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Tools and Field Equipment > Breaking fuel pumps

n808
Veteran
Location: Seattle, WA - USA

My first manual pump (Du-Bro) seized after a few gallons, and it never came together right. My second manual pump (Hobbico) seizes every few gallons, but I can get it going again by taking it apart and cleaning.

So then I got a Sullivan Streamer, electric pump. Very convenient, but it broke after only two tanks. The motor is running, it just doesn't pump. And the mechanism appears to be sealed, so I can not fix it.

Any suggestions for reliable fuel pumps?

Karl.

11-17-2007 06:48 PM

HOMEPAGE

z11355
rrMaster
Location: 10000 is enough time wasted.

sullivan will repair it for you.

make sure you do not have too much backpressure (ie. filters between
the fuel tank and the pump). they dont like lots of pressure

11-17-2007 06:56 PM

HOMEPAGE

turboomni
Elite Veteran
Location: 63 Rambler Down By The Dumpster

I use the six shooter manual pump and have for years. It is rebuildable as the only part to wear out is a silicon tube.

Setup is everything, All my heli's can fly better than I can pilot them

11-17-2007 06:56 PM

tnbulldog
Senior Heliman
Location: Cookeville, TN

K&S do a nice CNC one.

http://www.advantagehobby.com/?cat=...ufacturerid=137

11-17-2007 07:00 PM

spog
Senior Heliman
Location: Ontario, Canada

The six shooter is probably the most reliable pump available, but it does have some flaws.
You gotta crank a lot to fill a tank due to the low flow rate, and the cranking is a bit of a workout.

11-17-2007 07:27 PM

turboomni
Elite Veteran
Location: 63 Rambler Down By The Dumpster

Quote
The six shooter is probably the most reliable pump available, but it does have some flaws. You gotta crank a lot to fill a tank due to the low flow rate, and the cranking is a bit of a workout.

I find with the six shooter that the harder/faster you crank the less it pumps because the silicon tube doesn't have time to return to it's open normal state after being squished by the roller. Pumping slower will fill the tank faster I have found as the tube has more time to expand and fill.

Setup is everything, All my heli's can fly better than I can pilot them

11-17-2007 08:00 PM

pgrbff
Senior Heliman
Location: Louth, Ireland

I have 2 Slimline M4 manual pumps and they dont seem to have any problems.

http://www.slimlineproducts.com/online_shop/m4_pump.htm

Proficient at turning cash and credit into noise!

11-17-2007 08:08 PM

n808
Veteran
Location: Seattle, WA - USA

Thanks for the advice.

I have no filters between pump and tank, but my clunk is a fuel magnet, so its foam will create some back pressure. I have one filter between jug and pump. Defueling might be a little tough for the electric pump, through the fuel magnet, I am not sure.

11-17-2007 09:07 PM

HOMEPAGE

2LTime
Veteran
Location: Walworth,NY

Couple of us got these, http://www3.towerhobbies.com/cgi-bi...&P=SM&I=LXFH66, They pump a little slower than others but they don't leak or sieze and are rebuildable. Same basic idea (parastolic) as six shooter, but electric.

Jeff

If you can't learn to do it well, learn to enjoy doing it badly.

11-17-2007 11:09 PM

Sam2b
Key Veteran
Location: Seattle, WA - USA

Quote
My first manual pump (Du-Bro) seized after a few gallons

I have the exact pump, and also had the exact problem. But I've fixed it myself by slightly loosening a hidden set screw.

The metal Du-Bro label adhered on the side can be pried off. Then you'll expose a small hole. Use a appropriate hex driver or allen wrench to loosen (counter-clockwise) 1/2 turn.

Try to crank over the pump. If it still won't budge, loosen another 1/2 turn. When it finally cranks over, tighten back to original position. If the pump ever binds up again, do the process again. I've only had to perform this process three times, and it has never again bound up since.

Lastly, before storing the pump away after a day's flying, reverse-crank the pump to remove most fuel from within. Good luck.

_Sam B_

01-06-2008 06:01 AM

HOMEPAGE

pgrbff
Senior Heliman
Location: Louth, Ireland

This applies to the slimline pump too

Proficient at turning cash and credit into noise!

01-06-2008 09:35 AM

arrio
Senior Heliman
Location: Newport News, VA

The Hobico pump as well can be adjusted. As Sam2b said. There is usually an access hole covered by the sticker, for a small hex set screw. This set screw ajusts the clearance in the pump impeller. Or you can just take the pump apart, its quit easy, and see haow things are arranged in there. I just backed it off untill it started to turn again, and then left it a little looser, about a 1/8-1/4 turn than the original setting. Putting it back to the tighter original setting caused it to lock up again. No perceptable reduction in pump flow performance in doing this.

"fly it like you hate it"
Alfred (arrio) Riopel "more toys than time"

01-06-2008 12:34 PM

HOMEPAGE

n808
Veteran
Location: Seattle, WA - USA

I got the Sullivan Streamer back from repair. They had replaced the motor. It works great now. I don't trust it to last yet, so I have the Dubro manual as a backup, which I am pretty sure I can get it to work in any condition, considering its simplicity. I should have a 3rd backup though, just in case

Karl.

01-06-2008 04:22 PM

HOMEPAGE

MJWS
Key Veteran
Location: Airdrie, AB - Canada

One of the fuel 'bulbs' or large fueling syringes is always in my flightbox as a backup as well. Some of the cheap electrics seem to go years others run a few gallons.

Only buy once buy right I've heard of is the slimline boxxer. They never seem to fail, but are priced accordingly.

Mike

01-06-2008 05:58 PM

2LTime
Veteran
Location: Walworth,NY

Quote
I should have a 3rd backup though, just in case

You do!! I have put the gallon jug on the table and the heli on the ground. Hook the fuel tube up to heli and blow a little in the vent of the gallon jug to get it going. (siphon) Should be full in 10-20 minutes. If you're real enthusiastic you can keep blowing to speed things up.

Jeff

If you can't learn to do it well, learn to enjoy doing it badly.

01-06-2008 07:29 PM

J murf
Senior Heliman
Location: Wexford Ireland

thats the best, 2LTime .let gravity fill your heli and get something back for it causing us to crash

01-06-2008 11:49 PM

2LTime
Veteran
Location: Walworth,NY

never thought of it that way, that's pretty funny.

If you can't learn to do it well, learn to enjoy doing it badly.

01-07-2008 02:29 AM

Invrted1
Veteran
Location: Cincinnati, Ohio

Quote
If you're real enthusiastic you can keep blowing to speed things up.

I really like my heli's, but....

Guess I must be lucky, 16+ years on my electric pump and it still works!

01-07-2008 04:13 AM

Busher
Veteran
Location: Manchester, England

Slimline M4 is very good, and cheap. The six shooter is the mos reliable pump I have used, but as said you have to pump slowly to get the max from it.

Good luck
Busher

01-07-2008 09:20 AM

blvdbuzzard
Senior Heliman
Location: Southern Calif.

I still have my original Slim Line 12v pump. That is way back around 77 or 78. I have replaced the "O" ring on the drive shaft twice. It has been going for that long. It was my first field support item I ever had.

I now use Magnum hand crank fuel pumps. I have one for 30%, 15%, 10% and smoke fuel. I found the $10.00 pumps work fine. I have had 1 for over 5 years now. It has gone through more gallons then I can remember.

Dru.

01-09-2008 04:14 AM

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