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Home > Help Needed / General Tech Chat > Fuel In Dump Valve

colas

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Member #: 102
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Pennsylvania USA

10th Feb, 2012 at 08:38:40pm

Hey

I'm having fuel issues, it's leaning out under load, or so I think, I can smell fuel at full throttle and when I took off my Dump valve there is fuel in it. The dump vavle is on the left side of the plenum over the master cylinders. Any ideas?

wez

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Stoke on Trent

10th Feb, 2012 at 09:04:31pm

wont the fuel in the dump valve come from the vacuum tube to the inlet manifold?

one day boost will be mine!

On 10th Mar, 2012 Joe C said:
TBH peple stick it everywhere... and theres merits to each...

stevieturbo

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Member #: 655
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Northern Ireland

10th Feb, 2012 at 11:05:53pm

If the DV is mounted very close to the mouth of the carb, it's no surprise some fuel will pass through it.

It'll just get spat back out through the carb when you shut the throttle and the air changes direction. Maybe not huge amounts, but it's going to happen.

Or it's also possible the DV isnt sealing properly under boost, and some is escaping then ( even if the air/fuel should be going into the engine )

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will


Miniwilliams

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Proven 200+bhp & Avon Park 05,06,07 Class D 3rd place

11th Feb, 2012 at 09:52:58am

Some thing to try is to mount it so any fuel in there can drain back out down the pipe.

Best 1/4 mile 13.2 seconds @116 mph
First 5 port miniturbo to make over 200 bhp on a carb?
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colas

566 Posts
Member #: 102
Post Whore

Pennsylvania USA

11th Feb, 2012 at 01:32:38pm

I did think it wasn't sealing properly, It's an old diaphragm valve. I have a new one now a piston one and I'm putting it on this weekend. I was just surprised to see fuel in it.

Thanks


Joe C

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Carlos Fandango

Burnham-on-Crouch, Essex

11th Feb, 2012 at 01:39:55pm

uncrew the diagram one and have a look, it should be obvious if it wasnt sealing.

or lust suck/blow on the small pipe.

On 28th Aug, 2011 Kean said:
At the risk of being sigged...

Joe, do you have a photo of your tool?



http://www.turbominis.co.uk/forums/index.p...9064&lastpost=1

https://joe1977.imgbb.com/



theoneeyedlizard

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The Boom Boom speaker Police!

Essex

11th Feb, 2012 at 02:12:03pm

Make sure you don't get fuel in the piston one. The seals swell up and tear in no time.

In the 13's at last!.. Just

colas

566 Posts
Member #: 102
Post Whore

Pennsylvania USA

11th Feb, 2012 at 05:26:01pm

How do I stop fuel getting in there?

stevieturbo

3594 Posts
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Post Whore

Northern Ireland

11th Feb, 2012 at 07:15:58pm




On 11th Feb, 2012 colas said:
How do I stop fuel getting in there?


Dont mount the DV so close to the carb.

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will


haimesyboi

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Cornwall

11th Feb, 2012 at 10:38:46pm

Where is the signal pipe for the valve connected? There is always going to be some fuel vapour there, I would go with an uprated diaphragm much more resistant to fuel. Also do you have a wideband? I would be concerned if there really was fuel coming out the valve from inside the plenum

colas

566 Posts
Member #: 102
Post Whore

Pennsylvania USA

12th Feb, 2012 at 02:23:44pm

The pipe is connected to the inlet manifold just in fron tof the carb. I have a sensor yes.
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