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pgtips
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Joined: July 23, 2009
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Location: essex
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 Posted: Tue Jun 30, 2015 8:59 am Post subject: SOLVED - Petrol dripping from exhaust clamps |
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Hi,
as title says, I've got petrol dripping out of my exhaust clamps and I don't know why.
I had a fire last week which I thought was due to the petrol pump > carb clamp being loose (and it may have been) but today i tried to fire up again and my son noticed this. I have extinguishers to hand so no damage.
petrol dripping from exhaust clamps - both sides, not one.
From the top the engine is dry but the fact it is both sides means its not the pump or fuel line into engine bay.
Background is I had problems with my engine losing power and have took it out, a lot of chasing my tail but now I have replaced dual Kads with stock 34 pic 3, fitted new barrels and pistons, new petrol pump, filter, plugs & points swapped for electronic.
I've static set timing using a strobe. Threatens to fire up (thank god it didn't) then no show, flooding by the looks of things.
Flooding my floor with petrol. another fire waiting to happen.
So what have I done wrong. How can this be so, how does petrol get there unless chamber gets flooded and exhaust port on the head throws it out?.
Would incorrect B&P cause this. I am lost and quite scared to attempt to start the car again.
Any help really appreciated
PG
_________________
1975 1.8l FI Auto Westy - Subaru converted
1971 356 kit 1600 TP - semi/stickshift
1971 1302 LS - semi/stickshift
Trim ring info here -> http://www.thesamba.com/vw/forum/viewtopic.php?t=559668
http://www.thesamba.com/vw/forum/viewtopic.php?t=451210
http://www.thesamba.com/vw/forum/viewtopic.php?t=479721
Last edited by pgtips on Fri Jul 10, 2015 3:00 pm; edited 1 time in total |
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theDrew
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Joined: May 17, 2011
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Location: Camas, WA
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yammi450
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Joined: October 04, 2005
Posts: 149
Location: Las Vegas,Nv
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| Posted: Tue Jun 30, 2015 9:56 am Post subject: |
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| Don't forget the change you oil when you figure it out. It probably saturated with petro also. |
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Florida73SB
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Joined: March 26, 2011
Posts: 37
Location: Searcy, AR
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| Posted: Tue Jun 30, 2015 10:13 am Post subject: |
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The drip is on both sides with the 34PICT-3?
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1974 Super Beetle (SunBug?) in progress. 1699 (85.5x74), Scat C25, 1.25 lifters, dual Empi ECPs. Just a little bit more than stock...
Engineering is done with numbers. Analysis without numbers is only an opinion. ~ Law #1 of Akin's Laws of Spacecraft Design |
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pgtips
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Location: essex
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Florida73SB
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Joined: March 26, 2011
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Location: Searcy, AR
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| Posted: Tue Jun 30, 2015 10:23 am Post subject: |
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I would think you could clean it up, get it going, see where it's leaking, and shut it down again before any fire occurred. If it's dripping that much off the exhaust clamps down below, it should be flowing pretty freely somewhere up above.
_________________
1974 Super Beetle (SunBug?) in progress. 1699 (85.5x74), Scat C25, 1.25 lifters, dual Empi ECPs. Just a little bit more than stock...
Engineering is done with numbers. Analysis without numbers is only an opinion. ~ Law #1 of Akin's Laws of Spacecraft Design |
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pgtips
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Location: essex
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tattooed_pariah
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Joined: April 24, 2006
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Location: El Cajon, CA
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| Posted: Tue Jun 30, 2015 11:18 am Post subject: |
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I'm going to state the obvious just because normally for me, the obvious solution is the one I overlook the easiest..
A) is the carb itself wet? is fuel leaking out of the inlet and dripping/running down the manifold?
B) feel around by the spark plugs where the manifold bolts onto the heads, is that area wet?
If both of those are dry, it's not a manifold/carb problem (I don't think anyway..)
C) Check your fuel line, is it possible it has a puncture, rip, tear, whatever?
I'm guessing it's a mechanical pump, so you can't get it pumping without the engine running.. Having put out a few engine fires myself, I understand your fear about starting it, but
D) can you have someone else start it for a second so you can observe if there is gas spraying out of anywhere (pump inlet/outlet, fuel lines, carb inlet, manifold, etc..)
When did you last check your valve clearance? Did you verify, without a doubt that your cam was indexed properly while the engine was out (if you split the case), are the correct valves opening/closing at the correct time is what i'm getting at. Maybe for whatever reason the intake/exhaust valve overlap is going in such a way that your intake stroke and exhaust stroke are miraculously lining up so gas is going straight through the cylinder and never compressing/firing?
uhhh, I think those are all my ideas for this.. hope something helps!
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pgtips
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Joined: July 23, 2009
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Location: essex
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| Posted: Tue Jun 30, 2015 1:05 pm Post subject: |
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I checked everything few day's ago as it went back together. Ive just turned it over again with blue tissue dotted around the engine.
It turned over and the petrol leak started again from exhaust clamp area. The top half of the engine, all tissue, was dry. It looks to me like my great exchangers are filled with fuel and whatever the source they are topping up and spilling over. There is no other way fuel can come out there. Top of clamp is it's .
What have I done so absurdly wrong, it's killing me.
_________________
1975 1.8l FI Auto Westy - Subaru converted
1971 356 kit 1600 TP - semi/stickshift
1971 1302 LS - semi/stickshift
Trim ring info here -> http://www.thesamba.com/vw/forum/viewtopic.php?t=559668
http://www.thesamba.com/vw/forum/viewtopic.php?t=451210
http://www.thesamba.com/vw/forum/viewtopic.php?t=479721 |
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Florida73SB
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Location: Searcy, AR
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| Posted: Tue Jun 30, 2015 1:12 pm Post subject: |
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You do have only one solid fuel line running from the pump to the carb, right?
_________________
1974 Super Beetle (SunBug?) in progress. 1699 (85.5x74), Scat C25, 1.25 lifters, dual Empi ECPs. Just a little bit more than stock...
Engineering is done with numbers. Analysis without numbers is only an opinion. ~ Law #1 of Akin's Laws of Spacecraft Design |
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pgtips
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Florida73SB
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| Posted: Tue Jun 30, 2015 1:31 pm Post subject: |
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Check your rubber fuel line for leaks between the pump and the steel line going up to the tank.
I can't think of any way for fuel to get into the heat exchanger. The tube on the manifold is parallel, but not open to, the intake. Nothing should be able to get into it, and if fuel did it would be dumping it straight into the exhaust stream. You'd be shooting flames at best.
But I can't figure out how it's getting to the right side exhaust clamps if it's not coming from on top of the engine...
_________________
1974 Super Beetle (SunBug?) in progress. 1699 (85.5x74), Scat C25, 1.25 lifters, dual Empi ECPs. Just a little bit more than stock...
Engineering is done with numbers. Analysis without numbers is only an opinion. ~ Law #1 of Akin's Laws of Spacecraft Design |
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mark tucker
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Location: SHALIMAR ,FLORIDA
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| Posted: Tue Jun 30, 2015 1:35 pm Post subject: |
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| change the filters,add a filter befor the carb, rebuild the carb. if you cant fix the car find somebody that can. |
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fivelugshortaxle
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| Posted: Tue Jun 30, 2015 1:36 pm Post subject: |
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What changed? The carburetor. My guess would be that your problem is there.
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pgtips
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ps2375
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| Posted: Tue Jun 30, 2015 1:45 pm Post subject: |
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| Pull the dipstick, does it show oil or gasoline thinned oil? If you have that much fuel coming out the exhaust, the oil must be mostly gas by now. Deff something wrong at carb(s) to cause this. Pull the plugs and post a pic of them, I bet they are so gasoline fowled they quit sparking long ago. |
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pgtips
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FreeBug
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| Posted: Tue Jun 30, 2015 2:17 pm Post subject: |
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When you get back to it, take the carb off the manifold, and see where it's dripping, it's got to be coming from someplace. When you write disc, do you mean the throttle plate? Yeah, that needs to be the right way around.
Check everything along the fuel line, especially the pressure side, seeing the amount of fuel. When you rebuilt the carb, did you grind down all the surfaces flat, say on a sheet of fine sandpaper on a sheet of glass? Carb surfaces sometimes get so warped you can get a spray of fuel every time you use the accelerator pump, not down the carb throat, but straight out over the engine! Make sure your check-balls are all in place, etc..
And if you get the time, when your fuel problem is sorted, re-assemble your exhaust joints with exhaust sealing compound; if they leak liquids, they'll leak gasses, too. |
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pgtips
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jason
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| Posted: Tue Jun 30, 2015 7:54 pm Post subject: |
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| You said you replaced the fuel pump, did you set the fuel pressure? I just had the same problem with duals. It was initial startup and I hadn't set the pressure yet. It was pumping the gas in past the needle. Start it and take top of carb off to see level. You can also block the fuel line and start it with the fuel in the bowl. If it doesn't leak, there's your problem. |
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