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Re: 1938 Super 8 1605 - adventures with a newbie
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I would get rid of the filter between the tank and the pump. Any filter should be located on the discharge side of the pump. Filters on the suction side of fuel pumps are notorious for causing trouble.
All hose clamps on rubber fuel lines are subject to loosening, especially on cars that have sat idle. I'd snug all of them up. If you have a way to empty your fuel tank, I suggest blowing compressed air into the tank (with the cap OFF) through the fuel outlet line. Some tanks that have been cleaned and coated have a restricted fuel outlet line. This can cause fuel starvation, especially at highway speeds in hot weather. I'd remove the fuel filter between the tank and the pump and NOT replace it. I'd also cut open and visually inspect the filter. If it has much debris in it, you probably need to remove and clean out the tank.
Posted on: 2023/4/18 8:59
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Re: 1938 Super 8 1605 - adventures with a newbie
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Quote:
Thanks for the tips. I will remove the filter from the circuit completely and snug all up the connections. I may put a filter on the outlet side, or find a solution to fit in the stock bowl just before the suction side. -Kevin
Posted on: 2023/4/18 11:18
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Re: 1938 Super 8 1605 - adventures with a newbie
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A screen and bowl type filter might work on the suction side, but it would need to be kept clean and absolutely air tight. You'd also need to keep it away from any source of heat to avoid "vapor lock" issues. A large filter would be preferred over a smaller one. Any restriction in the fuel line from the tank to the pump will cause trouble.
Posted on: 2023/4/18 11:30
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Re: 1938 Super 8 1605 - adventures with a newbie
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The fuel pump and glass bowl location are far down on the driver's side of the engine, nowhere near anything that would cause heat. But because it is so low on the engine assembly, it would be near impossible to get to it when the fenders and sidemounts are back on. If I put a removable filter before the carb it would be directly next to the manifold, which I'm not sure I'm a fan of.
-Kevin
Posted on: 2023/4/18 11:38
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Re: 1938 Super 8 1605 - adventures with a newbie
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Disconnect the suction line at the pump and with some combination of hose and fittings hook a vac gage to it. Crank the engine over with the stater oh, maybe 10 revs. See what you get.
Posted on: 2023/4/18 11:52
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Re: 1938 Super 8 1605 - adventures with a newbie
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For the brakes, definitely pressure flush the system. If you don’t have a flusher, it’s time to get one and there are some available that are quite reasonably priced. A brake hand-bleeder pump might help but pressure from the master is better!
Posted on: 2023/4/18 12:31
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Re: 1938 Super 8 1605 - adventures with a newbie
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Don - The whole brake system has already been fully bled. We did the old two-person technique and went through 3-4 bottles to get clean fluid at all corners. The nasty green globs were within the wheel cylinder itself. I'll re-bleed the brakes after I get this cylinder back on there.
Ross - Here's a video of the fuel pump suction test. Looks like it was hitting 7 inHg every pump. I don't know if that's good enough or not. -Kevin
Posted on: 2023/4/18 22:48
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Re: 1938 Super 8 1605 - adventures with a newbie
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I was referring to flushing, not bleeding, which should force out the green gunk but you’ll also need to determine where it came from. In a lifetime (since the mid-‘60s anyway) of owning Packards I have never seen green gunk in even the worst system so it’s definitely not normal!
Posted on: 2023/4/19 14:27
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Re: 1938 Super 8 1605 - adventures with a newbie
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I haven't encountered green gunk in a brake system. It might result from a wheel cylinder sleeved with brass. Old, decayed brake fluid with high moisture might attack brass and generate a green oxide.
Posted on: 2023/4/19 16:05
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