fuel

  1. K

    Help with rough startup, and randomly dies on a rare occasion from sputtering too much. 98 sierra 4x4 5.7l vortec

    This one is a pretty wonky one but suits me and my luck being (atleast most likely) something with fuel. The truck honestly drives great 90% of the time and being on the edge of hitting 500,000km. But when I go to start it up every single time it will sit there trying to start and alot of the...
  2. Astro

    Fuel tank question.

    Hey all, was thinking of upgrading to the 98+ style fuel pump on my 96 because offroading and fuel cavitation is no bueno. Had a problem with that going down a bouncy steep decline over the weekend Has anyone done that here? Can I use my 96 fuel tank? What all would I need to change? I checked...
  3. V

    Runs then when it sits a idle eventually it’s loses spark

    So the truck has a different motor in it now it is a 350 vortec still just came out of another truck that had no issue. It now will only runs for about 20 mins from cold to idle temp and starts backfiring really bad and eventually dies seems like low spark the only differences is has open...
  4. R

    454 low fuel pressure

    I have a 1999 7.4 vortec with both banks throwing lean codes. Bank 1 is just slightly above 10% sometimes but bank 2 is consistently 25%. Vacuum tested good @18. New fuel pump, filter, regulator and injectors. Fuel system harness was replaced in ‘21 and I’m still getting less pressure than I’d...
  5. D

    speedometer and fuel gauge not working (moon gauge)

    1988 chevy k2500 5.7 v8 as the title says, my speedometer and fuel gauge stopped working. ive already replaced the fuelpump, which came with the sending unit. whatelse could i look at? i bought another cluster and swapped the parts around and put in the new cluster all together. it continues to...
  6. A

    Dropping fuel pressure during a pull

    Alright, hopefully a relatively simple issue. I’ve got a 95 gmc with a lq9 and some bolt ons, 706 heads, and Texas speed cam. For the fueling it has a quantum 255 in the stock sending unit, -6an lines to a c5 vette filter/regulator, and 50 lb injectors. I’ll be doing a pull and I’ll hit around...
  7. AyyeItsGrizzly

    Fuel Tank Replacement

    Hello everyone, I have a 99 Tahoe 4 door 4 wheel drive. So I replaced my fuel pump about 9 months ago and found out that the original owners broke the locking bracket on the tank so they wood screwed the fuel pump down. My question today is I can’t find the fuel pump for my truck anywhere can...
  8. M

    1988 GMC K1500 Fuel Pump Relay Wiring -- Need Urgent Help

    So, I got this 1988 GMC Sierra SLX a year and a half ago, the original engine's oil pump got clogged up with some kind of silver flakes, radiator exploded, dropped a new engine in it, in the process of getting it dialed in and timed, a buddy advanced the timing way too far after I switched the...
  9. G

    Cheap fuel setup lm7 swap in 91' rcss

    I bought a brand new 96+ Vortec fuel pump and swapped it in from the weak tbi pump. I've done a lot of research on how to go from the stock fuel hard lines to the quick connects on my intake (with return). But with all an fittings added up I'm looking at $90+ just in fittings to go from the...
  10. Raspi454

    Fuel line replacement?

    99 tahoe 350 4 door 4x4 So my fuel lines are all rusted out, leaking fuel, and while I was at the parts store, the guy said he couldn't find a replacement. I came across this website >Fuel Lines< and was wondering if it's any good. They have various sets like pump to filter, filter to engine...
  11. Crankshaft Brad

    Front Half Fuel Line Replacement

    After my truck has been sitting for two years, because the engine was blown up, I finally got my truck running once again! bad news is that my front fuel lines are toast. I have fuel everywhere except in the throttle body... I can find the rear section of the fuel lines, but nobody has the front...
  12. CBenZ71

    At a loss with Fuel Gauge

    Hey everyone, I am stuck trying to fix my fuel gauge in my '99 K2500 7.4l. Background: It has a slight hummingbird issue with it, but more important it only reads 3/4 at full. This has happened recently because it used to go to full. Last weekend I dropped the tank and replaced the pump and...
  13. R

    What in tank fuel pump should I use in 5.3 ls swap

    I have a 97 k1500 work a 5.3 with all the factory cpu and fuel injection..it has the stock in tank pump for the 5.7 vortec still in it..the truck starts and runs fine till it warms up then it stays back firing and I think it's because the fuel pump isn't getting the correct amount of fuel and...
  14. S

    Ghost Problem 1995 Chevrolet Silverado Z71 5.7L

    Okay I have a ghost problem. 1 time out of 50 starts, when the truck starts it runs horrible like its missing or not getting enough gas. If I stomp the accelerator a few times the issue clears up. Any ideas to what this could be. Thanks in advance. I am also wondering if this issue maybe...
    • Steven Reeves
    • Thread
    • accelerator fuel miss reverse run stall start stomp
    • Replies: 0
    • Forum: The Garage
  15. A

    Abundant Fuel Pressure

    Happy new year to you all! I've concluded that my engine is getting 'flooded' with gasoline. There used to an MSD ignition system installed that created a more powerful spark. This has been disconnected, I'd like to keep it this way in order to pass inspection. However the old modified fuel line...
  16. CBenZ71

    1999 K2500 Fuel Tank Swap

    Okay, so I have a '99 K2500, 4 door that has the 25ish gallon fuel tank. I have been looking at trying to put a 42 gallon Suburban tank where the spare tire sits(I dont need the spare because I have 35s anyway) and removing the stock fuel tank. I have the 7.4 so I only get maybe 10 MPG city and...
    • CBenZ71
    • Thread
    • fuel k2500 suburban towing
    • Replies: 15
    • Forum: Towing
  17. S

    98 K2500 Fuel pump - brake pedal issue

    Recently did a engine swap on a 98 k2500 with the vortec 350 with automatic. Truck came in with a locked up motor so we don't know if this problem existed before hand but owner doesn't recall anything like this. Year of the donor truck was also 98. Truck starts and runs but as soon as you press...
  18. A

    5.3 swapped OBS fueling issues possibly wiring related HELP

    Hello all, I hope someone here can help me I am in a bind. I have a 5.3 swapped 95 Silverado. I reworked my harness according to lt1swap.com and made my own fuse/relay box following the direction of the website. I seem to be having likely a voltage issue that I need to diagnose. (Side note...
    • AaronP
    • Thread
    • 5.3 diagnosis fuel fuse lt1swap pressure relay security silverado vats
    • Replies: 11
    • Forum: LSX + Carb Swaps

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