 Barely a dribble, Fuel |
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| 930cabman |
 Jun 10 2024, 01:38 PM
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#1
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Advanced Member  Group: Members Posts: 3,618 Joined: 12-November 20 From: Buffalo Member No.: 24,877 Region Association: North East States 
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Tracking down a low fuel flow issue, it looks like it starts with the flow directly from the tank. Sure, it's a small steel line, but the flow is very little. If the pump is not receiving enough, how can it push anything back to the engine. Drawing a blank
carbs, pump in front |
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| Superhawk996 |
Jun 10 2024, 01:52 PM
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#2
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914 Guru Group: Members Posts: 6,492 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch
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Clogged filter sock in tank most likely based on what you’ve posted.
The other possibility is kinked fuel line coming out of the tank. Least likely but not impossible is that the tank isn’t venting. Pop the fuel cap - if flow improves it’s venting. |
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| 930cabman |
Jun 10 2024, 01:56 PM
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#3
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Advanced Member Group: Members Posts: 3,618 Joined: 12-November 20 From: Buffalo Member No.: 24,877 Region Association: North East States
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QUOTE(Superhawk996 @ Jun 10 2024, 01:52 PM)  Clogged filter sock in tank most likely based on what you’ve posted. The other possibility is kinked fuel line coming out of the tank. Looking through the filler inlet I can see the sock looks reasonable. Will pull the tank later to look for a kink. The number of options for this is very low |
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| fixer34 |
Jun 10 2024, 02:08 PM
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#4
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Senior Member Group: Members Posts: 1,170 Joined: 16-September 14 From: Chicago area Member No.: 17,908 Region Association: Upper MidWest
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Are you checking at the metal pipe coming out of the tank, or a rubber line attached to it? If rubber line, it may be swollen.
If the metal pipe, carefully push a a piece of copper (soft) wire into the hose and tank. It should go in a good 3-4 inches. Just be ready if it clears out something, you will get all the fuel flow you ever wanted... If that doesn't do it, then probably time to pull the tank. If I recall, getting that pipe off while in the car is not easy. Maybe drain the tank using a siphon pump. |
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| Jack Standz |
Jun 10 2024, 02:28 PM
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#5
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Member Group: Members Posts: 383 Joined: 15-November 19 From: Happy Place (& surrounding area) Member No.: 23,644 Region Association: None |
QUOTE(930cabman @ Jun 11 2024, 02:56 AM) QUOTE(Superhawk996 @ Jun 10 2024, 01:52 PM) Clogged filter sock in tank most likely based on what you’ve posted. The other possibility is kinked fuel line coming out of the tank. Looking through the filler inlet I can see the sock looks reasonable. Will pull the tank later to look for a kink. The number of options for this is very low You can see the fuel lines from under the car (and if you have a door covering the front fuel pump area, you can check the lines there too) without removing the tank. Good luck with the fix! |
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| 930cabman |
Jun 10 2024, 05:18 PM
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#6
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Advanced Member Group: Members Posts: 3,618 Joined: 12-November 20 From: Buffalo Member No.: 24,877 Region Association: North East States
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QUOTE(Jack Standz @ Jun 10 2024, 02:28 PM) QUOTE(930cabman @ Jun 11 2024, 02:56 AM) QUOTE(Superhawk996 @ Jun 10 2024, 01:52 PM) Clogged filter sock in tank most likely based on what you’ve posted. The other possibility is kinked fuel line coming out of the tank. Looking through the filler inlet I can see the sock looks reasonable. Will pull the tank later to look for a kink. The number of options for this is very low You can see the fuel lines from under the car (and if you have a door covering the front fuel pump area, you can check the lines there too) without removing the tank. Good luck with the fix! I am not running a return line, so one of the lines on the bottom of the tank is plugged up. I had my feed line on the wrong one, switched them and now the sock is doing it's job and the flow is much better |
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| fixer34 |
Jun 10 2024, 07:29 PM
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#7
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Senior Member Group: Members Posts: 1,170 Joined: 16-September 14 From: Chicago area Member No.: 17,908 Region Association: Upper MidWest
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It's usually the simple things...
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| Jamie |
Jun 10 2024, 07:50 PM
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#8
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Senior Member Group: Members Posts: 1,068 Joined: 13-October 04 From: Georgetown,KY Member No.: 2,939 Region Association: South East States
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That sock is a useless item, much better to install an external filter right out of the tank before the pump which can then be visually checked and easily replaced. (IMG:style_emoticons/default/WTF.gif)
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| 930cabman |
Jun 11 2024, 04:55 AM
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#9
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Advanced Member Group: Members Posts: 3,618 Joined: 12-November 20 From: Buffalo Member No.: 24,877 Region Association: North East States
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QUOTE(Jamie @ Jun 10 2024, 07:50 PM) That sock is a useless item, much better to install an external filter right out of the tank before the pump which can then be visually checked and easily replaced. (IMG:style_emoticons/default/WTF.gif) Yes, I always install a filter as soon as the fuel exits the tank and another in the engine bay before the carbs |
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