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Old 02-25-2004, 02:45 PM   #1 (permalink)
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Drinking straw part 2

Part 1

Ok....here is what we have now:
  • '78 FJ40
  • electric pump directly under the tank
  • mechanical pump
  • all new lines to the carb
  • carb feed is the lower line out of the newer style tanks
    vent is the side line out of the tank(feed line on older style tanks)
Original problem was no fuel to the carb on hot days...acts exactly like vapor lock. We found that the PO had plugged the vent line and our theory was that if no air can get into the tank, no fuel can get out. The tank now has the vent line open to the air. I went to the gas station to fill up, met a Cruiserhead...hooked him up with some stickers ..., then drove the beast home. Pulling into the drive, I noticed gas in the driveway and a nice gasoline trail heading down the street (Sure glad I didn't vent that back into the carb..thank you Jason M). I ran the vent line up the firewall, above the height of the tank, and it appears the problem is solved. Having the vent below the tank must have acted like a siphon. I believe the stock location for the vent line is on the carb and it acts like a fuel return line. Can someone dig up an emissions manual or look under the hood of their '78+ Cruiser and check for me? Also, does a stock '78 have a charcoal canister? I drew a crappy picture of where the lines go.
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Old 02-25-2004, 04:30 PM   #2 (permalink)
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I have a 78 cal. model 40 and it has a charcoal canister that vents to the vsv box on the drivers side front fender.
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Old 02-25-2004, 04:37 PM   #3 (permalink)
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Can you post a picture of that setup? Mine is also a CA '78.
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Old 02-25-2004, 04:45 PM   #4 (permalink)
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I dont have the stock motor any more, I did a v8 conversion. In order to make it all smog legal in Cal. I still had to run the vent tube from the charcoal canister to the carb on the V8.
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Old 02-25-2004, 04:49 PM   #5 (permalink)
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When I get home tonight I will look at my emissions manual and get back to you.
Mike
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Old 02-25-2004, 04:52 PM   #6 (permalink)
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of the two connections on the lefthad side of the tank(as viewed from the truck) the upper is the return line from the carb, andthe lower is the fuel pickup.

O the back left, there are three small tubes. those go to the separator, then to the charcoal canister, which then goes to the VSV, and into the carb...

The biggest tube is the gas fill(obviously) and the other medium sized hose connects to the fill neck...
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Old 02-25-2004, 05:20 PM   #7 (permalink)
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Quote:
Originally posted by cruiserbrett
of the two connections on the lefthad side of the tank(as viewed from the truck) the upper is the return line from the carb, andthe lower is the fuel pickup.

O the back left, there are three small tubes. those go to the separator, then to the charcoal canister, which then goes to the VSV, and into the carb...

The biggest tube is the gas fill(obviously) and the other medium sized hose connects to the fill neck...
I got that much figured out. What does the side vent go to?
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Old 02-25-2004, 05:39 PM   #8 (permalink)
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on my 68 with 74 tank, i ran that side port over to one of the three ports on right rear of tank. the other two i just tied together.
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Old 02-25-2004, 07:21 PM   #9 (permalink)
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the vent in your second diagram that is spewing is the return line from the carb. the carb should have a feed line and a return line. the line that is in your first diagram that goes in to the body by the fire wall should connect to the charcoal canister. the canister should have three line on it. 1 is the vent line from the tank and 1 that goes from the canister to the carb and the last one that goes to the manifold through the vcv valve just under the carb.
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Old 02-25-2004, 11:22 PM   #10 (permalink)
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I am running the Weber and don't have that return line connection anymore. I drove to work today and as long as the vent line stays higher that the tank, it vents correctly without spewing fuel. It isn't very hot out here yet so we will see. I stuck a fuel filter in the end of it as well. I heard it gurgle as I pulled into the driveway tonight.
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Old 02-26-2004, 02:16 PM   #11 (permalink)
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may help !

does this help your situation any ??

i hv the same problem, i need to vent my 70 fj40 tank but hv not decided how to do it. i don't hv a return line and i recently bought a pvc valve to use as a vent (air in / none out).



so you hv 1 feed line to pump and 1 vent line.
i am having acceleration issues and i think my non-vented tank is causing the fuel pump to hv problems drawing fuel from the tank after running for a while.
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