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Post by brucew on Aug 28, 2022 21:09:23 GMT -5
I recommend 5/16" steel. More volume equals a longer time to heat up. I agree. I always thought that that was why we(GM) had far less vaporlock troubles than Ford had towards the end of the carburetor era. Ford had 5/16” fuel lines while GM used 3/8”. In the Medicine Bow, however, we all had the same 1/4” steel lines except for maybe Grumpy, and, well, as the title of the thread says,,,,,, BW
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Post by Scoutpilot on Aug 29, 2022 3:48:42 GMT -5
How many had pumps had not been rebuilt within the last five years? How many had pumps with aluminum valves as opposed to brass?
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Post by rickg on Aug 29, 2022 6:51:51 GMT -5
repop JMP with primer lever.
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Post by brucew on Aug 29, 2022 10:17:24 GMT -5
My pump’s been on there since I put the engine together, I believe. Dont know whether it’s ever been rebuilt, I think not. BW
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oilleaker1
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Post by oilleaker1 on Aug 29, 2022 16:24:55 GMT -5
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Post by cline48 on Aug 29, 2022 17:00:42 GMT -5
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Post by Scoutpilot on Aug 29, 2022 18:18:58 GMT -5
I see a lot of craters in that top.
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Post by cline48 on Aug 31, 2022 17:22:08 GMT -5
I thought that I would try to clean up the craters on the bowl seat area on one of my fuel pumps. I lapped it with sand paper glued to a glass bowl. It did take very much effort to smooth it out.
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Post by btinsc on Sept 1, 2022 7:51:38 GMT -5
Neat idea. Looks good.
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Lee
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Post by Lee on Sept 5, 2022 17:50:33 GMT -5
My turn! 😂 So, here is where we tested temps, and what I used ☝️ I know a temp tester like this can vary quite a bit but this is what I had, and tried to maintain a like distance on each of the Jeeps to keep consistency in the test. Lee😉
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Lee
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Post by Lee on Sept 5, 2022 18:13:48 GMT -5
I’m still confused as to this issue, I always said vapor lock was a fuel delivery issue and I still for the most part think that. Shacks jeep was a real head scratcher, we built him a fresh engine over winter, he installed his original and rebuilt by the Boss A-C fuel pump and clocked over 1K miles on it before Wyoming with no issues and several days of driving at or near 100°…. Once on the trail in Wyoming (Camp was around 9200’ in elevation, 10,000’ + was common during the days on the trail)vapor lock was a constant issue, bubbles in the sight glass, polar a bit of cold water on it and away it would go!…. Nothing in his fuel supply to the pump changed from his previous engine, and he had the same pump on it, in fact the only difference would be the NOS camshaft that was installed in the fresh engine. So then, 1) Was his old camshaft wore excessively on the pump lobe, and the new cam giving a longer stroke on the pump ?2) He did change out some rubber and brass fittings on the inlet side of the pump and it did eliminate the large air bubbles in the pump, but we never did get the glass bowl to seal, it always had a vaccume leak around its circumference, why is that ?, we also installed a T in the suction line and added a vacume gage that read less than 1” of vacume at peak. Why is this, there is an ample supply of fuel to the pump ??. 3) A shot of the vaccume gage connection and gage at 12,000’ + on engineer pass in Colorado 4) After installing Oilleakers Car Quest all metal pump on Shacks Jeep he had no issues after ?.Lee😉
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Lee
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Post by Lee on Sept 5, 2022 18:27:07 GMT -5
My thoughts. 1) Heat is a non issue to a pump with a good supply of fuel ⛽️ Our temp test proved that, Bruce’s Jeep had the coolest temps and he had no shroud on the radiator, Muley had the highest temps and no issues with a shroud. 2) Todays fuel is most likely our biggest problem, gas is not what it was 20 years ago, and is nothing like what it was 75 years ago, it’s formulated for the environment and fuel injection systems today, not for our 75 yo atomizer 😂 3) Oilleakers Jeep, the fuel pump percolated like the coffee pot at the church bizzar and gave no fuel issues 😲 4) I run a chi-com split bowl pump, no issues, I also have a Walcks supplied replacement fuel tank 9-10 yo. 5) So we have all replaced the stock 1/4” line from the tank to the pump, is it possible the pick up line inside the tank has been corroded and may have pin holes in it, they are 75 yo at this point and no easy way to replace it.
Lee😉
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Lee
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Post by Lee on Sept 5, 2022 18:29:30 GMT -5
My thoughts. 1) Heat is a non issue to a pump with a good supply of fuel ⛽️ Our temp test proved that, Bruce’s Jeep had the coolest temps and he had no shroud on the radiator, Muley had the highest temps and no issues with a shroud. 2) Todays fuel is most likely our biggest problem, gas is not what it was 20 years ago, and is nothing like what it was 75 years ago, it’s formulated for the environment and fuel injection systems today, not for our 75 yo atomizer 😂 3) Oilleakers Jeep, the fuel pump percolated like the coffee pot at the church bizzar and gave no fuel issues 😲 4) I run a chi-com split bowl pump, no issues, I also have a Walcks supplied replacement fuel tank 9-10 yo. 5) So we have all replaced the stock 1/4” line from the tank to the pump, is it possible the pick up line inside the tank has been corroded and may have pin holes in it, they are 75 yo at this point and no easy way to replace it. Lee😉 I plan on a bit more testing at FCT….. Your thoughts & Comments please! 😎
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Post by rickg on Sept 5, 2022 20:02:59 GMT -5
Your thoughts & Comments please! 😎 fast forward to today, elev 3500, 87 no corn, 95+ deg. spent the day today in the 3A with Annie and Charlie chasing down fishing holes. (got skunked). there's a 5 mile grade out of banbury springs, hard pull. engine temps rose and held at 190-195, downshifted to 2nd gear 1/4 mile from the top, the jeep didn't miss a beat.
whats that got to do with the price of hay you ask? given the elevation, not much I reckon.
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Post by Scoutpilot on Sept 6, 2022 3:32:25 GMT -5
I do agree that the fuel itself is a huge contributing factor. But another question. Perhaps the size of the fuel line might also play into this? As well as metal vs. rubber? Or perhaps a combination of the two?
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