 Strange running issue, Fuel tank vent? |
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| sdoolin |
 May 1 2018, 07:50 AM
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#1
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Member  Group: Members Posts: 359 Joined: 1-May 14 From: LouKY Member No.: 17,299 Region Association: None  |
73 2.0L, built to 2056 running dual Dellortos. I have just over 3k miles on the engine since the rebuild, and it has been running strong, and I have been loving it. Went to pick up my wife from the airport last week and about 30 miles into the trip, the car started running poorly. Really poorly. Had been all freeway miles, and I was running at 80+ MPH. Car had been running fAntAstic!
Felt like it was running on 3 cylinders, and running out of gas. No strange/unusual mechanical noises before poor running, or during poor running. Completed the next 5(ish) miles to the airport and strangely, once I slowed (exited the freeway) the engine picked back up and began to run normally again. Made the 40(ish) mile trip home, running poorly the entire way. Pulled into the garage, shut the car off and heard the STRANGEST noise from in front of me. Sounded like the gas was boiling in the tank. Quickly opened the frunk and removed the gas cap. Large sucking sound on gas cap removal. So, I am thinking that my tank was not venting properly, not allowing proper fuel to get to the carbs? I have put another 300 miles on the car since this event - no more issues. I am running a 3 PSI pump, with a return line from the carbs. Anyone else ever experience this (or similar)? |
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| Mark Henry |
Jun 23 2018, 04:26 PM
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#2
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
I had similar symptoms, without the vacuum issue, from a kinked fuel line under the tank.
I agree insects could also be an issue, I have a hell of a time with sand dabbers here, they will plug any small hole. Pull the 3mm vent hose off the expansion tank and see what happens. |
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Posts in this topic
sdoolin Strange running issue May 1 2018, 07:50 AM
bdstone914 Did you not use the expansion tank and charcoal ca... May 1 2018, 08:04 AM sdoolin Gas tank is (as far as I know) original to the car... May 1 2018, 09:32 AM jvmarino Sounds like exact thing that happened to me a long... May 1 2018, 10:03 AM sdoolin This happened again. Lost power after 20 mins runn... Jun 23 2018, 11:19 AM
wndsrfr
This happened again. Lost power after 20 mins run... Jun 23 2018, 12:18 PM Mike Bellis I actually crushed a tank once without a vent.
Ma... Jun 23 2018, 05:03 PM |
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