Gas coming out the top of the carb (too much pressure)

[2_Late_I_Won]

Hey guys I'm still have problems fixing this thing. I can't quite get the opel started *history less* ('71 opel GT, new weber carb, plugs, cap, rotor and wires. The car never ran when we bought this.)

If I hold the carb wide open it spits and sputters. After awhile of trying to start the car. Gas starts coming out from the top of the carb. I can put my hand over the butterfly's and I feel the suction. Before we changed everything the old solex carb would do the same thing.

Any suggestions?

[Jeff Pozorski]

2 things come to mind:
1) was the gas tank and lines drained and cleaned before attempting to start the car? Could be very bad gas or dirt in the tank/lines that needs to be gotten rid of.
2) Is the Weber a "new" carb or a used one? If used it may need a good cleaning itself to clear out any varnished fuel or dirt inside of it.

[2_Late_I_Won]

The Weber we bought new. The fuel should be okay. BTW before we cranked it up I ran the fuel pump to pump out some gas and I didn't see anything bad. The gas smells like it should too.

[oldopelguy]

Sounds to me like you might have a bit too much fuel pressure and it's overcoming the needle and seat and overfilling your carb. Both the solex and the weber really like about 3psi of fuel pressure, any more and they just won't work correctly.

[2_Late_I_Won]

So I should put a fuel pressure regulator on it. Thanks because I'm pretty sure it has alot more than 3psi.

[Lindsay]

Originally Posted by 2_Late_I_Won So I should put a fuel pressure regulator on it. Thanks because I'm pretty sure it has alot more than 3psi.

OEM style mechanical fuel pump or electric on car?

[2_Late_I_Won]

after market electric

[Lindsay]

Auto Parts Fast at RockAuto
CARTER Part # P60504 {In Line Fuel Pump}
Universal Electric. Pump; Fits most applications except Fuel Injection.

You might have an electric fuel pump with too much pressure or fuel injection rated (way too much pressure!). Carter P60504 is common replacement for carburetor equipped Opels. You also should have OP (oil pressure) cut-off switch installed for safety. OP6610 available from NAPA Auto parts.

Spectre Performance Prod. Fuel Pressure Regulator: Chrome (Part Number: 2517/ approx. $25) is adjustable for 1 through 5 psi.
While we find your parts, please enter your ZIP Code at PartsAmerica.com

http://www.opelgt.com/forums/fuel-pu...tor-issue.html
http://www.opelgt.com/forums/66203-post14.html

[2_Late_I_Won]

Thanks

I wasn't feeling too well last night and I didn't get a chance to ck the fuel pressure but I will try to do so tonight.

[jtb]

I had the same problem with my rotary running a modified Nikki carb, a Carter P4594 electric fuel pump, and a Holley 12-804 regulator.
I had to back the regulator waaaay off from its factory setting to stop my carb from flooding.
The gage I have is a cheapie, and it says I am now running 1psi, but it is more likely 2 or 3. Seems hard to find a good gage that is accurate at low pressures at a reasonable price.

HTH,

jtb

[Lindsay]

Originally Posted by jtb I had the same problem with my rotary running a modified Nikki carb, a Carter P4594 electric fuel pump, and a Holley 12-804 regulator. I had to back the regulator waaaay off from its factory setting to stop my carb from flooding. The gage I have is a cheapie, and it says I am now running 1psi, but it is more likely 2 or 3. Seems hard to find a good gage that is accurate at low pressures at a reasonable price. HTH, jtb

I haven't been able to locate fuel pressure gauge that reads lower than 0 through 15 psi. I looked in industrial hardware stores and internet , but could not find. Thought it would be neat to find low pressure (and not too large) fuel gauge to use on our Opels.

[namba209]

Lindsay, IDK if they are still being made or available anymore, but you might try looking for a vacuum/pressure gage, they had a full range vacuum scale 0-30 in hg and a 5-6 psi max pressure range on them. Could be a real good tool for tuning the Opels.

[Lindsay]

I always use vacuum gauge and (dwell) tachometer to tune-up the GT Weber.
Forgot that many of the vacuum gauges also indicate fuel pressure. I will need to check my garage tools one evening. Guess I could check my GT mechanical fuel pump someday for pressure.

Used precision manometer, vacuum gauge for Solex throttle adjustments prior to the Weber 32/36. Acquired gauge from calibration of vacuum columns on mainframe tape drive units during the seventies. Long time ago, I fabricated a primitive vacuum manometer using clear tubing attached to sheet of plywood, etc.

[2_Late_I_Won]

Hey guys I'm in the process of getting a fuel pressure regulator. I crimped the fuel hose and it seemed to help. I at least got it to run for a little bit. Advance auto parts had one for about $30.00 I have an account there so I can get it for about $19.99 I'm sure I'll have to put a gauge on it to find out or dial in the recommended 3-4 psi. I'm pretty confident that this will work. I only have until December 26th to get this thing road worthy. (wife gave me a dead line)