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By Florida_Phil - 8 Years Ago
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Went for a long ride today in my '55 TBird. The cars runs great with no issues. When I pulled into the garage I heard a knocking noise coming from under the hood at idle. I recently changed the heads and rockers, so I thought one of my rockers had loosened up. The knock sounded like it was coming from the fuel pump. I used a long screw driver and the noise was not coming from the valve train like I suspected. I could definitely hear it coming from the fuel pump itself. I shut off the engine to let it cool down and the noise quit. The pump is an old 292 dual action pump with the vacuum lines plugged. Anyone ever had a fuel pump do this? I don't need the vacuum. Will a standard FE pump work in my 292?
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By charliemccraney - 8 Years Ago
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An FE pump will work.
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By oldcarmark - 8 Years Ago
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Florida_Phil (10/27/2017)
Went for a long ride today in my '55 TBird. The cars runs great with no issues. When I pulled into the garage I heard a knocking noise coming from under the hood at idle. I recently changed the heads and rockers, so I thought one of my rockers had loosened up. The knock sounded like it was coming from the fuel pump. I used a long screw driver and the noise was not coming from the valve train like I suspected. I could definitely hear it coming from the fuel pump itself. I shut off the engine to let it cool down and the noise quit. The pump is an old 292 dual action pump with the vacuum lines plugged. Anyone ever had a fuel pump do this? I don't need the vacuum. Will a standard FE pump work in my 292?
Airtex 6523 is a correct Y-Block Fuel Pump with the Filter in the Bottom.
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By Florida_Phil - 8 Years Ago
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Wonder why the old pump knocks when it heats up?
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By Lou - 8 Years Ago
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Because the pump is trying to suck vacuum but can't because the lines are plugged. Knock is the Vacuum diagram snapping back.
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By Sandbird - 8 Years Ago
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Fuel pump with glass bowl filter on bottom won't fit on '55-'57 Bird because of interference with cross member. They relocated glass fuel filter bowl to top of the engine.
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By Dave C - 8 Years Ago
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The pump should have a spring that forces the pump arm to follow the eccentric. Sometimes the spring will break or get weak enough that the arm sort of floats. When that happens it will make a knocking sound because the eccentric is coming around and hitting the arm since it isn't in contact with it.
I've seen this many times over the years.
Dave
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By paul2748 - 8 Years Ago
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Would the pump actually work if this was the situation? Or work incorrectly providing little fuel?
Dave C (10/28/2017)
The pump should have a spring that forces the pump arm to follow the eccentric. Sometimes the spring will break or get weak enough that the arm sort of floats. When that happens it will make a knocking sound because the eccentric is coming around and hitting the arm since it isn't in contact with it. I've seen this many times over the years. Dave
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By paul2748 - 8 Years Ago
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I have the vacuum lines plugged and never noticed any noise
Lou (10/27/2017)
Because the pump is trying to suck vacuum but can't because the lines are plugged. Knock is the Vacuum diagram snapping back.
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By mrmike - 8 Years Ago
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 I believe this is the pump that I installed after getting my electric wipers. Hope this helps Roll over image to zoom in Airtex Airtex 4208 Mechanical Fuel Pump 4.1 out of 5 stars 3 customer reviews
| Price: | $47.50 & FREE Shipping. Details |
Only 1 left in stock (more on the way). Ships from and sold by Amazon.com. This fits your . - Enter your model number to make sure this fits.
- Precision-cast units designed to meet or exceed OEM specifications
- Special heat treated rocker arms and case-hardened pins to ensure long-lasting performance
- Upgraded seals and pump diaphragms for compatibility with modern multi-fuel blends
- 100 percent tested throughout the entire manufacturing process for worry free, out-of-the-box performance
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By Florida_Phil - 8 Years Ago
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Thanks for the help. I'm just happy the noise wasn't a bad cam or a rod knocking. My car has the filter on the top of the engine. Another UPS truck at my door? What a surprise... :>
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By Ted - 8 Years Ago
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Florida_Phil (10/27/2017)
...Will a standard FE pump work in my 292?
Be forewarned that the FE fuel pump that has the fuel filter canister on its bottom will not clear the Thunderbird frame located directly under the fuel pump. In that particular instance, use a FE pump that does not incorporate a built in fuel filter on its bottom.
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By Dave C - 8 Years Ago
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The weak/broken spring never affected the performance of the pump. Cars ran fine, but sounded like a rod hammering.
Dave
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By Florida_Phil - 8 Years Ago
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Lou was right. I had plugged both fuel pump vacuum lines with rubber caps. As soon as I removed the outboard cap, the noise quit. Problem solved for now. Thanks!
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