fuel spitting out the top of carb????

[2_Late_I_Won]

Hey I was needing your help. I'm restoring a '71 opel gt for my brother. and it is misting fuel out of the top of the carb. What do you think is going on. It did this with the solex carb and now with the new weber carb. When my brother bought this it was doing the same thing.

Any help would be greatly appreciated. Thanks in advance

[RallyBob]

Cam timing and/or ignition timing are probably off.

[2_Late_I_Won]

Can you think of anything else it could be? As it was idling I had a friend turn the distributer and it never got better. As far as spewing gas from the top of the carb goes. Could there be a vital vacuum hose disconnected that would cause that?


Thanks

[RallyBob]

Have you checked the cam timing though? If the previous owner messed with the cam timing and it never ran right, it could be the reason he sold the car. Not too uncommon.

[2_Late_I_Won]

excuse me for my ignorance but are you talking about pulling the timing cover and making sure the little dot's on the cam shaft and crank shaft are lined up?

If that's what your talking about that would make a lot of since. And no I haven't checked that yet.

[2_Late_I_Won]

Is that what your talking about?

[RallyBob]

Originally Posted by 2_Late_I_Won excuse me for my ignorance but are you talking about pulling the timing cover and making sure the little dot's on the cam shaft and crank shaft are lined up? If that's what your talking about that would make a lot of since. And no I haven't checked that yet.

No need to pull the timing cover off...an admittedly difficult procedure when done to an engine installed in the car already.

You merely need to remove the valve cover to inspect cam timing. About 10-15 minutes worth of work.

[booeman]

I'm glad someone brought this up. quick run down - recently picked up 2 GT's, one for parts and one with a rebuild done about 7 years ago, he never could get it running though. first thing I noticed the rotor was eating distributor caps. no spacer for the fuel pump so in goes the correct spacer and a rebuilt distributor. next comes a screwdriver in the #1 plug hole and intake valve closes and here comes TDC. turn it over and it blows out the carb. I think the cam is off and the intake is closing late. the question is, could I back off the valve ajusters, pull the cam gear and rotate the cam somehow to get it back in line? I REALLY don't want to pull the motor if I don't have to.

[2_Late_I_Won]

Originally Posted by RallyBob No need to pull the timing cover off...an admittedly difficult procedure when done to an engine installed in the car already. You merely need to remove the valve cover to inspect cam timing. About 10-15 minutes worth of work.

Can you explain how I check for that? Is it by taking the cover off and finding the TDC of piston 1 of the compression stroke and then watch when the intake valve opens?

Thanks for all your help

[jvandyke]

Lot of threads on it. I like this one.

I just did this, just changed mine. Not hard really. Hard to see the little dimple on the edge of the cam sprocket. Can also go by the cam dowel, it should be straight up (relative to engine -GTs slant).

You need to set at TDC #4 (use the timing marks). Then see if the sprocket dowel is at 12 o'clock and the guide mark (close edge, near chain) is at about 7 o'clock (there's an indent in the metal shelf under the sprocket where this mark should be) but it's really tough to get a bead on that thing while looking down through the top, can pull the front inspection cover and see it there too.
If you're going to remove the sprocket you'll need a 8MM serrated bit (aka triple square) for the bolts on the sprocket.

[2_Late_I_Won]

So it must be off by a bit to be pushing the fuel back through the carb...but still be able to idle (sort of)....right

[GTJIM]

Basically it is almost impossible to tune a carb or fix carb problems unless the cam AND ignition timing are correct. We have no idea what condition your motor is in so the advice is always to check that these timings are correct before proceeding. The carb running lean can also cause spit-backs ... but first things first - check the timings.
Most motor problems are just a process of elimination - helped by listening to the sounds the motor makes when running ... which is a bit hard to do from 5,000 miles away!

[2_Late_I_Won]

LOL yeah I seek your advise. And I totally agree with you.

Well thanks for your time and info guys

[jvandyke]

FWIW here's a pic I took of cam alignment just tonight (double checking my recent chain hop). TDC for #4 dowel pin alignment hole in sprocket should be straight up I believe.

[2_Late_I_Won]

Thanks for the picture. You know the saying a pic. is worth a 1000 words