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Discussion Starter · #1 ·
My SunStar keeps leaning out due to fuel starvation. I have replaced everything fuel system related except the pump. I have taken the pump apart and checked the diaphragm and it looks good but I suspect it may have a pinhole in it. I hate to spend $80 for a mechanical pump when I could get an electric for less.

Anybody have any suggestions? Would an older carbed automotive electric pump be okay?
 

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Master Service Technician
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The problem with putting an automotive style fuel pump on is the amount of pressure that it puts out. The carb inlet needle is rated at a certain psi..Most of them when I test them pop off at 5psi.. so if your electric fuel pump puts out lets say 12psi it could push fuel past the inlet seat causing you more problems...Does this all make sense???
 

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On ebay the have low pressure fuel pumps for GT (1-5lbs) Have you checked the tank to make sure your inlet is clean also have you replaced the suction line from the tank to the pump? Many times a pin hole can develop or the hose can get hard and rigid and lets some air suck by at the fittings.
 

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Discussion Starter · #4 ·
The problem with putting an automotive style fuel pump on is the amount of pressure that it puts out. The carb inlet needle is rated at a certain psi..Most of them when I test them pop off at 5psi.. so if your electric fuel pump puts out lets say 12psi it could push fuel past the inlet seat causing you more problems...Does this all make sense???
Yes, i don't want to flood the engine, that would not be good!
 

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Discussion Starter · #5 ·
On ebay the have low pressure fuel pumps for GT (1-5lbs) Have you checked the tank to make sure your inlet is clean also have you replaced the suction line from the tank to the pump? Many times a pin hole can develop or the hose can get hard and rigid and lets some air suck by at the fittings.
Yes, I have drained, cleaned the tank and replaced the pick-up screen/elbow, all of the line, and the filter. I adjusted the float to spec and the needle is in good shape.

When this lean condition happens, I can shut the engine off and then I will see bubbles coming from the pump side of the clear filter but the filter is full of fuel. Something tells me its just not pumping for some reason. Or maybe the pump is not priming.
 

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TRACTORHAULIC
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Jonboy, I will get you the part number as soon as I can for a pump at Napa autoparts that will do the trick. The pump is preset at 1.75 psi and is about $30.00. I will P.M. you with the part number as soon as I get it from a buddy.
Bill
 

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Discussion Starter · #7 ·
Jonboy, I will get you the part number as soon as I can for a pump at Napa autoparts that will do the trick. The pump is preset at 1.75 psi and is about $30.00. I will P.M. you with the part number as soon as I get it from a buddy.
Bill
Thank You! That is what I am looking for:trink39:
 

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Discussion Starter · #8 ·
I picked up a fuel pump today from NAPA. Its a 1.5-4 psi, 25gph 12 volt unit. I hope to get around to hooking it up later this weekend.
 
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