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Engine Carburetor Questions and Answer - This category
contains featured questions as examples. They relate to most vehicles.
Question: 1976 Toyota Landcruiser FJ55 350 Chevy mileage: unknown. Hi.
Carburetor is running out of fuel when under a load. I have stopped the vehicle
as soon as the motor leans and quits. Checked the carburetor fuel bowl (350 Holley)
and no fuel. The truck has 2 tanks and a mechanical type switch. This happens on
both tanks. I have tried 2 pumps and 2 separate lines from the switch to the pump.
The pump is firewall mounted. Turning the ignition on after it stalls gradually
fills the bowl again for a restart.
The pump is giving about 60 liters per hour from a basic flow test I did. The
voltage seems ok at 13.5 volts and steady. I have checked the needle and seat, cleaned
out carburetor etc. It idles fine, accelerates fine, but just runs out of fuel when
under a load for a while. I'm suspect of the needle and seat, as I can't see what
else it could be. But the needle seems quite free and the float level is correct.
There is a lot of fuel pressure right at the carburetor inlet after it cuts too.
I'm baffled...HELP! Mark
Answer: Electric fuel pumps are good pushers but do not do well pulling
the fuel. Try relocating your electric fuel pumps as close to the fuel tank as possible.
Keep them as low as possible also. Make sure the tanks are properly vented so as
to be sure you are not forming a vacuum as you draw fuel out.
Question: 1986 Chevy Celebrity SW V6 mileage: 46,000. Engine starts but
tends to die or stall out when trying to accelerate. Have changed the fuel filter,
but it didn't help. A local mechanic here in Sitka, AK told me it probably needs
a new carburetor - apparently, there's some kind of electronic devices in the carburetor
that cannot be fixed here. He wants to charge me $500 for a new carburetor--Is it
possible to get a rebuilt one somewhere for less than that? Thank you for your help-Eric
Answer: Have your mechanic check for the availability of a rebuilt carburetor.
Also, your local Chevrolet dealer should have the individual parts that go in the
carburetor.
Question: 84 Plymouth 2.6 mileage: 140,000. This van has been having
problems off and on for approximately 6 months. The carburetor is flooding
but the engine is not stalling. It has low power and is guzzling gas.
Extremely low gas mileage. A service person said it was the catalytic converter;
it was replaced and hasn't cured the problem. It is running better but not
right. Also is there another catalytic converter inside the manifold.
Also tried a new oxygen sensor but couldn't find it to replace. The engine
is a Mitsubishi 2.6 litre what else could it be. Thanks
Answer: If your carburetor is flooding it probably is caused by a failing
needle and seat inside the carburetor or a bad float. Also, check for a vacuum
leak. The catalytic converters fail if the carburetor is running to rich due
to the extra fuel. Fixing the carburetor-flooding problem should be done before
replacing any of the catalytic converters. We have not worked on your model
car for a long time so we are not sure, but believe that there is "pre-cat" in the
manifold. If there is, it will be obvious because of the large bulge in the
manifold.
Question: 1987 Honda CRX 1.5 mileage: 116,000. The car sat for four
months because it needed a head gasket replaced. I did the repair and now it does
not want to stay running. It is as if it is starving for gas. If you keep pumping
the gas pedal, it will just idle. If you spray carburetor cleaner in the carburetor
it will run. Float problem or not?
Answer: From what you describe, it sounds like you need a carburetor
overhaul. In addition, check for vacuum leaks.
Question: 1966 ford bronco 170 mileage: 0. Have a new
motor and have replaced the fuel filters/fuel pump/ fuel line drained the tank and
cleaned it replaced the intake to carburetor gaskets and all vacuum line and checked
the timing. It idles fine but when I try to accelerate down the road it acts
like it is starving for fuel and the gas filter goes almost dry. If I disconnect
the fuel line between the carburetor and the filter, it seems to be pumping plenty
of fuel. If it is the carburetor, can I replace it with a new one instead
of a rebuilt (autolite 1100/1101 1 barrel) help?
Answer: Scope the engine and check point dwell and coil output.
Check fuel pump pressure. A new carburetor should work just as good as a rebuilt
one.
Question: 1983 Toyota Tercel 3A mileage: 150,000. I live in Flagstaff,
Arizona, Elevation 7000 feet. First the car gets poor fuel mileage and I believe
is running very rich (strong exhaust smell). The spark plugs are always fowling.
I have been told it needs to be Altitude Adjusted. Would that help and how would
I do that? Second Question: In the winter the water temperature never gets
warm enough for the heater to work. Do I need to install a different thermostat
and what kind?
Answer: Sounds like your carburetor needs to be rebuilt or replaced. Installing
a 180-degree thermostat should help the heater work better.
Question: Holley Projection 2 bbl throttle body carburetor. Will not start,
believe it's getting too much fuel, how do I adjust it? Part # 34R11109B. Please
reply as soon as possible, thank you, HELP!
Answer: Sorry we are not familiar with that injection system. Holley's
service hot line should be able to help you.
Question: 1970: VW Super Bee bug 1600 mileage: 2000 rebuilt: just wondering
what would be the right adjustment for gas and air mixture on carburetor? Thanks
Answer: The idle mixture should be adjusted with an exhaust gas analyzer
to ensure proper emissions. If we remember right, there are two adjustment screws
close together. The big one being idle speed, the small one, idle mixture. To get
it close, turn the idle mixture adjustment screw in (clock-wise) until the engine
speed drops. Back out adjustment to obtain the highest idle speed. Turn in 1/8 turn.
It should be very close.
Question: 1976 Dodge p/u 318 mileage: high. I need to know how to adjust
a 2-barrel carburetor for my p/u. I installed a rebuilt one ...when cold it doesn't
want to hold an idle...truck fells like sluggish when I go up hills and when I accelerate
from a stop it hesitates I just took the carb out of the box and put it on ...I
think the carb was a holly.
Answer: Make sure the main jets in the carburetor are the proper size
for your truck. From what you describe, it sounds like your carburetor is too lean.
In addition, check to see that the float level is correctly set.
Question: I have a '81 Malibu with a 305 cubic inch engine
with a two-barrel Carburetor. While driving at approximately 40-55 MPH engine suddenly
loses power (no sounds/as if stalled). As the speed falls below 40, the engine kicks
back on. This repeats if trying to accelerate again. I have replaced the fuel pump,
rebuilt the carburetor, and changed the distributor and coil. While "power-braking"
the engine, the fuel enters the carburetor for about one minute then the engine
dies. It acts as if it is starving for fuel. Could a hose collapse from the fuel
tank cause this condition? If not, what could?
Answer: Check for fuel in the carburetor when the engine
dies after power braking to isolate the problem to the fuel system. Some possible
causes include: 1. Cracked fuel hoses at the tank of pump, 2. Partially plugged
fuel pick-up filter in the gas tank, 3. Incorrect gas tank cap causing a vacuum
in tank, 4. Alternator diode failure allowing AC voltage to ignition coil. (Try
test-driving with the alternator disconnected.), 5. Faulty ignition module in Distributor.
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