Gilmourisgod
Member
- Joined
- Jun 27, 2020
- Threads
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- 10
So.... Given a Craftsman 6.5 HP mower that was left sitting for at least a couple years. I don't know the model year, I'm guessing it's at least 10 years old. The gas had dried in the tank and carb leaving a varnished mess. Here's what I did:
1. Unpluggd Fuel hose and sprayed carb cleaner in the tank until is started draining, didn't see anything really nasty come out of the tank. Refilled with clean fuel, standard gas station 87 octane with Ethanol. Bad idea?
2. Did a carb rebuild with new float needle and seal, gaskets, and thorough cleaning, fresh gas, new air filter, new plug. Engine started second pull and ran great for about 1 hour, then wouldn't restart. Primer bulb doesn't work.
3. Looking into carb, I see primer isnt pumping gas up through the emulsion tube.
4. Tried replacing carb gasket to air cleaner housing, check primer bulb, still won't prime. Air cleaner housing looks a little warped due to overtightening bolts. Remove carb, clean again, repeat, NFG.
5. Tired of screwing around, I replace carb with Amazon special Chinesium carb, replace air cleaner housing with OEM B&S part with integral primer. Replaced cracked fuel hose. All new gaskets throughout. I used (2) carb/air cleaner gaskets thinking I might have an air leak.
6. Engine starts second pull, runs great for 5 mins, then starts surging, spitting, missing, then dies.
7. Let it cool off a while, same issue, starts, runs, then surges and eventually dies, like it's fuel starved.
8. Gas cap is missing the metal "cone" inside I see on B&S gas caps in videos, I can see the plastic pin that broke off at some point, rubber seal is still there, but no aluminum piece. NFG, engine starts right up, but starts surging after about 5 mins.
From everything I've seen online, this sounds like a fuel blockage or vapor lock, but since it's a brand new carb, brand new fuel line, etc, hard to believe its that. I did double check the bowl nut jet, some reports of metal debris on these carbs, none visible here, Confirmed that float is parallel to carb body, moves freely, gas flows when float drops.
The tank shows no sign of leakage, and I didnt see any debris in it via flashlight, but is there a filter in these plastic tanks that might have gotten clogged?
Advice appreciated, I am stumped!
1. Unpluggd Fuel hose and sprayed carb cleaner in the tank until is started draining, didn't see anything really nasty come out of the tank. Refilled with clean fuel, standard gas station 87 octane with Ethanol. Bad idea?
2. Did a carb rebuild with new float needle and seal, gaskets, and thorough cleaning, fresh gas, new air filter, new plug. Engine started second pull and ran great for about 1 hour, then wouldn't restart. Primer bulb doesn't work.
3. Looking into carb, I see primer isnt pumping gas up through the emulsion tube.
4. Tried replacing carb gasket to air cleaner housing, check primer bulb, still won't prime. Air cleaner housing looks a little warped due to overtightening bolts. Remove carb, clean again, repeat, NFG.
5. Tired of screwing around, I replace carb with Amazon special Chinesium carb, replace air cleaner housing with OEM B&S part with integral primer. Replaced cracked fuel hose. All new gaskets throughout. I used (2) carb/air cleaner gaskets thinking I might have an air leak.
6. Engine starts second pull, runs great for 5 mins, then starts surging, spitting, missing, then dies.
7. Let it cool off a while, same issue, starts, runs, then surges and eventually dies, like it's fuel starved.
8. Gas cap is missing the metal "cone" inside I see on B&S gas caps in videos, I can see the plastic pin that broke off at some point, rubber seal is still there, but no aluminum piece. NFG, engine starts right up, but starts surging after about 5 mins.
From everything I've seen online, this sounds like a fuel blockage or vapor lock, but since it's a brand new carb, brand new fuel line, etc, hard to believe its that. I did double check the bowl nut jet, some reports of metal debris on these carbs, none visible here, Confirmed that float is parallel to carb body, moves freely, gas flows when float drops.
The tank shows no sign of leakage, and I didnt see any debris in it via flashlight, but is there a filter in these plastic tanks that might have gotten clogged?
Advice appreciated, I am stumped!