I Iearnt it too, and found out a hell of a lot more about all the generations.  I'm the last to the party all the time so I just assumed everybody knew it.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing

  • Latest Articles

  • Posts

    • Chuck FB
      Oil Consumption

      By Chuck FB · Posted

      So speaking of oil consumption with my L8T as I just changed the oil yesterday and made the switch over to Amsoil SS 0W-40 from the Mobil 1  5W-30 Truck and SUV I just dropped out. 2900 miles on that oil as well as  68 hours on that oil ( so used to equipment with an hour meter and that becomes valuable information to compare with others as well ). Once again the oil use was so very little, I am going to say it dropped under 1/16 of an inch on the dipstick. No towing was done and this interval was from early spring until now.    One interesting item to note is that going by the 5 quart jugs I was using before from Mobil, it was showing that I was putting in 8 US quarts to bring it to full if not slightly over the full mark according to their jug markings. Granted I did allow more drain time this time and in part because the engine oil was only lukewarm as I started it and let it idle and not for long enough to get the oil itself hot ( the engine was up to operating temp ). The oil in that state just seemed to take forever for it to drip out but not only at the drain plug but at the oil filter housing as well, perhaps I had never quite gotten all the oil out before and I could have still waited longer but as it was I waited well over 3 hours. I think next time if I have the time I will do an experiment by dropping the oil and lets say leave the pan under it for 15 minutes, then switch to another pail and let it drip out overnight and measure how much more oil comes out. So this time and yes I ended up getting it just over the full mark as I was experimenting with trying to get the level to the add mark after I had run it and then waited some and then added a bit and waited for a certain amount of time for it to settle to the add mark. I very well may not have waited long enough for that experiment but I got to the add mark, then dumped in a full quart and waited some and checked and then waited some more and it crept up more ... and then finally oops, it was slightly over full some hours later when it really had settled all it would. I find this engine sure takes time for the last bit of oil that gets poured in to finally make its way into the crank case. I can only guess at how much too much I added as per maybe a 1/10th of a quart. I had poured in 8.5 quarts going by the quart containers as per 8 quarts and 16 us ounces. I was shocked at how much this was off compared to the prior oil changes and if those larger jugs and they are not marked accurately enough or they contain slightly more than what they say, or the drain time factor made that much of a difference. But I know on this forum there have been others who have said they have put well over 8 quarts in their L8T and now I have also going by the Amsoil true quart containers. Its a confusing convoluted mess up here in Canada with some oil manufactures packaging is in true US quarts, some is also in true US quarts containers on an even number of quarts but also marked in liters which becomes the odd ball volume of a fractional amount of liters. Then there is the Liters only containers, no US markings as its a true metric container and only measured in Liters to an even number of Liters. But remember we used to have Imperial Gallons and Imperial quarts as well !. 
    • Atlas
      2027 GMC Sierra: Official Discussion

      By Atlas · Posted

      Holy smokes. Clearly not a deal on that truck. I just mean in general, matte or painted trim is becoming more normative than chrome, but I know the Black Optics packages on various vehicles are being sold as uplevel trims. They look really good, but sheesh. It's just paint and plastic.
    • Grumpy Bear
      Some Assembly is Required

      By Grumpy Bear · Posted

      I Wouldn't Know Where to Begin    Oh I know where I would begin but I'm just one of over eight billion people on this rock. Eight billion versions of where the goal post is. How large it should be. How far to kick from. What ball is the right ball. Elevation. Age.....are you getting the point? It isn't about disagreeing with one individual. It's about agreeing only with one individual. One's self.   Agreement comes when multiple people hold the same point already. THAT is the goal of an education. Building the Social Contract. That thing that allows us to all read this sentence. We've agreed on the alphabet and how to arrange those letters into words we agree upon whose meanings hold true for everyone entering into that contract. Those words arranged into a sentence form an idea and several sentences strung together in a paragraph convey an argument for or against or inform the reader of a state, condition or perhaps reveal a things nature. Paint a word picture. Make oneself known.    This contract is not limited to words although they are often explained by words. Things like numbers and their usefulness. Physics, Chemistry, Medicine, Music, Art and so on.    The frequency of middle C (C4) is 261.63 Hz is a first principle. We build on that to make music we all can enjoy even if we all can not compose or play. You don't have to master it to make it enjoyable and useful.    So why is the Beginning so difficult? Why is agreement so elusive?   Everyone "Signs" the contract (when receiving that education in obtaining it)  but fewer and fewer in this world have any intention of living by that contract. They find exploiting that contract more advantageous. Disruption. With intent. Without intent. In Ignorance. In your face. With a double dog dare you. With a hold my beer. In resistance to that contract and in spite how it looks on us. It permeates the very air we breath.    In this way the contract is subject to advantage. Abide by it when it serves you, disregard it when it doesn't. Unpredictable and self-serving. Corrosive.....Toxic........   It says a lot about a persons character to disregard the contract, the truth, first principles. None of it good.        ********************************************************   https://medicine.yale.edu/news-article/character-vs-personality-who-we-are-and-who-we-aspire-to-be/   Just an interesting article.   
    • Jus Cruisin
      2027 GMC Sierra: Official Discussion

      By Jus Cruisin · Posted

      It costs $5,250 for the Yukon Nightfall option (black wheels, emblems and illuminated black GMC grill badge). What a "deal". 
    • Ralph Reale
      Android auto could not connect

      By Ralph Reale · Posted

      I keep getting the above error message on my 25 Sierra.  If I reset the infotainment unit (via the phone hang up button) it will work again for a day or 2.   But I dont want to do have to reset  all the time. Works fine in my 2023 Corvette. On both vehicles I connect wirelessly.   I have a Google Pixel 10 Pro XL, phone is up to date.  Any Ideas.  See attached  

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...