Tue Sep 18, 2012 7:49 pm
Will an 'electric fuel pump' work in place of the original 'vaccum fuel pump' that came with the 20hp Onan in my 982.
Thu Sep 20, 2012 9:25 pm
GI tractorman are you out there man?
Fri Sep 21, 2012 4:27 am
I've got no idea on this one. Never have had any problems with the original fuel pumps, so I'm not sure why you would want to change one out.
Fri Sep 21, 2012 7:48 am
She came with a JDeere vaccum pump that had one nipple broken off and and a new electric pump in the box. With the electric pump it seems to flood, smoke and run rough like it is getting too much gas. Yet the inline fuel filter is only 1/4 full of gas when she is running. Les
Fri Sep 21, 2012 8:35 am
Compare the original fuel pump to NAPA or Federated part number 7-08015. That fuel pump is used on single cylinder engines and operates off of crankcase internal pressure/piston movement. The same fuel pump is used by Briggs, Kohler and other engine manufacturers.
If that is not the correct fuel pump, take the old one in to a small engine shop or well staffed auto parts store. If they want to take the time they can visually compare the fuel pump to their paper parts books.
Ida Red wrote:The electric pump it seems to flood, smoke and run rough like it is getting too much gas.
Problem is that fuel pumps operate at different psi's. The electric fuel pump is probably over powering the Onan's carburetor float.
Fri Sep 21, 2012 7:34 pm
Thanks for the reply. Eugene my 982 has a twin cylinder 20HP Onan in it.
Fri Sep 21, 2012 8:33 pm
one nipple broken off
You may be able to disassemble the fuel pump and replace the broken nipple with a bit of metal tubing and some epoxy. Done this in the past - drilling out the old nipple with a drill bit matching the diameter of the tubing.
Tried to identify a single vacuum powered fuel pump for a 20 HP Onan. Did find a repair kit for one for $60- on E-bay. Ouch. There were quite a number of electric (DC) powered replacement fuel pumps for Onan engines.
If you want to replace the original fuel pump - take it to your favorite auto parts store or small engine shop.
Sun Sep 23, 2012 10:08 am
Test the psi of the current electric fuel pump. If you find the fuel pump has a pressure above 5 psi it's probably over powering the float and needle valve. If it's not the fuel pump, carburetor problem.
Low pressure electric fuel pumps, some as low as 1.5 psi, are available at reasonable prices.
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