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Old 02-22-2010, 10:16 AM   #1
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Onan fuel pump - Feetwind, Southwind

i have a 1985 fleetwind southwind-4000 w. onan i have a full thak of gas the fuel pump has 12 volts there is gas to the inlet question is pump has very little volume (output) i disconnected at the fuel pump is pumping small amount i reconnected line at pump disconnected at carb it will take 2 or 3 minutes to get gas to the carb also i replaces the line to the tank.
is this normal once gas gets up to the carb it runs fine
dave
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Old 02-22-2010, 10:53 AM   #2
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Workhorse Chassis Owner
Join Date: Dec 2006
Location: La Quinta California
Posts: 523
Quote:
Originally Posted by whem2fish View Post
i have a 1985 fleetwind southwind-4000 w. onan i have a full thak of gas the fuel pump has 12 volts there is gas to the inlet question is pump has very little volume (output) i disconnected at the fuel pump is pumping small amount i reconnected line at pump disconnected at carb it will take 2 or 3 minutes to get gas to the carb also i replaces the line to the tank.
is this normal once gas gets up to the carb it runs fine
dave
Either the "pump" is weak or you have pin hole leaks in the fuel line but as I read it you have already replace the fuel line correct?

You can purchase those small pumps at many parts houses but keep the pressure low (under 2 PSI).

Jim
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Old 02-22-2010, 11:38 AM   #3
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jim you are a great friend from what i can tell there is a diaphram in there.
yes fuel line to tank is new. those pumps run $200-$300 i can not believe that a kit is around @50 there is a onan dealer not far from me i need to get the serial # just trying to get ready for spring break (me and daughter) sown south
thanks jim this will be the first real test with the distributor mods. ill be pulling a 4 door chevy truck
dave
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Old 02-22-2010, 12:46 PM   #4
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Workhorse Chassis Owner
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Originally Posted by whem2fish View Post
jim you are a great friend from what i can tell there is a diaphram in there.
yes fuel line to tank is new. those pumps run $200-$300 i can not believe that a kit is around @50 there is a onan dealer not far from me i need to get the serial # just trying to get ready for spring break (me and daughter) sown south
thanks jim this will be the first real test with the distributor mods. ill be pulling a 4 door chevy truck
dave
Onan prices are nuts for a a small fuel pump, I've purchased 2 low pressure with decent volume pumps from Autozone with a price range of $45.00 to $65.00 and both work well under test.....

The $45.00 is connected to the main fuel line for priming the carb and works well, Had a Carter street/strip electric pump which could NOT draw/allow e'nuf fuel (off position) while climbing hills and would cause the engine to stumble and when turned on it would work fine.

With that cheaper Autozone electric pump installed all is well with the engine.

I believe you will be happy with the distributer mods, With the vacuum advance disconnected I hope you can reach 30-32 mechanical advance at 3,000 RPM and remember to limit the vacuum advance to 10 or even 12......Your going to notice a cooler running engine to boot...

Jim
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Old 02-22-2010, 01:36 PM   #5
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your the man im going to do my research when i get off today we will travel 1500 to 2000 mi in 9 days
dave
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