New and having problems

[Nezandy]

Hi all, my partner has a nitro truck, he has bought and changed glow plugs, exhaust, but it won't start, doesn't seem to be pumping the fuel to the carb at all, can't see any fuel going through the line, anything we can try to get it going?

 

[Mrgoodwrench35]

Welcome aboard!!

 

[Lucifur10]

Does it have a pressure line from the exhaust pipe to the tank? Is the tank filler neck/cap sealed? O-ring under cap good? Do you have any pictures of the whole system?

 

[Guest D]

Welcome to RCT.

 

[CertifiedMike]

Welcome to RCTALK.COM!!!

Have you actually blown thru the lines to be sure they aren't clogged? No physical blockage in the tank?

There is a hose that comes out of the muffler and goes to the fuel tank.
If you remove the hose from the muffler and blow into the hose, the fuel system should pressurize and sent fuel to the carb. (it primes the system)

Be sure to store your RC with no fuel in it and always use after-run oil!
Old fuel will clog up the works and cause a situation just like this one.

Good luck!!!

 

[Nezandy]

Welcome to RCTALK.COM!!!

Have you actually blown thru the lines to be sure they aren't clogged? No physical blockage in the tank?

There is a hose that comes out of the muffler and goes to the fuel tank.
If you remove the hose from the muffler and blow into the hose, the fuel system should pressurize and sent fuel to the carb. (it primes the system)

Be sure to store your RC with no fuel in it and always use after-run oil!
Old fuel will clog up the works and cause a situation just like this one.

Good luck!!!

Yes tried that still not doing anything

 

[Nezandy]

Does it have a pressure line from the exhaust pipe to the tank? Is the tank filler neck/cap sealed? O-ring under cap good? Do you have any pictures of the whole system?

Yes all checked and all fine no blockage etc

 

[Nezandy]

Yes all checked and all fine no blockage etc

Photo included

 

[ohsnap]

New truck / engine or used?

Does it have a pressure line from the exhaust pipe to the tank? Is the tank filler neck/cap sealed? O-ring under cap good?

Have you actually blown thru the lines to be sure they aren't clogged? No physical blockage in the tank?

Both are good suggestions of things to do / observe.

Did you prime / properly prime the fuel?
Put your finger over the exhaust and use the pull or roto or bump-start to turn the engine over until the fuel just gets to the carburetor inlet and then try and start it.
You do not want to over prime it.

Assuming used:
If no fuel makes its way to the carb, odds are that either the filter in the tank is clogged or the HSN inlet is clogged.
I'll put denatured alcohol into an old and nasty tank and let it soak.
That usually does the trick of freeing / cleaning up a tank.
Try priming it after this.
If it doesn't push fuel to the carb, you'll need to clean the HSN and its nozzle.

Assuming used:
The engine may also have no compression.
With the glow-plug installed, can your finger easily spin the flywheel through the compression cycle, or does it offer noticeable resistance before hitting TDC and provide a decent pop after hitting the top?
You want the pop or so much resistance that you can't even reach TDC this way.

 

[Lucifur10]

I know you said "new glow plug" but is the plug actually "glowing"? I've had bad plugs before and or low batteries in glow igniter resulting in weak glow. I'm assuming you're using a rechargeable igniter.

 

[Nezandy]

New truck / engine or used?




Both are good suggestions of things to do / observe.

Did you prime / properly prime the fuel?
Put your finger over the exhaust and use the pull or roto or bump-start to turn the engine over until the fuel just gets to the carburetor inlet and then try and start it.
You do not want to over prime it.

Assuming used:
If no fuel makes its way to the carb, odds are that either the filter in the tank is clogged or the HSN inlet is clogged.
I'll put denatured alcohol into an old and nasty tank and let it soak.
That usually does the trick of freeing / cleaning up a tank.
Try priming it after this.
If it doesn't push fuel to the carb, you'll need to clean the HSN and its nozzle.

Assuming used:
The engine may also have no compression.
With the glow-plug installed, can your finger easily spin the flywheel through the compression cycle, or does it offer noticeable resistance before hitting TDC and provide a decent pop after hitting the top?
You want the pop or so much resistance that you can't even reach TDC this way.

It's a new truck, purchased at Christmas for my partner, was running all fine, hasn't been used for a couple of weeks, after run oil put in etc after last use, just won't start or anything now, pull cord not tight, it's just not taking the fuel up.

 

[CreepyQuarryCrawler]

Batteries good in the truck and glow ignitor?

 

[WRM]

It's a new truck, purchased at Christmas for my partner, was running all fine, hasn't been used for a couple of weeks, after run oil put in etc after last use, just won't start or anything now, pull cord not tight, it's just not taking the fuel up.

Is the pull cord turning the crankshaft?...

I also thought glow-plug problems as I struggled with that recently, but if it's not drawing fuel through the line to the carb, it's a fuel/carb/engine problem. You can check plug and igniter by removing the plug and touching it to the igniter contacts - the filament should light up bright like a light-bulb.

 

[CertifiedMike]

Yes tried that still not doing anything

You blew into the line and the fuel didn't make its way to the carb?

 

[Nezandy]

You blew into the line and the fuel didn't make its way to the carb?

No it didn't

 

[CertifiedMike]

The seal on the top of your tank is leaking... thats my guess. Is it clean?
The cap needs to be closed for the fuel system to work correctly btw.
When you blew back from the carb into the tank, did you get bubbles in the fuel inside the tank?
Theres a leak somewhere.

 

[ohsnap]

Maybe it's a false perspective (I'm seeing things?), but the HSN seems to be cranked way down - like I swear that I see threads.
Could it be bottomed out and stopping flow?

I looked at several of my engines and they were flush (flushish) to a tad over a 1mm short of being flush.

New truck - Does the manual say anything about carb settings?

 

[CertifiedMike]

Maybe it's a false perspective (I'm seeing things?), but the HSN seems to be cranked way down - like I swear that I see threads.
Could it be bottomed out and stopping flow?

I looked at several of my engines and they were flush (flushish) to a tad over a 1mm short of being flush.

New truck - Does the manual say anything about carb settings?

100%!!!
Set needles back to stock settings for sure!

 

[WRM]

The screw on my OSS Main is significantly below the brass top, too. I noticed that, but since it ran when they put it up, figured it wasn't adjusted since? Gently screw the main all the way down until it stops and count the turns to see where it was. +2.5 turns is usually a good starting point. Then make sure fuel's running to the carb (could also be tank lid seal or a pin-hole in a line).