electric pump

tew45

For you all that would like to try an electric fuel pump there is one from china on ebay for $15.00 freight paid. 1 to 5 psi. Also a vacuum operated pump for $7.25 freight paid. Up to 2 weeks delivery so don't be in a hurry.

BGW

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backyard

Thanks for the heads up.

johnny reb

mine all seem to run fine without one. do they give more power/ speed

Spicyunicorn

I wouldn't recommend electric on two strokes your vacuum pumps stop pumping when crank seals go out witch is good because that causes lean condition where as electric keeps pumping fuel and will eventually seize up the motor... This is first hand knowledge lol

Lochlin

Yeah, I think you are actually describing a failure of the oil injection system that is also vaccum based. Hear me out:

If you are mixing oil and gas, an electric pump should actually protect against engine damage in the event of failing seals. If the engine is running lean then it's running lean on lubrication as well as gas. An electric pump assures that this can't happen, though, as there is always plenty of lubrication as there is guranteed gas.

However, you make a good point if someone is relying on the oil injection system (which no one should be doing at this point because they are notoriously unreliable). If the seals are going bad then the oil injector, which is vacuum based, wouldn't be putting out enough lube. As the electric pump wouldn't be affected by the bad seals it would continue operating as normal with the result being an engine getting plenty of fuel but not enough lubrication. Indeed, that could be catastrophic.

To be honest, a ton of things go can wrong with those vacuum based oilers (air leaks, gasket fails, etc.) which is why most people disconnect them and just mix oil and gas to be certain that the engine is always getting oil. In these instances the electric pumps should be fine.

Lochlin

I think that if your vacuum pump is working well there isn't much difference. I prefer the electric because, if the pump is working, I know that my fuel delivery is consistent. If the seals aren't perfect, if the gas lines aren't perfect, if the vacuum pump isn't perfect, check valve, etc., it doesn't matter. I know I am getting a good flow of fuel to the carb.

It's my experience that the vacuum systems slowly degrade over time. As it's slow you really don't notice it. The electrics don't.

I don't think it's a "better or worse" thing. It's just preference.

top-cat

I had a electric pump blow out my needle valve. Siphoned fuel past it into the crank case with a full tank a gas. Quit at 1/2 tank. if you go this route make sure its LOW psi. In my opinion just rebuild the motor and enjoy it like its supposed to be, not rigged up.

rayjayy

The fuel pump makes no difference to the mixture. The mixture is controlled by the jets in the carb. When a motor starts air leaking it is drawing air in from places other than the carb throat. This additional air has no lube or fuel in it [ unless you are talking about a motorcycle motor with a bad crank seal on the clutch side at which time you will be having oil spew out the pipe ]. This extra air causes the motor to run very lean and seize up.

tew45

This is just a thought but, using an electric pump on a Tillotson carb, is it possible for the valves in the Tillotson pump to fail and allow fuel to pass into the crankcase through the vacuum passage? If so I might gasket over the vacuum passage to prevent that possibility.

backyard

Looking at a Tillotsons exploded view, it appears to me that is possible.

The needle holding back the fuel pressure is after the fuel pump diaphragm and if the diaphragm was to rupture, then fuel will leak past the diaphragm into the vacuum hole. If the vacuum line is still hooked to the crankcase, then it would allow quite a bit of gas to get into the crankcase via vacuum and fuel pressure.