Not wanting to replace the flooded canister, I took it out and BLEW air through the AIR vent and all the liquid gasoline came out of the two (purge and fuel) ports. One thing I learned from this experience (besides double-checking the lines), is something about the canister. I dropped down the fuel tank again and found out the RETURN and VENT lines were INTERCHANGED! I thought the vent hole is at the top of the sender unit.Īs for my next option, I'll probably replace the fuel regulator, after I run it through several warm-up/drive cycles and analyze the OBD2 scan logs. I wonder if the 3-inch difference is what's causing the problem in that maybe the vent tube (if there's such a thing) is within that 3-inch area. In the K3500 tank it was about 15.5 inches tall. I will lower the tank today (there's about 6 gallons in there!) and see if I inadvertently intechanged the return and vent lines.Īs for the tank swap, the only difference is, in the new (receiving 79) tank, the unit had to be compressed (its adjustable as to height) to about 12.5 inches tall. The sender/pump unit is at the peak of the tank. (Another hint: of course, the fuel cap is the old cap for the once tank-with-no-pump - the 98 cap won't fit on the old tank).ġ998 454 Vortec in a 79 Vandura G35 Dually B+ RV, 4L80E, BW4470/2.72-underdrive, ARB switchable 4.10:1 differential locker, 19.5 Rickson wheels, 34-inch 14-ply Bridgestone M724s.ġ987 Vandura 3500 5.7 (K) TBI / 700R4, Harbor Workmaster body.ĥ9EWW, thanks for sticking with this thread. In the meantime, anyone who knows what might have been going on when it flooded? (Hint: the '98 in-tank fuel pump/sender unit was swapped into an older, '79 tank). I'll start it cold again in the morning and see if I could duplicate the flooding. Everything was just right: idle smooth, canister dry, good throttle response, clean exhaust, I could rev it up to 4000 rpm with no sign of malfunction. Then I revved it up again and tried to duplicate the flooding. AT first the idle was rough, then it smoothened out. Once the engine warmed up, I noticed there's smoke coming out of the LEFT exhaust, while the right is pretty clean exhaust (I have a true dual cat/exhaust).Īfter turning the engine off for about three minutes and mopping the fuel spill, I started it again and had it idle for about 5 minutes. When I rev it up, it would stall past 1800 rpm, it drops back to 1000rpm even if I continue to give it more gas, then it dies.Ģ. After I immediately stopped the engine, I removed the fuel tank cap and noticed that there was a lot of pressure (vacuum?) in the tank.ġ.
Gasoline was literally pouring out of the canister. What causes the canister to FLOOD? It happened ONCE this afternoon when starting the engine cold.