PieceOfQ-JetWontStart

[Battlac40]

"Ran when I parked it syndrome":
Parked the new project in the in the carport changed the pinion yoke and some floor board work. Now the truck wont start.
Ran some new rubber from the top of the metal line to a new filter with some new hose to the Q-Jet. Sprays fuel out of the line. Also has a electric helper Mr. Gasket in the back seems fine. Tapped the POS with the soft end the screw-driver & more aggressively with a buck-shot mallet.
Leaning in, I don't see any "squirt" when I smash down on the throttle cable, looking inside the carb. If I pour some gas in the carb. & it starts until it bogs down and wont keep running. Ideas?

+Pics of how you guys ran your filters and lines with a Q-Jet; Have alot more room for a filter on the 81' w/eddlebrock but, was loving the gas-consumption on the Q-Jet.

350-4bbl-Qjet-HEi-th400-205-3/4

 

[HotRodPC]

So how long did it sit? Are you running ethanol fuel in it?

 

[Battlac40]

A Month.
Premium with a bottle of Lucas all gas around here has "10%" ethanol; Commies.

Bought it in Southern Colorado drove it to Northern New Mexico and caput.

Started kinda rough the next day then a month later nothin.
New upper line, filter(arrow facing correctly), cleaned out the hard line from the pump.

 

[HotRodPC]

So it won't even start, then idle like hell then shut off. And it won't keep running after you primie it. Have you cracked the fuel line at the inlet or have a visible inline fuel filter where you can tell if the fuel pump is pumping fuel.? If the fuel pump is pumping fuel, then you know the carb is the problem. That ethanol is nasty **** for sitting carbs. Not sure how well the Lucas will help it. Some of those needle and seats have a rubber tip. if that rubber melted down a little from the ethanol and stuck the needle, then it's not going to let fuel into the carb bowl. That ethanol is also good for eating up the rubber on the accelerator pump. If you do end up rebuilding the carb, try to find an ethanol compatible kit since you live in an area where you can't get 100% gas.

 

[Snoots]

You can get great kits here:

https://cliffshighperformance.com/

 

[Obwonkonobe]

I'd try a rubber mallet or screwdriver near the floats, then tear the thing apart and run through the needle and seat

 

[Battlac40]

I'd try a rubber mallet or screwdriver near the floats, then tear the thing apart and run through the needle and seat

Tried that ^ noted above.

 

[Battlac40]

So it won't even start, then idle like hell then shut off. And it won't keep running after you primie it. Have you cracked the fuel line at the inlet or have a visible inline fuel filter where you can tell if the fuel pump is pumping fuel.? If the fuel pump is pumping fuel, then you know the carb is the problem. That ethanol is nasty **** for sitting carbs. Not sure how well the Lucas will help it. Some of those needle and seats have a rubber tip. if that rubber melted down a little from the ethanol and stuck the needle, then it's not going to let fuel into the carb bowl. That ethanol is also good for eating up the rubber on the accelerator pump. If you do end up rebuilding the carb, try to find an ethanol compatible kit since you live in an area where you can't get 100% gas.

Exactly, just making sure that I am not crazy. Good info on the needle and accelerator pump. Been leaning toward the later; this strengthens my suspicion. Gonna take it in to a shop for a rehaul.

 

[1987 GMC Jimmy]

Unless you know an old timer who’s good with that sort of thing, I’d send it in the mail somewhere (i.e. Mountain Man Carb and Fuel or Quadrajet Power). My dad took two Q-Jets to a local guy, and he totally botched both of them. It sounds like a case of the sat too long.

 

[436'd skylark]

Q-jets are easy to rebuild. Make sure it is clean and set every damn measurement that comes in the directions. Set it for your application as the directions state and it'll run great.

 

[Zoomalot]

I second (do yourself rebuild, very easy if you know what a screwdriver looks like)??

 

[1987 GMC Jimmy]

I second (do yourself rebuild, very easy if you know what a screwdriver looks like)??

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[dougbert]

You can get great kits here:

https://cliffshighperformance.com/

and Cliff literally wrote the book on Q-Jets. You have to understand them to get them to work well

dougbert

 

[dougbert]

Unless you know an old timer who’s good with that sort of thing, I’d send it in the mail somewhere (i.e. Mountain Man Carb and Fuel or Quadrajet Power). My dad took two Q-Jets to a local guy, and he totally botched both of them. It sounds like a case of the sat too long.

Cliff performance has a 1 YEAR queue on rebuilds, he does a great job

dougbert

 

[82sbshortbed]

Some may need bigger screwdrivers than others. Lol

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