My Empi 34epc carbs flood after engine is shut off. There the same carbs I had with my old motor only I changed the jets back for the bigger motor. Rerouted fuel lines as per my mates car. Getting frustrated any ideas much appreciated thanks.
needle and seat stuck??
Futue te ipsum!!!
Checked and rechecked
Mechanical or electric fuel pump?
Mechanical
Check the fuel line pressure. More than 3.5psi and you'll have flooding issues. Residual line pressure could be causing the problem if the line pressure is high whilst engine running.
madness is in the eye of the beholder 👍
Hi Jodie
The length of the pump shaft can be incorrect, resulting with fuel pressures of around 10psi [so, I've read] or even higher..
so, I agree that its residual pressure after the engine is turned off..
You can shim the base of the pump up to the correct position to lower the fuel pressure..
Lee
- Helping keep Air Cooled VWs on the road - location: SCONE in the Upper Hunter Valley - Northern NSW 320 kms NNW of SYDNEY---
Checked all those things Lee, still no joy. I ran some ethanol blend fuel in it and seams to have loosened the fine rust inmy tank I have 2 fuel ffilters and shit still getting in carbs. I have a new fuel tank I bought at Valla but haveto put a new filler neck on it as it was bought as damaged stock. Anyway thinking of putting some twin 40 webers/empi or delortos on it.
Ill try and check fuel pressure over the weekend.
No carburettored car should ever have Ethonol blended fuel in it
Changing your carbs would be a good move IMO
Matt Berry Motorsports...air cooled advice, repairs and mods Ph 0408 704 662
OFF-ROAD,CIRCUIT,DRAG,STREET,ENDURANCE
Thanks Mat
matberry wrote:No carburettored car should ever have Ethonol blended fuel in it
Changing your carbs would be a good move IMO
Why so? Eats the aluminium or gumming issue?
madness is in the eye of the beholder 👍
My 68 Beetle doesn't go well on Ethanol fuel..
I lose a lot of power...
and it goes great once the ethanol fuel is removed and replaced with non ethanol fuel...
so I make sure I don't buy any fuel with Ethanol..
Most old servos still have NON Ethanol 91..
or 95 or 98
Most bowsers have stickers on them saying NOT to Use E10 with Ethanol in Motor Cycles or Marine engines..
should also include Air Cooled VWs..
LEE
- Helping keep Air Cooled VWs on the road - location: SCONE in the Upper Hunter Valley - Northern NSW 320 kms NNW of SYDNEY---
psimitar wrote:matberry wrote:No carburettored car should ever have Ethonol blended fuel in it
Changing your carbs would be a good move IMO
Why so? Eats the aluminium or gumming issue?
Softens the rubber O-rings, seals, etc, so they slowly perish putting a rubber mud through the carbs. Slowly attacks the aluminium castings (some are worse than others here) to create a fine silty alloy mush through the fuel system which clogs everything.
And in this case, possibly maybe perhaps, can get to the Viton tip on the fuel inlet needle, so it goes soft and won't seal against the seat properly making a slow drip into the motor.
Yes to all above, but most of all, the mixture MUST change. With carbs, fuel is metered by the jets, these only change the amount of fuel delivered by changing jets. A later EFI engine monitors the exhaust gas and changes the mixtures to compensate any differential in fuel by changing the timing of the injectors, ie. if it senses a lean condition, the computer puts in more fuel, carbs don't do this. With alcohol fuels, roughly 3 x more alcohol fuel is required to creat the proper fuel mixture. So even a blended fuel requires an increase in fuel delivery to create the proper combustion. A carby engine on alcohol without increased jetting WILL run lean, no question, and a blended fuel actually never the same amount of % of alcohol as it evaporates out of the fuel so it is imposible to tune for accurately, one day it may be right, the next not. Only EFI can monitor exhaust and regulate fuel delivery.
Matt Berry Motorsports...air cooled advice, repairs and mods Ph 0408 704 662
OFF-ROAD,CIRCUIT,DRAG,STREET,ENDURANCE
Does anyone know how to set up dual Empi EPC 34, i built a 1776cc for a mates DC, runs fine but they can't get it to Idle just dies below 1200rpm otherwise very responsive
C25 cam 7.4 C/R
stock valve 040 hemi heads
chromoly pushrods 002"
009 8* BTDC 28*total
Holley pump and reg 2psi
I will be getting the engine back on Tuesday to try and sort it out on the bench
I doubt the carbys are correct out of the box so any help is appreciated.
bitten by the bug..........several times
Throttle plate setting at idle correct for transfer slots?
Solenoids energised OK? (if they have them?)
Holley regs are bloody horrible things at less than 4 or 5psi, I'd double-check.
Just a few.
Matt n Modnrod, ta muchly for the explain. Always nice to learn something new 🙂
madness is in the eye of the beholder 👍
I replaced my fuel tank with brand new wolfsburg west one. Fitted a carter rotary electric fuel pump running just over 2 psi. My question now is if anyone is running 34ict/epc carbs what jets and emulsion tubes? My motor is 1641cc 1.25:1 rockers.
Stock mains 130
emulsion F6
idle jet 55
pump 40
cheers
joesbuell wrote:I replaced my fuel tank with brand new wolfsburg west one. Fitted a carter rotary electric fuel pump running just over 2 psi. My question now is if anyone is running 34ict/epc carbs what jets and emulsion tubes? My motor is 1641cc 1.25:1 rockers.
Stock mains 130
emulsion F6
idle jet 55
pump 40
cheers
135 for mains and I think, been 14years since I did mine, that F11 tube gets rid of the flat spot just off idle that occurs with a 009 dizzy.
madness is in the eye of the beholder 👍
