Accelerator pump
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- Cadet
- Posts: 71
- Registered for: 7 years 4 months
- Car Make: VW
- Car Model: 2013 Polo Vivo 1.4 CLP
- Location: Midrand
Accelerator pump
Hi. Can the car run without one? Each time you press accelerator it sprays fuel in the car carb. Disconnect it to save some fuel?
Current : 1995 Citi Golf 1.6 carb
- Belix
- Lieutenant-Colonel
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Re: Accelerator pump
What do you mean by accelerator pump?
I'm no mechanic, but from what little I know, the accelerator on a carb car controls a valve which allows more or less air into the carb. More accelerator, valve more open, more air. More air sucks in more fuel.
Pressing accelerator also rotates the distributor slightly advancing the timing a tiny amount. The two together speed up the engine.
Without speeding up the engine, how would you drive around?
I'm no mechanic, but from what little I know, the accelerator on a carb car controls a valve which allows more or less air into the carb. More accelerator, valve more open, more air. More air sucks in more fuel.
Pressing accelerator also rotates the distributor slightly advancing the timing a tiny amount. The two together speed up the engine.
Without speeding up the engine, how would you drive around?
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Ex Jetta CLX: Red 1990 Jetta 2 GLX 3 SPD Auto
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- Cadet
- Posts: 167
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- Location: JHB , Sandton
Re: Accelerator pump
Leave it as is. The accelerator pump as such, assists with initial starts by squirting fuel into the carb. Without this, it will be very annoying to start the car.
Also assists in conditions where you need to pick up speed rapidly eg overtaking on the highway. If disconnected, your car will bog down or be more laboured in these conditions
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- Cadet
- Posts: 167
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- Location: JHB , Sandton
Re: Accelerator pump
@ Belix, he's referring to an actual pump in the carb that's referred to as an accelerator pump..... it just supplies a squirt of fuel into the primary chamber when the accerator pedal is pressed
- Belix
- Lieutenant-Colonel
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Re: Accelerator pump
Good to know, thanks!
Ride thread: White Passat B8 2.0TSi
Ex Jetta CLX: Red 1990 Jetta 2 GLX 3 SPD Auto
Ex GTi: Reflex Silver 2010 MK6 Gti
Ex Jetta CLX: Red 1990 Jetta 2 GLX 3 SPD Auto
Ex GTi: Reflex Silver 2010 MK6 Gti
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- Cadet
- Posts: 74
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- Location: Gauteng, Centurion
Re: Accelerator pump
Lol this is funny. Yes it will work without one. But it will have a serious flat spot every time you press the accelerator.
- BIGMIG
- Porra Love
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Re: Accelerator pump
I thought this was a joke. Learn something new from something old all the time I suppose.
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- Lieutenant
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Re: Accelerator pump
The stroke of the accelerator pump (i.e. the injection quantity) can be adjusted, and is actually a part of the carburetor set-up. On the old Solex/Pierburg carburetors, I think there was a spring-loaded adjustment screw on the lever. On the Keihin ones, the lever can be bent to contact its stop tab earlier or later. Just have a look at the pump mechanism when you operate the throttle.
So if it's economy you're after, you can reduce the stroke of the accelerator pump until you find that you get a flat spot or spluttering. Then give it just enough stroke so that the engine remains driveable. But how much fuel you'll actually save, I can't say.
So if it's economy you're after, you can reduce the stroke of the accelerator pump until you find that you get a flat spot or spluttering. Then give it just enough stroke so that the engine remains driveable. But how much fuel you'll actually save, I can't say.
Mark R.
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2004 VW Golf TDI, type 1J, AHF, 317k (2016-current) --- daily
1990 VW Fox, type 16, HM, 304k (2005-current) --- spare runaround
Previous:
1992 Audi 500 SE, type C4, AAR (2001-2020) --- nice while it lasted
1983 VW Golf GTS, type 17, FR (1992-2005) --- most fun car I've ever had
1978 Audi 100 GLS 5E, type 43, WC (1991-92) --- died in the side of a Rekord who cut me off
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2004 VW Golf TDI, type 1J, AHF, 317k (2016-current) --- daily
1990 VW Fox, type 16, HM, 304k (2005-current) --- spare runaround
Previous:
1992 Audi 500 SE, type C4, AAR (2001-2020) --- nice while it lasted
1983 VW Golf GTS, type 17, FR (1992-2005) --- most fun car I've ever had
1978 Audi 100 GLS 5E, type 43, WC (1991-92) --- died in the side of a Rekord who cut me off
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