electric fuel pump for Predator 212 clone

[zogthegreat]

Hi everyone!

So, I was working on an electric mini chopper project:

http://www.diygokarts.com/vb/showthread.php?t=38029

and I was forced to cancel the "electric" part, $200 - $250 for batteries that will give me a max run of about 9 miles is a no-go!

I was going to sell off the frame and move onto something else when it occurred to me that my Powerhouse 3000w, (Chinese clone of a Honda GX200), is sitting unused with 2.5 hours on the clock. I've been adapting it for use in my motorhome with a vacuum pump, but if I'm going to be switching back and forth between the chopper when the coach is parked and the the coach when I'm traveling, a simpler solution would be an electric fuel pump. This way I don't have to mess around with the valve covers for a vacuum.

Can any recommend a decent electric fuel pump that would work on this motor?

Thanks!

zog

 

[Kartorbust]

All you need for a vacuum pump is a small hole in the valve cover with a barbed fitting and a hose. Wouldn't be terribly hard to pull the hose off one and put the new hose on the other. Far as I know, no one runs an electric fuel pump on these engines, just vacuum pumps, gravity feed, and Tillotson has a mechanical pump on their carburetors.

 

[Tpdingo]

You could use a complicated system using the quantum super postiton caused by the flywheel to cause a flix capacitance in the higgs field transporting the fuel from the gas tank to the carb.

Or you could go on eBay abd buy a cheap pump.

 

[Kartorbust]

Anyone know what the fuel pressure is on these engines? I know on car and truck engines with carbs if someone did an electronic fuel pump they would have to regulate it down to about 7psi.

 

[NewbCarter]

As far as i know , these small engine carbs dont tolerate any pressure before flooding unless you do mods to the needle seat .

So , fuel tank -> fuel pump -> T fitting -> one connection to the carb -> other part of the T functions as a return back to the tank .

 

[KingCobra]

I've heard that these engines can't take the pressures of a fuel pump of much more than MAYBE 1/4 psi if that. I will not waste my time with an electric fuel pump. I have a dislike for diaphragm vacuum pumps because all the more to trap tank garbage and confuse you as to why the engine won't run because of debris or a loose vacuum line cause the line shrunk or cracked or the diaphragm dry or wet rotted. I prefer gravity fed especially with my CMB RIGID chopper having the tank above the engine. I love my new chrome Harley petcock But I digress, different fuel feed procedures for different tank set-ups........ We all understand.....

 

[zogthegreat]

All you need for a vacuum pump is a small hole in the valve cover with a barbed fitting and a hose. Wouldn't be terribly hard to pull the hose off one and put the new hose on the other. Far as I know, no one runs an electric fuel pump on these engines, just vacuum pumps, gravity feed, and Tillotson has a mechanical pump on their carburetors.

Thanks Kartorbust,

I had already set up a "T" in the vacuum line to run a vacuum pump. It's just being able "plug and play" would have been more convenient. Although I might be able to mount the vacuum pump on the motor once I get my design sorted out.

You could use a complicated system using the quantum super postiton caused by the flywheel to cause a flix capacitance in the higgs field transporting the fuel from the gas tank to the carb.

You mean I can get my 6,5 hp motor up to 88 mph?!?!

Or you could go on eBay abd buy a cheap pump.

I would prefer a Mr. Fusion. Of course, if I had a Mr. Fusion, I could run my electric motor!

I've heard that these engines can't take the pressures of a fuel pump of any psi. I have a dislike for diaphragm vacuum pumps because all the more to trap tank garbage and confuse you as to why the engine won't run because of debris or a loose vacuum line cause the line shrunk or cracked or the diaphragm dry or wet rotted. I prefer gravity fed especially with my CMB RIGID chopper having the tank above the engine. I love my new chrome Harley petcock But I digress, different fuel feed procedures for different tank set-ups........ We all understand.....

I would love to run a gravity fed pump, but when in "generator mode" the motor is in one of the side bays of my motorhome. Even though I have really good ventilation in the bay, the thought of a gas tank above the genny in a closed bay make me real nervous!

Thanks for the help and advice everyone!

zog

 

[mckutzy]

How would the genny run in a typical situation????....

I thought they were a vented cabin, with air/exhaust ports.... the geny slides in and out as needed.... and carries its own fuel????

 

[Kartorbust]

I thought generators except for a few with the exhaust vented outside in a confined space would be sitting outside the motor home? I haven't been up close with a more modern RV, just older ones where the genny sits 30 feet away outside or it's plugged into a campsite power pole.

 

[Whitetrashrocker]

Aren't most built in gennies fuel fed from the main RV tank. Diesel RVs have diesel gennies. And so on.

 

[zogthegreat]

Usually motor homes have a factory installed Onan 3000 generator in one of the bays, unless you have a diesel engine, they are in the front. The geney's on a diesel are diesel generators, on gas models, well they are gas. The diesel ones do slide out, but the gas ones are permanently mounted in the bay. When I bought my motorhome, it didn't have the factory generator, ( I bought it used). When I told the dealer that didn't want it because it didn't have a generator, he threw in the Powerhouse to make me happy,(ish):

http://www.powerhouse-products.com/powerhouse_product/ph3100ri/

I've since been adapting it to fit in the original generator bay. I stripped off the outer casing and then I set up a cooling system, otherwise the bay would get to hot and fry the generator or burn down my house, (this is my third year living full time in it)! For the exhaust, I made a custom exhaust that run out to the back of the coach instead of the side. When I'm parked, I have a "snorkel pipe" that I attach to the exhaust pipe and up above the roof so that CO2 doesn't get inside. I used the original gas line from the factory generator and added a vacuum pump by cutting the vacuum line and installing a "T" adapter. It works, but I was thinking that an electric pump would be easier to deal with when pulling it out and mounting it on the chopper, (after stripping off the generator bits).

I still haven't pulled it apart to to see if the shaft will be able to hold a sprocket, I know some of the Chinese clones have a hot pressed tapered magneto or are threaded. I'm hoping to get some time this week to pull it apart.

I'm still in the planning stages here, so I trying to figure out which way I'm going with this. I'm really hoping this plan will work, because convincing my girlfriend/wife, (we've been together for 24 years, just never bothered with the marriage thing), that I need to drop $100.00 for my new project is a conversation that I'm trying to avoid! Experience has taught her that it's NEVER just $100.00 on my projects!

---------- Post added at 10:03 PM ---------- Previous post was at 09:13 PM ----------

Hmm, I found this:

https://www.ebay.com/itm/Electric-F...SA-/252757630828?_trksid=p2385738.m2548.l4275

At $10.00, I might give it a try later. I'll want gravity fed on the chopper, but on the RV it might work.

 

[bob58o]

Anyone know what the fuel pressure is on these engines? I know on car and truck engines with carbs if someone did an electronic fuel pump they would have to regulate it down to about 7psi.

I found this on another forum. So it must be true...


Default Re: Gravity Feed Fuel System... PSI

A general rule of thumb is that for each foot of elevation (height) between your tank and your carburetor will produce .5 psi of fuel pressure.

Hope this helps


Dave Prat

---------- Post added at 12:39 AM ---------- Previous post was at 12:28 AM ----------

Another I found...

Re: Can electric fuel pump replace gravity fed carb?

I installed a 6.5 kw Honda on my coach a few years ago.It had a gravity tank and I had to change it to a electric fuel pump system.I got a pump that you could take apart and I kept cutting rings off of the spring until I had about a quarter pound pressure.Otherwise it would flood as needle valve & float couldn't handle the psi of the pump.That was about 15 years ago and it still works fine.Can't remember make of pump but will try to find out for you.

Cooter

So It seems like 0.25 psi is about correct for gravity fed carbs.

 

[KingCobra]

I'll keep looking but here's one that is adjustible from 1 psi to 4 psi. NOW, question is>> The longer the run, the weaker the pressure.... sooooo, if this gentleman runs a line of say 10 feet, couldn't it be possible to get 1/4 psi out of it by the time it reached the carb?? Maybe a longer distance?? Maybe coil 20 or 30 feet of 1/4" or 3/8" fuel line?? AND the smaller the fuel line, the less pressure that can be produced. I bet you could squeeze less PSI out of this if one was careful in their adjustments. There are gauges for testing this and I'm sure a 'shop' would do it for minimal $$. Just a thought.

https://www.speedwaymotors.com/Holley-12-804-Adjustable-Fuel-Pressure-Regulator-1-4-PSI,383.html