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Old 04-13-2019, 10:29 PM   #1
Bri
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Default VG30i with carb: idles fine, sputters out under load

I have an 86.5 with VG30i 4x4 and 32/36 Weber set up.
Truck decided to break down the other night and strand me for hours, I knew it was a fuel issue bc I'd tap the pump and it would work again for a short time, then shorter time between each break down and it's toggled so I could hear that it had power the entire time, even while failing. It's a Mr. Gasket 2-3 psi self regulated electric pump I installed about 2 years ago and hasn't had any issues until now.
I've recently (in past week) installed new battery, new spark plugs, new fuel filter, and now new fuel pump. Now, when I go to fire it up, it idles fine, but the second I engage throttle it sputters out and tries to die. I release throttle, instantly returns to healthy idle. My idea is that there's some kind of blockage of the needle jets, or the floats are sticking, or something of that nature involving the carburetor. I don't have time to tear anything apart or do anything I'd like to do until I can get a break from work. This is my daily for now. Can I put seafoam in my tank and change my air cleaner on the carb and expect an improvement? Never used it before but heard wonders about it...
I attempted to post a video but failed and am new here so idk how to do that so all you can have is my description unless you request me to send it in a message or via email..
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Old 04-13-2019, 11:56 PM   #2
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Welcome to infamous Nissan! I haven’t messed with carbs too much but we have a few guys that can probably offer some advice. I’d try spraying some carb cleaner through it to see if maybe it can free up something.
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Old 04-14-2019, 10:48 AM   #3
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My carb has two valves for the fuel line, I assume there's a bearing in there so the unused one doesn't leak fuel while the other one has a fuel line attached to it. If that is the case, maybe the bearing is stuck on the side the fuel line is attached to. Not sure yet, I'll try today after sunrise so my neighbors don't flip out, and I'll keep you posted. I hope that's it..
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Old 04-14-2019, 06:13 PM   #4
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I have a carbed VG30i also. The 32/36 carb is for the four cylinder Z24i. The self regulating pump might be part of your original and current problem. The throttle bodies run on 35 psi or so, and an external regulator is used to keep it between 2 to 3 psi. If the carb is too small, it can’t keep up with the fuel demand for anything more than an idle.
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Old 04-14-2019, 08:38 PM   #5
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Yea I'm interested to know exactly how you installed it and whether or not it's the right carb for your engine. Weber very very rarely have jet or float problems....
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Old 04-15-2019, 03:53 AM   #6
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I have a thread on it here. I removed everything. No more tbi, no vac lines at all other than the egr, did a pcv delete and also removed every bit of pollution control equipment. The big line off the exhaust manifold was connected to the feed pipe coming from the cat converter.

The fuel pressure is set to 2.75 pounds, I adjusted the choke to stay open all the time. It started like a champ in 10 degree and 75 degree weather.

I used the included adapter plates and loctite to prevent loose bolts.
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Old 04-15-2019, 08:57 PM   #7
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Yea I've seen your thread, nicely done, I was talking to op tho.
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Old 04-15-2019, 11:01 PM   #8
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Mine was efi and the prior owner swapped it and left all the plugs and wires from the original motor so it's a shit show. I have an idea what could be the issue. My carb has 2 fuel valves back to back and I assume it has a bearing in it so when the fuel line is on one valve, the other is plugged and won't leak fuel, and the bearing could be stuck on the side with the fuel line. I'm going to try seafoam.
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Old 04-16-2019, 06:21 AM   #9
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LOL stickeye I didn’t even see you were the one that posted. I thought it was the OP. Long day.
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Old 04-16-2019, 08:23 PM   #10
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Quote:
Originally Posted by Bri View Post
Mine was efi and the prior owner swapped it and left all the plugs and wires from the original motor so it's a shit show. I have an idea what could be the issue. My carb has 2 fuel valves back to back and I assume it has a bearing in it so when the fuel line is on one valve, the other is plugged and won't leak fuel, and the bearing could be stuck on the side with the fuel line. I'm going to try seafoam.
I wouldn't use seafoam.

Look down the barrel and pull the throttle cable, can u see fuel?
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