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Screen in the FRC-10 Walbro

matuva

matuva

Tropical 6.5er
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Location
New Caledonia. An island in south west pacific, cl
Is it worth it keeping the screen filter which is included in the inlet of the Walbro FRC-10?

What if I take it out? Is there any risk of damaging the pump itself with the small dust, metal dust I can find in the fuel.

The IP itself is protected with it's own inlet screen, stock fuel filter and a Water/fuel separator (20 microns mesh) I added...
 
mm, I was wondering that because I have the case of a Walbro which died as it was less 2 years old, and stock lift pump usually go beyond.

That being said, the guy didn't clean the screen which ended being clogged... I don't know if this is what killed the FRC-10 ,but even hotwired, the walbro is not doing anything...
 
I am starting to wonder if they got a bad batch of electronics for the FRC-10. Several have failed for others. I doubt the plugged screen was the cause. Maybe overheated with little fuel flow?
 
I was thinking of purchasing a frc 10 to disect. Anybody willing to sell an broken one they have around?? I would like to see what happened to them.
 
greenmeanh1 said:
I was thinking of purchasing a frc 10 to disect. Anybody willing to sell an broken one they have around?? I would like to see what happened to them.
Click to expand...

The thread I posted above shows both pumps torn down and the differences. Mainly the armature is longer. You will need an epoxy stripper to get to the electronics. I have an early or first batch FRC-10 and it died due to scoring. It's pressure is low and it is noisy. A new armature and it would work again like the FRB-5.
 
So the electronics are potted in epoxy?? I didn't see a link to the teardown pics. I will look again

Edit Found the Pics.
So would you say the electronic fails are because of scoring causing high loads on the electronics??
 
My electronics are fine. The pump leaks internally and rattles from the scoring vs. one with a new armature. Pressure was low. (Water and bugs are abrasive...) The armature is a softer metal than the inner tube/liner of the pump/coil. All the pump does is sense where the armature is (The armature is a magnet that silver cylinder looking thing.) and fire the magnetic coil to compress the spring and suck fuel in. The spring then provides pressure until the armature is sensed near the end of the travel or perhaps a built in timer circuit fires. The pumps don't have any sealing rings so they will leak down internally and need to pulse with the engine off -no fuel flow. The check valve prevents any fuel from flowing back to the tank while the armature is leaking it's pressure off.

Again, low pressure/noise was fixed in the FRB-5 with a new armature. A FRB-5 Armature doesn't work well in the FRC-10 as I recall...

The end of the travel is the top of the pump BTW.

I wouldn't be surprised if the pump uses a reed switch and an amplifier. Hall effect pickup coil could also work.

The spring sucks fuel into the pump as well as pressurizing it out of the pump. The pulse just pulls the armature back under no load as the check valve in the armature would be open. It just has to compress the spring. Other than heat or low voltage/current from a bad OPS etc. I can't think of any way to cause it to fail offhand. I have tested the heat theory - but I have a very early FRC-10. possible later design or component change may be a factor.

Vs a brush equipped motor design it is stupid simple with very few failure points. It has to be a solid state failure in the electronics. Coils shorting, cracking connections, or just a bad transistor batch. Tin whiskers from lead free solder is almost ruled out due to the epoxy...
 
matuva said:
mm, I was wondering that because I have the case of a Walbro which died as it was less 2 years old, and stock lift pump usually go beyond.

That being said, the guy didn't clean the screen which ended being clogged... I don't know if this is what killed the FRC-10 ,but even hotwired, the walbro is not doing anything...
Click to expand...

Back on topic, what clogged the screen? Bugs? Do you have a pic?
 
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