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Fixing the Truck to Death – time to cut my losses?

89 GMC C3500 454 7.4L The leaking heater core a year ago was the beginning of the end as the truck was driven with little coolant. Temp gage did not indicate a problem. I flushed the system when I replaced the heater core and it seemed to run OK. It doesn’t get used much as it’s primarily a dump...
- PlatonicSolid
- Thread
- Nov 13, 2023
- Replies: 61
- Forum: Engine Performance + Maintenance
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Finding TDC

89 GMC C3500 454 7.4L TBI - Installing new distributor. I see my current distributor has plug cables 45° off from spec. Spec would be moving them all 1 place counter clockwise per the manual. Figure I should make it right when installing the new distributor. If I line up balancer timing marks @...
- PlatonicSolid
- Thread
- Nov 11, 2023
- Replies: 5
- Forum: Engine Performance + Maintenance
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Replacing Filler Neck Evap Vent Tube with Copper water pipe

In the middle of replacing the fuel tank in the 89 GMC C3500XC and discover the 11” steel Evap pipe attached to the filler neck via 5/8 rubber hose is corroded to the point of having pin holes. Not sure why they didn’t just run a rubber line from the filler neck to the tank. Apparently you can’t...
- PlatonicSolid
- Thread
- Nov 5, 2023
- Replies: 16
- Forum: Engine Performance + Maintenance
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How to Remove Fuel from tank

89 GMC C3500XC 7.4L - I'd guess I have about 18 gallons of gas in the tank and I'm replacing the whole tank and fuel pump. I have a great siphon, but I can only get the 3/4" OD hose so far down the filler neck before it seems to hit something. Never gets into actual gas. I already damaged the...
- PlatonicSolid
- Thread
- Oct 28, 2023
- Replies: 11
- Forum: Engine Performance + Maintenance
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454 Sticky Throttle is a death trap

Hi All - New here - first real post. The patient: 89 GMC C3500XC 7.4L RWD AT Stock - Jasper engine installed 2007 - Truck purchased new by my parents It has many issues that I can live with since it's just a utility vehicle for me (radio and clock no longer function, intermittent wiper control...
- PlatonicSolid
- Thread
- Oct 30, 2022
- Replies: 54
- Forum: Engine Performance + Maintenance
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89 C3500XC 7.4L RWD AT Stock in CT

Hi All. Joined the forum to see if I can solve some of the many issues with this truck. It's a utility vehicle for me - not that I wouldn't love if it were pristine, but it's a bit late for that. The truck has been in my family since new - originally purchased to tow a 5th wheel. Paint was...
- PlatonicSolid
- Thread
- Oct 30, 2022
- Replies: 3
- Forum: Introduction