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Old 05-27-2012, 01:26 AM
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Just plain gutless out of nowhere

My truck is an 81 chev with an 86 305 I converted back to carburated, I have to run a electric fuel pump inline. The carb is just a factory qjet from an 85 305 and all of a sudden my truck is gutless and bogs under acceleration at low rpm. it did this once before and I chalked it up to water fuel seeing as I got fuel elsewhere instead of my normal spot and I put some water remover and fuel system cleaner in it when I filled up and the issue went away, But now it's back, I did just replace all three fuel filters in my setup and just installed another new fuel pump (mine mysteriously ended itself last night in the parking lot of my work warming up) it's a universal pump for carbs flowing 7-9 psi max. I'm just beside myself on what to do, this truck has been nothing but a headache

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Old 05-27-2012, 07:26 AM
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If it is performing poor now. Check the calibration. Jets the same, accel pump, door tension, etc.

Want more. My 85 305 / th350c c10 found good balanced performance with the performer cam/intake. Topped with milled 906 vortecs, qjet, a 3.73 ring set, 100 headers, the icing on the cake was a dynamic 3000 stall. A 3000rpm grand national type stall let it charge out of the hole. Heads and cam were strong improvement from stock.

From a drag racing point of view the cam may be a little mild , but it is tough. Dependable all through winter, highway at 2800rpm / 65mph, mileage still poor at 15-16 cruise control on.

My cheapest hot rod build ever.
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Old 05-27-2012, 09:44 AM
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Quote:
Originally Posted by hauss667
My truck is an 81 chev with an 86 305 I converted back to carburated, I have to run a electric fuel pump inline. The carb is just a factory qjet from an 85 305 and all of a sudden my truck is gutless and bogs under acceleration at low rpm. it did this once before and I chalked it up to water fuel seeing as I got fuel elsewhere instead of my normal spot and I put some water remover and fuel system cleaner in it when I filled up and the issue went away, But now it's back, I did just replace all three fuel filters in my setup and just installed another new fuel pump (mine mysteriously ended itself last night in the parking lot of my work warming up) it's a universal pump for carbs flowing 7-9 psi max. I'm just beside myself on what to do, this truck has been nothing but a headache
Get a can of flammable carb spray- not the water-based crap that's no good, you want the stuff that will burn the H out of you after a minute or two of having it on your bare skin. Can will say flammable, too. Usually the cheap store brand stuff is the best, like "O'Reilly Carb and Choke Cleaner" in the black and red can, costs a buck- fiddy.

Use it per the can directions, paying attention to the small air bleeds. You should have a single main air bleed-type Q-jet, but that's not in stone; many things about Q-jets do not follow a strict set of rules. The single MAB carbs were pretty good about not plugging up the bleeds because the bleed locations were such that they weren't subject to dirt, etc. falling down on top of them, but if the filter was ever off or it's dirty, cut, etc. dirt will still plug them up. And the new gas doesn't help.

Check to be sure there's no vacuum lines off- especially to the vacuum advance. No vacuum leaks, period. Plug wires all on, not burned or laying against the headers/exhaust manifolds, etc. Dist. cap clean and tight, all the usual jazz.
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Old 05-27-2012, 10:02 AM
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Wild guess, If this is a mid 80's carb. Did you attach the bowl vent return to a PCV line? The are the same size hosing. The crankcase pressure will cause poor driveability.
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Old 05-27-2012, 10:07 AM
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I was actually going to just buy a new set of wires seeing as mine are a few years old, and I'm not familiar with these air bleeds, I'm use to fuel injection imports what exactly am I looking for

And spinn how would I know if i did?
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Old 05-27-2012, 10:12 AM
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PVC ports and power brake are below the throttle plates. The Bowl vent return is above, and on the primary side.

The bleeds are those small holes down the throat of the carb.

Rev it off idle and spray down the throat to keep from stalling.
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Old 05-27-2012, 10:15 AM
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What should be connected to the return vent?
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Old 05-27-2012, 10:17 AM
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Charcoal canister. Then canister to fuel return line.

You didnt , did you?
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Old 05-27-2012, 10:30 AM
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I'm heading to my truck now to check, I don't have a return line though, when I bought the truck the mechanical pump on the old engine only had a feed line, no return, I've looked for it and the previous owner completely removed it
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Old 05-27-2012, 10:40 AM
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I don't think I did but I took a pic of the carb but I can't figure out how to post it on here lol
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Old 05-27-2012, 11:23 AM
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Quote:
Originally Posted by hauss667
when I bought the truck the mechanical pump on the old engine only had a feed line, no return
You'll need to run a return line with either pump, but particularly with the electric pump. The mechanical pump will vary the fuel volume with engine RPM. The electric pump's volume is constant; the pump will burn up if the engine cannot use the fuel as fast as its being delivered to the carb.
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Old 05-27-2012, 11:48 AM
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Quote:
Originally Posted by Supercharged03
You'll need to run a return line with either pump, but particularly with the electric pump. The mechanical pump will vary the fuel volume with engine RPM. The electric pump's volume is constant; the pump will burn up if the engine cannot use the fuel as fast as its being delivered to the carb.
That would explain why I've gone through two in three months, where would I plumb one In?

And I just drove to work and it's like I have no secondaries, I have accelerate really slow then when it shifts it bogs horribly and I have to back off the throttle
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Old 05-27-2012, 12:54 PM
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Return line

Quote:
Originally Posted by hauss667
where would I plumb one In?
I have a tee in the supply line at the carb. One end connects to the carb and the other to the return.
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Old 05-27-2012, 01:42 PM
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Should I put that before or after the filter to the carb? or does it matter, it's about 8" before the carb thank you for the help. I can't believe I never thought of that, of I would have used common sense I could have avoided spending 120 dollars on unneeded pumps. I guess theres a price for stupidity lol
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Old 05-27-2012, 05:07 PM
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Quote:
Originally Posted by hauss667
Should I put that before or after the filter to the carb?
Mine's right at the carb, after the filter.
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