fuel

  1. iboughtatahoe23

    91 octane vs e85 in flex fuel Tahoe/suburban?

    Which of these is better? I wanna save money of course but if 91 octane overall will increase longevity of the vehicle than by all means Idk if it matters but the winters are harsh and the summers are hot here.
  2. A

    Fuel Relay

    Good Evening everyone ! My truck is a 2021 Tahoe LS and I've run into a problem where my Fuel relay (in the fuse box) has become loose and no longer sits tight in the socket, which of course, is causing the truck not to start. Anyone have an idea what can be done here ? Thanks Al
  3. F

    2005 5.3 lm7 Major issues!

    I have a 2005 Tahoe z71 with a new/reman 5.3 lm7 that had zero miles on it 2 years ago and is out of warranty. So to start I would place my mechanic skill level at 7 out 10, 10 being a master mechanic, Basing that on how good i am at installing parts not diagnosing and I am very good at reading...
  4. D

    2013 gmc yukon slt. Fuel pump fuse no power

    ok so about a month ago I pulled in my driveway shit it off ran inside for about 4 or 5 minutes. Came back out, jumped in my truck and hit the key. All it did was crank and crank. It didn't even try at all to start. Just cranked over. Now I've had my 2010 gmc yukon slt goin on a year and a half...
  5. jghjhj75

    Fuel type/ Maintenace Questions

    Hello, Asking for some advice and assistance into inspecting our just bought Chevy Tahoe PPV 2011 5.3L from a local dealership. I do have the old manual left in the glove box luckily but what are some lists of things I should inspect/Repair/drain-refill/ ect on these types of cars besides the...
  6. P

    injector upgrades

    got a 03 yukon denali 6.0 awd transmission is currently getting full build with upgraded internals. looking for recommendations for injector and in-tank pump upgrades over stock, will be installing top end kit in coming weeks (cam, lifters, rockers, etc.) most likely going with a fast lsx...
    • peirs13
    • Thread
    • fuel fuel pump injectors lq4 upgrade
    • Replies: 0
    • Forum: Performance
  7. R

    2003 Yukon won’t accelerate past 3,000rpm and chokes/sputters

    Hey all, I’m having an issue on my 2003 Yukon that seems to be fuel related. The truck had all the seals redone in the motor not too long ago, holds great oil pressure and runs smooth, but I’m unable to accelerate past maybe 1/4 throttle. The truck will sputter and back fire, and it gets worse...
  8. P

    Need help, gas tank

    I have a fuel leak in my 97 with 300k miles so I bought a new tank, pump & filter & figured I'd just replace them all. I now have learned that the 2dr & 4dr Tahoe's have different tanks & locations and 3 different sites told me to buy the 2dr one when I have a 4dr. What is needed to relocate the...
  9. D

    Fuel Question

    Hello there! My name is Nick and I just obtained a 96 4 door Yukon, did some diag and the fuel pump went bad. My question being, is that there are 4 hoses in total, 1 fuel fill, 1 vent, then they join at what appears to be a vacuum box, it has 4 nipples on it, and then the other 2 hoses go to...
  10. K

    Better startup with higher ethanol

    2011 Yukon Denali L94 6.2 Flex Fuel 160k miles... I had some stumbling on a dead cold start up after filling the tank a while back. Cleaned the throttle body and it ran better for a bit, I think it just brought up the idle till it recalibrated. Then I ran a tank of ethanol free premium and...
  11. K

    Fuel pressures

    Does anybody know what the fuel pressure should be with key on/engine off and what it should be with it idling? I got a 2007 Yukon denali 6.2. thanks in advance!
  12. 9

    Fuel Issue?

    I have a 1999 Tahoe LT with a 5.7L engine. It only has 44,000 miles since it was in storage for about 18 years before we got it. I've been having intermittent issues with it starting. It seems like a fuel issue because the engine will crank but not start. I can prime the pump by turning the...
  13. NE-KID

    Engine additives, fuel treatment and oil

    What do you guys and ladies use? I use ZMAX fuel and oil I tried some of the other brands like Lucas and etc I like ZMAX works really well and never failed me.

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