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870 gas fuel pump pressure question


 
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gmccool
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Joined: 07 Dec 2009
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PostPosted: Fri Jun 11, 2021 6:28 pm    Post subject: 870 gas fuel pump pressure question Reply to specific post Reply with quote

My 870 GAS seems like it is starving for gas at full throttle. My Service manual & my I&T manual don't tell me how much pressure the fuel pump should have. I'm not one to just throw parts at something & see if it works. Does anyone know how much pressure it should have. Or does anyone know of a manual that I could buy that would tell me. Thanks Gerald
 
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wore out
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PostPosted: Fri Jun 11, 2021 9:32 pm    Post subject: Re: 870 gas fuel pump pressure question Reply to specific post Reply with quote

CVPost-gmccool wrote:
(quoted from post at 19:28:44 06/11/21) My 870 GAS seems like it is starving for gas at full throttle. My Service manual & my I&T manual don't tell me how much pressure the fuel pump should have. I'm not one to just throw parts at something & see if it works. Does anyone know how much pressure it should have. Or does anyone know of a manual that I could buy that would tell me. Thanks Gerald


"T" into the line ahead of the carburetor and watch the fuel pressure under full load. I don't have an "official spec." for your tractor but would expect to "see" in the 6-9 psi range as that is typical for a wide range of engines/tractors/carbureted vehicles, etc. etc..



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1370rod
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PostPosted: Sat Jun 12, 2021 4:24 am    Post subject: Re: 870 gas fuel pump pressure question Reply to specific post Reply with quote

I can not help with the fuel pressure question but I would suggest checking to make sure you have a nice stream of gas running out the fuel line supplying the pump. Because of the elevation of the tank in relation to the carb I would think the tractor should run fine with a full fuel tank and no fuel pump. Just my thoughts, Rod.
 
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mEl
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PostPosted: Sat Jun 12, 2021 4:41 am    Post subject: Re: 870 gas fuel pump pressure question Reply to specific post Reply with quote

Recently I struggled with an 770 gasser for fuel starvation, eventually I found the fitting where the gas line from the tank connects to the fuel pump blocked with debris, this tractor would run fine until put under a loaded condition. Just something else to consider.
 
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VAC400
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PostPosted: Sat Jun 12, 2021 3:28 pm    Post subject: Re: 870 gas fuel pump pressure question Reply to specific post Reply with quote

Gm, I looked also in my service manual it gives the carb and talks about electric solenoid. I now this is off the wall but did you check the cap vent, I have had two of them go bad.
 
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