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jmldn
Samba Member
Joined: May 08, 2015
Posts: 152
Location: London
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 Posted: Tue Jun 28, 2022 5:34 am Post subject: Fuel delivery issue |
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I got the old girl running and it sounds good although it stalls after 30 seconds or so. Tried bypassing the filter and noticed the fuel doesn't pour out of the tank feed tube, rather trickles a bit and stops. Would that sound like a blockage ?
Last edited by jmldn on Tue Jun 28, 2022 5:55 am; edited 3 times in total |
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DanHoug
Samba Member
Joined: December 05, 2016
Posts: 4789
Location: Bemidji, MN
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| Posted: Tue Jun 28, 2022 5:40 am Post subject: Re: Fuel delivery |
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ayup. with a clean tank the fuel flows out the tank outlet in a nice stream. there is a fine mesh, nylon screen over the outlet baffles that can get schmoo'd over. try pushing air back into the tank thru the outlet, it'll push away the dirt and buy you a very short amount of time before it plugs again. solution= new tank.
just for giggles, you COULD try the flow test with the gas cap removed in case the tank system is so sealed it is not letting replacement air back in.
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-dan
60% of what you find on the internet is wrong, including this post.
'87 Westy & '89 Westy both 2.1 4spd
Past projects can be found at--
www.thefixitworkshop.com |
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Silverghost500
Samba Member
Joined: August 01, 2018
Posts: 1087
Location: Atlanta, GA
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| Posted: Tue Jun 28, 2022 5:51 am Post subject: Re: Fuel delivery |
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Yep, sounds like you've got a clog of rust or debris in the tank somewhere. If it's the original tank and you're thinking about dropping it to inspect, might as well provision a new tank. It'll be well worth the investment as one less thing in the fuel system to have to worry about and give you future fits.
_________________
1986 Volkswagen Vanagon Westfalia "Von Westy"
Honda K24A converversion-Road Testing Phase
3-Speed Automatic
Von Westy YouTube Channel
https://www.youtube.com/channel/UCbhyZYxJEQrUuLnMbLleeIA |
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jmldn
Samba Member
Joined: May 08, 2015
Posts: 152
Location: London
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| Posted: Tue Jun 28, 2022 5:53 am Post subject: Re: Fuel delivery |
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| Just tried a pressure test and the gauge read 36 psi |
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jlrftype7
Samba Member
Joined: July 24, 2018
Posts: 3581
Location: Chicago
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| Posted: Tue Jun 28, 2022 6:18 am Post subject: Re: Fuel delivery |
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| jmldn wrote: |
| Just tried a pressure test and the gauge read 36 psi |
Pressure test is nice and a good thing to do, but VOLUME Flow is what you'd need to worry about since you've already seen a flow issue with no pump involved at the tank outlet. If your pump starves to try and pull gas of the tank, it's bad for the pump and generally not great running for the engine if you have pressure but struggle to provide enough volume to spray out of the injectors under loads. [Think bucking and jerking when you try to accelerate]
To add to this, when I first got our '84 Vanagon, I could remove the outlet hose, and with a 1/2 tank of gas in the tank, I'd see no flow out of the tube. It was that clogged. I dropped the tank to peer inside with a Boroscope type inspection camera, stuff everywhere, but mostly rust in key areas.
Sometimes you can clean this all out with some effort , but make sure the outer shell of your tank doesn't show key signs of rusting at the corners and along the seams. If it does, you're better off with a new tank and starting fresh.
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'68 Westy- my first VW and vehicle/Bus- long gone.- sold it to a traveling Swiss couple....
'67 Type 3 Fastback, my 2nd car- gone
'69 Semi-Auto Stick Shift Beetle-gone
2017 MINI Coopers, our current DDs
‘84 Tin Top - Hilga....Auto |
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jmldn
Samba Member
Joined: May 08, 2015
Posts: 152
Location: London
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| Posted: Tue Jun 28, 2022 10:46 am Post subject: Re: Fuel delivery |
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| jlrftype7 wrote: |
| jmldn wrote: |
| Just tried a pressure test and the gauge read 36 psi |
Pressure test is nice and a good thing to do, but VOLUME Flow is what you'd need to worry about since you've already seen a flow issue with no pump involved at the tank outlet. If your pump starves to try and pull gas of the tank, it's bad for the pump and generally not great running for the engine if you have pressure but struggle to provide enough volume to spray out of the injectors under loads. [Think bucking and jerking when you try to accelerate]
To add to this, when I first got our '84 Vanagon, I could remove the outlet hose, and with a 1/2 tank of gas in the tank, I'd see no flow out of the tube. It was that clogged. I dropped the tank to peer inside with a Boroscope type inspection camera, stuff everywhere, but mostly rust in key areas.
Sometimes you can clean this all out with some effort , but make sure the outer shell of your tank doesn't show key signs of rusting at the corners and along the seams. If it does, you're better off with a new tank and starting fresh. |
I see your point, i'll drop the tank and go from there. |
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jmldn
Samba Member
Joined: May 08, 2015
Posts: 152
Location: London
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| Posted: Tue Jun 28, 2022 10:54 am Post subject: Re: Fuel delivery |
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| DanHoug wrote: |
ayup. with a clean tank the fuel flows out the tank outlet in a nice stream. there is a fine mesh, nylon screen over the outlet baffles that can get schmoo'd over. try pushing air back into the tank thru the outlet, it'll push away the dirt and buy you a very short amount of time before it plugs again. solution= new tank.
just for giggles, you COULD try the flow test with the gas cap removed in case the tank system is so sealed it is not letting replacement air back in. |
No better with the cap off.. |
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jmldn
Samba Member
Joined: May 08, 2015
Posts: 152
Location: London
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| Posted: Tue Jun 28, 2022 10:55 am Post subject: Re: Fuel delivery |
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| Silverghost500 wrote: |
| Yep, sounds like you've got a clog of rust or debris in the tank somewhere. If it's the original tank and you're thinking about dropping it to inspect, might as well provision a new tank. It'll be well worth the investment as one less thing in the fuel system to have to worry about and give you future fits. |
They're cheap enough i suppose. |
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skills@eurocarsplus
Samba Peckerhead
Joined: January 01, 2007
Posts: 16878
Location: sticksville, ct.
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| Posted: Tue Jun 28, 2022 11:04 am Post subject: Re: Fuel delivery |
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| Silverghost500 wrote: |
| might as well provision a new tank. It'll be well worth the investment as one less thing in the fuel system to have to worry about and give you future fits. |
i 100% agree
when i bought my van the tank was already out of it as the p/o was trying to repair the crossover pipe.
at any rate, like a fool i tried to clean the tank (not that it was bad) and had i known how cheap a new one was i would have never spent the time even fooling with the old one
and yes, pulling a line off the tank should result in a stream that shoots 4 feet away from the nipple
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Wildthings
Samba Member
Joined: March 13, 2005
Posts: 50348
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| Posted: Tue Jun 28, 2022 2:43 pm Post subject: Re: Fuel delivery issue |
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| Rig it up so that the fuel returning from the fuel pressure regulator to the tank instead goes into a quart jar and then run the pump and see how fast the jar fills. |
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