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Fuel pump noise |
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mtrosclair
AMC Nut Joined: Feb/05/2022 Location: Metairie LA Status: Offline Points: 474 |
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Posted: Mar/23/2023 at 7:12pm |
As I’ve been spending an inordinate amount of time under the hood of my car, generally the only noise that that engine makes outside of the fan is the fuel pump. But that got me thinking, how loud is a mechanical fuel pump supposed to be? I don’t recall the pump on the 196 being this loud when it was running. It’s a rebuilt unit, but that doesn’t necessarily mean it was rebuilt correctly. Sometimes it almost makes a tapping sound, located by stethoscope, while idling. I tried to take a video, but the Rush of air from the fan makes it impossible to hear. I would probably just replace it with an electric pump, however, I do have vacuum wipers, which I will certainly need at some point.
Edited by mtrosclair - Mar/23/2023 at 7:23pm |
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1963 Rambler Classic 550
Originally a 196, this one has a 199 from a 69 American. |
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FSJunkie
AMC Addicted Joined: Jan/09/2011 Location: Flagstaff, AZ Status: Offline Points: 4741 |
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It's normal for mechanical fuel pumps to make a rhythmic thunking noise. They aren't loud, but you can hear them with the hood up if you listen.
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1955 Packard
1966 Marlin 1972 Wagoneer 1973 Ambassador 1977 Hornet 1982 Concord D/L 1984 Eagle Limited |
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mtrosclair
AMC Nut Joined: Feb/05/2022 Location: Metairie LA Status: Offline Points: 474 |
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That’s good, sometimes it’s sounds like internal engine noise and it gets me nervous until I get the stethoscope out.
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1963 Rambler Classic 550
Originally a 196, this one has a 199 from a 69 American. |
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mtrosclair
AMC Nut Joined: Feb/05/2022 Location: Metairie LA Status: Offline Points: 474 |
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So the fuel pump noise which kept worrying me it was engine noise finally got too much to bear so I decided to do an experiment. I removed the mechanical fuel pump and temporarily installed ann electric fuel pump in its place. The cold valve noise I thought I was having was actually the fuel pump the whole time, the engine is quiet when it runs. I contacted the person that I bought the fuel pump from and they are going to send me a replacement, after I took it out I inspected it, and I observed that there was a full inch of travel in the arm before it contacts anything and even starts to push the pump, and it was very easy for the little arm to become detached from the push rod.
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1963 Rambler Classic 550
Originally a 196, this one has a 199 from a 69 American. |
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FSJunkie
AMC Addicted Joined: Jan/09/2011 Location: Flagstaff, AZ Status: Offline Points: 4741 |
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I don't think that was the right fuel pump. The arm doesn't look right to me.
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1955 Packard
1966 Marlin 1972 Wagoneer 1973 Ambassador 1977 Hornet 1982 Concord D/L 1984 Eagle Limited |
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mtrosclair
AMC Nut Joined: Feb/05/2022 Location: Metairie LA Status: Offline Points: 474 |
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That was a concern I had because I have seen pictures of this arm and the type with the contact pad on it. The engine did not have a fuel pump when I received it so I have nothing with which to compare the rebuilt pump. The replacement comes in today and I will see if its the same. Does anyone have a known correct fuel pump they would be willing to insect or photograph for me? Thanks
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1963 Rambler Classic 550
Originally a 196, this one has a 199 from a 69 American. |
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mtrosclair
AMC Nut Joined: Feb/05/2022 Location: Metairie LA Status: Offline Points: 474 |
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So, update time. I received the replacement fuel pump, and it is visually identical to the one that I had before, the free movement of the arm appears to be about the same. I installed it, and it does not make the “clack clack clack” noise the previous one did, this is more of a “thunk, thunk, thunk” type pumping sound. Which I believe is correct for a fuel pump. So, I’m not sure what the issue with the original one was, but this seems to have resolved it.
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1963 Rambler Classic 550
Originally a 196, this one has a 199 from a 69 American. |
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wittsend
AMC Nut Joined: Apr/15/2020 Location: California Status: Offline Points: 413 |
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Perhaps the diaphragm spring in the old pump is broken? As to the electric pump, I'm glad it worked where you installed it but typically it is mounted near the tank. The electric pumps push better than they pull. Regardless it all worked out and that is the only thing that matters.
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'63 American Hardtop
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mtrosclair
AMC Nut Joined: Feb/05/2022 Location: Metairie LA Status: Offline Points: 474 |
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It was located low enough to pull but I think it was too strong as it was overpowering the float, either way like you said it worked out and the cars running pretty good.
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1963 Rambler Classic 550
Originally a 196, this one has a 199 from a 69 American. |
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