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  1. T

    Is this vapor locking, bad pump, or something else?

    For an additional data point: my 76 3/4 ton Suburban has a vented gas cap, a factory return line (& corresponding 3 line pump), and no evap canister. I believe most square body trucks and wagons above a certain weight (so most 3/4 and 1 ton) didn't have to have the evap system in place in the...
  2. T

    Truck runs very very rough

    I thought you had to download the video too, but you can actually just click on the vertical rectangle video screenshot at the bottom to play the video in the browser. @alwaysbroken Besides replacing the fuel pump, anything else that you changed, adjusted, or otherwise touched? Any maintenance...
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    454 shake and noise troubleshooting

    Got a call from the shop yesterday. They're replacing the camshaft and lifters, covered under warranty so at no cost to me. I'll get the details from the main tech when I pick it up later this week on what they found.
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    454 shake and noise troubleshooting

    Took it back to the shop, will see what they find. Lifters and camshaft were replaced last year so if it is that it should be covered under warranty. Doing some more reading, seems like it could also be due to a dropped intermediate distributor/oil shaft...
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    454 shake and noise troubleshooting

    I'll be taking it back to the shop but I did try a couple of things: took off the torque converter plate and the flywheel didn't have any cracks that I could see -- also I unplugged the spark wires 1-by-1 while the engine was running and it did not affect the tapping noise. I think that points...
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    454 shake and noise troubleshooting

    Took it back to the shop. Indeed, they had restabbed the distributor slightly askew and there was a stuck plug wire pin (not sure on which end) that needed to be fixed. No shake and no bouncy tach anymore. They also changed the oil so we're good to go there. However, I'm still hearing this...
  7. T

    Which aftermarket LED headlights?

    I'm a huge fan of the Holley Retrobright LED headlights. You can get them in a warm or cool white color. I've had both and they both deliver a crisp cutoff line and a great fill in front of you. Yes, they're very expensive but it's simple to install and it levels up your night vision to any new...
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    Tow/camper passenger mirror addition

    I have the tow/camper quad-leg side mirrors on my Suburban which I like the look of. However, the passenger side mirror is pretty much worthless as it sits due to the wing/vent window weatherstrip covering most of it from the driver's POV. I know I can swivel the head of the mirror outward but...
  9. T

    454 shake and noise troubleshooting

    First thing I did was check the firing order but it came back right (1-8-4-3-6-5-7-2). #1 on the cap was pointing toward #1 cylinder as before.
  10. T

    454 shake and noise troubleshooting

    I do need to hook my vacuum gauge and get a feel for where I'm at now. I had it up to 19" of mercury before. There's not that many vacuum hoses on this setup (manifold to AC/cruise/transmission, brake booster, pcv, choke pull-off, and vacuum advance) and they all seem fine. I don't hear any...
  11. T

    454 shake and noise troubleshooting

    I had my 76 C20 running really well not too long ago. Took it on a 800 mile trip and it idled, cruised, and accelerated very well. Smooth 650rpm idle and no bogs. Smooth speedo and tach. Recently I had also refurbished and tuned the quadrajet. I sent it in to my shop to fix an oil leak. They...
  12. T

    1978 Suburban just came in to a local yard

    @HotWheelsBurban I'm up Cypress way but have family on the east side by I-10 and the beltway so I can hit up the Wallisville location next time I'm around there.
  13. T

    1978 Suburban just came in to a local yard

    @HotWheelsBurban Appreciate the heads up as I'm in the Houston area myself. If you do make it out, mind checking to see if any of the square Burbs have the rear AC system in place? Looking to add that to my 76 Burb.
  14. T

    Gas spilling when filling up

    Finally got to a happy ending. I loosened the nuts on the bolts holding up the tank a bit to lower the tank by 1/4 or 1/2 an inch in case the angle was too shallow for the filler hose. However, I think the real issue was that the fuel filler vent hose was kinked. I left the hose pretty long...
  15. T

    Cruise control inop

    I have more or less a functional cruise control but here's my takeaways for anyone dealing with this as well: - I was able to use a volt/ohm meter, vacuum pump, and the factory service manual to test the different key components (transducer, servo, brake switches, vacuum lines, and cruise...
  16. T

    AC noise under throttle

    In case anyone faces this issue in the future: for me it turned out to be the AC compressor. It cycles on and off every 15 seconds and when doing so it generates that sound that sounds like air being released. The clutch also aggressively, it seems to me, catches the belt and that leads to...
  17. T

    Help diagnosing engine noise

    Today I pulled out my trusty smoke machine and connected it to the vacuum booster vacuum line. No leaks from the carb or intake but there was a real nice big smoke trail coming out one side of the manifold vacuum tee. Earlier in the week I had a shop install headers and they must have...
  18. T

    Gas spilling when filling up

    Here's where we're at: - Dropped the tank. I thought it only had a quarter tank left but it actually had half so it was quite heavy. - Filler and filler vent hoses were toast (old, cracked, hard) but the sender and other lines seemed OK. I'm thinking the original issue was that the filler vent...
  19. T

    Help diagnosing engine noise

    @PrairieDrifter I snugged up the brake booster connection at the back of the carb when I put the QJ back on the intake but I'll feel around it just in case there's something off there. However, I didn't check the other end of the booster line so that's a good call. There's a vacuum tee off of...
  20. T

    Help diagnosing engine noise

    Video of engine bay Details: Stock QJ, stock intake, stock cam, headers, no EVAP equipment (factory), 18-18.5 inches of mercury vacuum at idle I can’t figure out if the droning/burbling/hissing noise I’m hearing is normal or not. I thought it was a vacuum leak but all the lines in the bay have...
  21. T

    Gas spilling when filling up

    The hoses do look pretty old and tired, so these are both potentially in play here. I've ordered a 40g tank + straps + hoses/clamps for a full refresh from LMC & Rockauto. Once they arrive, I'll take the tank down and get a closer look at how the lines are currently configured and the shape of...
  22. T

    Gas spilling when filling up

    There's no evidence of any EVAP equipment ever being on the rig so I think your comment about open venting makes sense. The spill happens somewhere close to the middle of the truck, near the tank itself (so not by the filler neck). I think that reduces the likelihood that it's the hard lines...
  23. T

    Gas spilling when filling up

    It's a Suburban so no saddle tank and no spare tire delete, it's a rear tank mount.
  24. T

    Gas spilling when filling up

    Fuel pump has 3 lines, one from the tank, one to the carb, and a return line. Also, I just replaced the gas cap due to getting distracted while filling up and forgetting to put the cap back on so it's probably not that. I have no issues with either fuel leaking when the car sits in the garage...
  25. T

    Gas spilling when filling up

    When I fill up my stock 25 gallon tank at the pump, the pump stops/clicks as normal when full and shortly thereafter I can hear gas spilling. Looking underneath, I can't quite pin point where the spill comes from other than the general tank area. Other than that, vehicle works great -- fuel...

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