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Jul 21st, 2025 | | | | Joined: May 2017 Posts: 1 Moderated | | Moderated Joined: May 2017 Posts: 1 | Question to all: I have 58 Fleetside that I have been upgrading to disc brakes. Due to problems with the supplier, the truck has set in my garage for the last month and a half. Here is the issue: when getting the truck ready for test drive, first the rubber hose feed from tank to fuel line started spraying...I figured old rubber rotted out, no big deal, and replaced. After truck started for 2 minutes, the other rubber feed hose from fuel lie to pump sprouted as well. Replaced that. Started truck, ran for 5 minutes, then fuel started pouring out of carburetor gasket to base, and then truck would not run. Is it a coincidence that all rubber parts failing at once? Gas was new gas, truck was garaged the last 2 months...it has set outside since 1987 with no problems like this ever...any ideas? After I rebuild the carb, are there any other fuel related rubber parts that I am forgetting?
| | | | | Joined: Apr 2005 Posts: 7,442 Bolter | | Bolter Joined: Apr 2005 Posts: 7,442 | Been running ethanol? Ethanol combined with rubber products not designed for ethanol will spell deterioration at some point.ðŸ›
Last edited by Tiny; 08/10/2017 3:13 PM.
Martin
'62 Chevy C-10 Stepside Shortbed (Restomod in progress)
'47 Chevy 3100 5 Window (long term project)
‘65 Chevy Biscayne (Emily)
‘39 Dodge Business Coupe (Clarence)
“I fought the law and the law won" now I are a retired one!
Support those brave men/women who stand the "Thin Blue Line"! Hug a cop!
USAF 1965-1969 Weather Observation Tech (I got paid to look at the clouds)
| | | | | Joined: May 2005 Posts: 8,988 Sir Searchalot | | Sir Searchalot Joined: May 2005 Posts: 8,988 | 1. 2017-1987= 30 years, you know? Not the ethanol, just old rubber.
2. "New gas"/ethanol was not in it long. Over the long haul it will eat non ethanol compatible rubber including carb internals.
3. Ethanol can not sit 2 months. It will absorb water. Cause big problems. Motor won't run.
4. Treat gas if there is a treatment. Some treatments will add to the problem. Be careful. Most people doubt that these additives really work.
5. The pouring out gas at carb base could be a different issue. Stuck float, bolts loose, worn shafts....or it could be ethanol deterioration like; accelerator pump skirt, needle valve rubber, gaskets, etc.
6. Change all fuel filters and be sure their filaments are E safe.
7. Empty all fuel from tank and start over.
8. Look up "phase separation".
9. Our older trucks are not set up for this stuff. Maybe a water separator could be used after fuel pump. Haven't studied that idea. They use them on boat motors.
10. The E fuel will release certain types of fuel tank build ups that were not released before. This will cause big time clogging until all is gone.
11. Bottom line, read the pump gas signs. Try not to use that E crap on older classic vehicles.
12. Thank goodness that no O rings were used on our older trucks. The fuel pump has a rubber diaphragm!!!
Last edited by Tiny; 08/10/2017 3:13 PM.
| | | | | Joined: Mar 2010 Posts: 10,059 Renaissance Man | | Renaissance Man Joined: Mar 2010 Posts: 10,059 | What carb are you running?
Last edited by Tiny; 08/10/2017 3:14 PM.
1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission
| | | | | Joined: Jun 2011 Posts: 5,096 Crusing in the Passing Lane | | Crusing in the Passing Lane Joined: Jun 2011 Posts: 5,096 | Some auto parts people don't know the difference between vacuum hose and fuel hose.
Ed
Last edited by Tiny; 08/10/2017 3:14 PM.
'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
| | | | | Joined: Feb 2008 Posts: 212 'Bolter | | 'Bolter Joined: Feb 2008 Posts: 212 | I am about to replace my third fuel pump on my 55 235 in ten years. Something is going on. All have failed causing the engine to sputter and shut down. After I shut the engine down and wait for a few minutes it starts and runs fine until the next 25 or 30 minutes. All have been purchased from Napa. They just stand by the warranty and give me another pump.
Last edited by Tiny; 08/10/2017 3:15 PM.
| | | | | Joined: Apr 2005 Posts: 7,442 Bolter | | Bolter Joined: Apr 2005 Posts: 7,442 | Try to get them to order a Carter pump. May last a bit longer.ðŸ›
Last edited by Tiny; 08/10/2017 3:15 PM.
Martin
'62 Chevy C-10 Stepside Shortbed (Restomod in progress)
'47 Chevy 3100 5 Window (long term project)
‘65 Chevy Biscayne (Emily)
‘39 Dodge Business Coupe (Clarence)
“I fought the law and the law won" now I are a retired one!
Support those brave men/women who stand the "Thin Blue Line"! Hug a cop!
USAF 1965-1969 Weather Observation Tech (I got paid to look at the clouds)
| | | | | Joined: Jan 2013 Posts: 1,384 Shop Shark | | Shop Shark Joined: Jan 2013 Posts: 1,384 | Just a thought, do these pumps have an inlet filter screen behind the fitting?
Takes 3 years or so for it to become filled with debris?
Last edited by Tiny; 08/10/2017 3:15 PM.
| | | | | Joined: May 2005 Posts: 8,988 Sir Searchalot | | Sir Searchalot Joined: May 2005 Posts: 8,988 | Standard Chinese quality. 3 years is nothing to worry about. Quality: meaning diaphragm material not Ethanol compatible or just weak or it tears. Not much else can go wrong. Valve or spring maybe. Doubt if there is a filter. Should be a fuel filter before pump anyway.
Last edited by Tiny; 08/10/2017 3:16 PM.
| | | | | Joined: Mar 2010 Posts: 10,059 Renaissance Man | | Renaissance Man Joined: Mar 2010 Posts: 10,059 | I am about to replace my third fuel pump on my 55 235 in ten years. Something is going on. All have failed causing the engine to sputter and shut down. After I shut the engine down and wait for a few minutes it starts and runs fine until the next 25 or 30 minutes. All have been purchased from Napa. They just stand by the warranty and give me another pump. Did you disassemble any of the 3 pumps to see what failed? Diaphragm? Check valves?
Last edited by Tiny; 08/10/2017 3:16 PM.
1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission
| | | | | Joined: May 2005 Posts: 8,988 Sir Searchalot | | Sir Searchalot Joined: May 2005 Posts: 8,988 | He can't do that, they would not replace for him.
Last edited by Tiny; 08/10/2017 3:16 PM.
| | | | | Joined: Feb 2008 Posts: 212 'Bolter | | 'Bolter Joined: Feb 2008 Posts: 212 | No I did not open any of them up. I have a new gas tank all new gas line rebuilt carburetor and supposedly new fuel pump. Also there is a fuel filter before the carburetor. I think the additives in the gasoline are causing the material inside to weaken. .
Last edited by Tiny; 08/10/2017 3:17 PM.
| | | | | Joined: May 2005 Posts: 8,988 Sir Searchalot | | Sir Searchalot Joined: May 2005 Posts: 8,988 | It may make more sense to have filter before pump.
Last edited by Tiny; 08/10/2017 3:17 PM.
| | | | | Joined: Feb 2008 Posts: 212 'Bolter | | 'Bolter Joined: Feb 2008 Posts: 212 | That is something to consider.
Last edited by Tiny; 08/10/2017 3:18 PM.
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