Sorry for jumping in. I wish the fuel feed on a Holley 4150 was on the same side as the Pantera fuel tank and contemplated mounting the carburetor backwards. But I am not sure if the vents, metering block, and power valve would still work correctly. Thoughts? ________________________________ From: Garth Rodericks via DeTomaso <detomaso@detomasolist.com> Sent: Wednesday, June 25, 2025 7:48 PM To: detomaso@detomasolist.com <detomaso@detomasolist.com>; Ben Roper <ben_roper@yahoo.com> Subject: [DeTomaso] Re: New Member - engine dies under hard braking Install a one-piece vent tube. This will prevent fuel from flowing out your vent tube and flooding the carb. Instead, it will flow to the front bowl under hard braking. I had the same problem and made my own vent tube for my Pantera. See examples in these threads... https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.vintage-mustang.com%2Fposts%2F10877511%2F&data=05%7C02%7C%7C1c0719e724e74b239b2c08ddb442c7e5%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C638864921124397206%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=aua3g9O5jZkIeWvp5vlm0ppHFO1zGE4RvV7oOBiEA3c%3D&reserved=0<https://www.vintage-mustang.com/posts/10877511/> It's a popular mod for the off-road/Bronco crowd too. https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fclassicbroncos.com%2Fcarb_tricks.shtml&data=05%7C02%7C%7C1c0719e724e74b239b2c08ddb442c7e5%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C638864921124423009%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=iHxTFPu0FVFu0wdpk%2FBrzMNRD5KZ0aBN%2F1D%2BB%2FOqxKo%3D&reserved=0<https://classicbroncos.com/carb_tricks.shtml> Or, order one. https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.ebay.com%2Fitm%2F192886524715&data=05%7C02%7C%7C1c0719e724e74b239b2c08ddb442c7e5%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C638864921124439281%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=%2BubMNb9oHkNm%2Fa3PRhIFlnjqpufm7slXWQeZoMHzPJE%3D&reserved=0<https://www.ebay.com/itm/192886524715> https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.figspeed.com%2Fcarburetors-accessories%2Faccessories%2Fvent-tube-off-road-and-marine-4150-4160.html&data=05%7C02%7C%7C1c0719e724e74b239b2c08ddb442c7e5%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C638864921124453150%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=P2l%2ByxuC98PEWDPpEsoOE6MmY%2BMgkgy%2BX5e8HZPcJzo%3D&reserved=0<https://www.figspeed.com/carburetors-accessories/accessories/vent-tube-off-road-and-marine-4150-4160.html> On that note, I am having a very strange issue with hard braking. If I stab the brakes hard, the car will idle way down and even die. I did a vacuum leak test around the carb and intake manifold yesterday and didn’t find anything. However the car is equipped with an auxiliary vacuum pump on the booster so vacuum shouldn’t (?) be an issue. The carb floats are set center line, but I have a hunch I still need to lower the rear float despite the carb having whistle vent tubes it seems like fuel is flooding into the butterfly’s. I have read some posts by Asa regarding the carb being a real pain in the ass to tune, and the cam not hardly making any vacuum which are most likely contributing factors. But my hunch is that fuel is sloshing. What can I do to mitigate or test this? Sorry for jumping in. I wish the fuel feed on a Holley 4150 was on the same side as the Pantera fuel tank and contemplated mounting the carburetor backwards. But I am not sure if the vents, metering block, and power valve would still work correctly. Thoughts? __________________________________________________________________ From: Garth Rodericks via DeTomaso <detomaso@detomasolist.com> Sent: Wednesday, June 25, 2025 7:48 PM To: detomaso@detomasolist.com <detomaso@detomasolist.com>; Ben Roper <ben_roper@yahoo.com> Subject: [DeTomaso] Re: New Member - engine dies under hard braking Install a one-piece vent tube. This will prevent fuel from flowing out your vent tube and flooding the carb. Instead, it will flow to the front bowl under hard braking. I had the same problem and made my own vent tube for my Pantera. See examples in these threads... [1]https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww .vintage-mustang.com%2Fposts%2F10877511%2F&data=05%7C02%7C%7C1c0719e724 e74b239b2c08ddb442c7e5%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C638 864921124397206%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiI wLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C %7C&sdata=aua3g9O5jZkIeWvp5vlm0ppHFO1zGE4RvV7oOBiEA3c%3D&reserved=0 It's a popular mod for the off-road/Bronco crowd too. [2]https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fcla ssicbroncos.com%2Fcarb_tricks.shtml&data=05%7C02%7C%7C1c0719e724e74b239 b2c08ddb442c7e5%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C6388649211 24423009%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMD AwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sda ta=iHxTFPu0FVFu0wdpk%2FBrzMNRD5KZ0aBN%2F1D%2BB%2FOqxKo%3D&reserved=0 Or, order one. [3]https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww .ebay.com%2Fitm%2F192886524715&data=05%7C02%7C%7C1c0719e724e74b239b2c08 ddb442c7e5%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C638864921124439 281%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCI sIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=%2 BubMNb9oHkNm%2Fa3PRhIFlnjqpufm7slXWQeZoMHzPJE%3D&reserved=0 [4]https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww .figspeed.com%2Fcarburetors-accessories%2Faccessories%2Fvent-tube-off-r oad-and-marine-4150-4160.html&data=05%7C02%7C%7C1c0719e724e74b239b2c08d db442c7e5%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C6388649211244531 50%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIs IlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=P2l %2ByxuC98PEWDPpEsoOE6MmY%2BMgkgy%2BX5e8HZPcJzo%3D&reserved=0 On that note, I am having a very strange issue with hard braking. If I stab the brakes hard, the car will idle way down and even die. I did a vacuum leak test around the carb and intake manifold yesterday and didn’t find anything. However the car is equipped with an auxiliary vacuum pump on the booster so vacuum shouldn’t (?) be an issue. The carb floats are set center line, but I have a hunch I still need to lower the rear float despite the carb having whistle vent tubes it seems like fuel is flooding into the butterfly’s. I have read some posts by Asa regarding the carb being a real pain in the ass to tune, and the cam not hardly making any vacuum which are most likely contributing factors. But my hunch is that fuel is sloshing. What can I do to mitigate or test this? References 1. https://www.vintage-mustang.com/posts/10877511/ 2. https://classicbroncos.com/carb_tricks.shtml 3. https://www.ebay.com/itm/192886524715 4. https://www.figspeed.com/carburetors-accessories/accessories/vent-tube-off-r...