New to me H2 SUT 50,000 miles.
a blockage in fuel fill system. Takes 10-15 minutes for 20-25 gallons. Fill line or vent line blockage? Where to look?

FYI-tons of great info here.
thanks

 

Welcome to HF

 

Welcome to HF. This New Member section is strictly for introductions and NOT for Tech questions ... says so at the top. I MOVED your Tech questions to the H2 (which is more active) than H2 SUT section.

Scan it for historic codes and add the results to your question. Purge Valve or EVAP Vent valve are the suspects.

Read this: H2 Canister Vent Solenoid Repair

 

LOOK, your first post was made a sticky. Your second one digging up that 10 year OLD Thread won the You Dug Up The Oldest Azzed Thread of the Day Award to tack on your statement that you used the search and found your answer.

 

you charcoal canister is plugged up, and the charcoal beads have gone down the tubes going to the fuel tank blocking the lines, I had same problem with my 2004H2, they blew out the lines, replaced the charcoal canister and replaced the check-valve at the shop….cost was around $500.00, I spent a lot of time at fuel pump running on low speed fill because of this issue, also the shop said when you fill the truck and the fuel nozzle pops, don’t fill any more, filling more destroys the charcoal canister, and you have this problem again in no time…..

2004H2
2006H3

 

EVAP System is not venting properly
"Tighten Fuel Cap" Rabbit Hole - Hummer Forums - Enthusiast Forum for Hummer Owners

 

I had the issue. Fuel tank remove, blow out vapor vent lines, and replace. New charcoal canister $241.35. Total labor $300.00.