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Discussion Starter · #1 ·
'89 JD 318 P218G Onan

Carb was recently rebuilt, but I noticed this before card was rebuilt.
Electric low pressure fuel pump. OEM vacuum fuel pump deleted

If this tractor sits for a coupls' months, it will NOT start!

I have to pull everything off the top of the carb and put a couple drops of gas down it's throat, then it starts right up and will start as long as I run it every week or two.

I assume the carb is running dry?
 

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These carbs typically don't syphon dry, but let's assume yours is! When you turn key to "Run" you should hear fuel pump "click" fast and or loud. After 15 or 20 seconds it should slow down or get quieter. NOW go to start. If still no start, maybe choke isn't fully closing. As a side note, did you plug/block vacuum line for OEM pump? Bob
 

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Discussion Starter · #3 ·
These carbs typically don't syphon dry, but let's assume yours is! When you turn key to "Run" you should hear fuel pump "click" fast and or loud. After 15 or 20 seconds it should slow down or get quieter. NOW go to start. If still no start, maybe choke isn't fully closing. As a side note, did you plug/block vacuum line for OEM pump? Bob
I will check on all these things you mentioned, but I am 99% sure the answer is yes to all.
 

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Why doesn't the electric pump prime it? Does the pump run with the key on?

This was my fix to my 316, still have the mechanical fuel pump. Primer bulb works perfect.

786806
 

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It's always good to have a clear inline fuel filter upstream from your fuel pump to see if there's fuel in the line.
If the fuel pump is priming and pumping gas to the carb, there is no reason the carb shouldn't be priming. Only possibility is sometimes the fuel inlet needle can swell up (especially from junk ethanol gas) and stick in the inlet and not let fuel into the float bowl.
Have you tried taking the fuel line off the carb and into a jug and turn the key on to see if fuel is pumping?
 
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