Question about 1983 Jeep CJ5

3 Answers

Troubleshooting fuel system for 1975 jeep cj5

Why is my 1975 jeep cj5 fuel running very rich even though I replaced the carburetor, fuel pump, wires, spark plugs, cap and rotor? someone told me that aftermarket fuel pumps are defective is that true?

Posted by on

3 Answers

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

I have a 1974 CJ5 with a 258 I have replaced the carb,pump,plugs,wires,cap,button,coil filter and the jeep will idle fine but when you try to drive it or give it alot of fuel the jeep back fires and its like someone turned the fuel off. what could the problem be.

Posted on Apr 24, 2010

×

  • Level 1:

    An expert who has achieved level 1.

    Corporal:

    An expert that has over 10 points.

    Mayor:

    An expert whose answer got voted for 2 times.

    Problem Solver:

    An expert who has answered 5 questions.

  • Contributor
  • 7 Answers

Very-rich run sounds beyond an adjustment.

Carter YF carb? (1bbl) You don't say which engine/carb, so I am guessing I-6 with a 1bbl. It was most common engine in the mid-70's.

Most commonly a slobbering-rich running YF (we are thinking so slobbering rich it barely idles at all-black exhaust, but will run with throttle open, still rich) is usually a stuck float. The second most common will be a result of a hole in the accelerator pump diaphragm. In either case removing the air cleaner, and looking into carb while engine is running you will see fuel rapidly dripping from venturi. (ok, just in case you forgot, wear safety glasses for that part, don't get too close, a backfire is going to cause a face-flaming !) Some of the cheapo carb kits are not all that compatible with ethanol, and the diaphram will get soft and start to break down in very short order.

If the carb is not assembeled correctly, and the power-valve needle isn't installed correctly it will cause a rich off-idle condition.

Provided the engine is not missfiring, the problem has to be carb related. The only time I can think of ever seeing a fuel pump cause a rich condition it was a result of a performance fuel pump designed to produce 20+ psi overcoming the float valve.

Posted on May 19, 2009

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

    Sergeant:

    An expert that has over 500 points.

  • Expert
  • 475 Answers

Fuel pumps just supply fuel to the carb. Either they work or don't work. I would make sure that the mixture screws on the carb are set properly. Turn the screws in to lean out the mixture, do one at a time.
You want to turn the screws in to the point where the jeep will start to idle rough and then back out a 1/2 turn. Check your timing also. If the jeep has alot of miles on it, the timing chain will stretch and it's possible that you cannot get the correct timing.

Posted on Dec 30, 2008

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

4 Answers

Ive got fuel at the injector rod on my 1994 v8 jeep grand cherokee larado but the car wont start .. this all comes after runnin out of gas. its almost wasnts to but doesnt stay on at times and now won


If you ran out of gas there is a very good chance that the fuel pump relay has blown a fuse or requires a reset. Fuses and relays are in the main fuse box behind battery. When you turn your ignition on to the one setting before the starter engages you should be able to hear the fuel pump running. If it does not then check those fuses. If it does run then there is a good chance that the crank shaft positioning sensor needs replacement.

Oct 12, 2014 | 1994 Jeep Grand Cherokee

1 Answer

Chugs


fuel filter or a fuel pump could also be plugs, wires, cap and rotor I would try fuel filter first then take a plug off a cylinder and hold it close to screw driver or something(dont hold unless have rubber to grip to please dont get shocked) if it doesnt spark your not getting spark and try plugs wires cap and rotor if it does spark then open gas lid have someone turn ignition switch on and listen if you here the fuel pump is still good if not replace it. It does sound like a fuel pump

May 31, 2013 | 1995 Chevrolet Monte Carlo

1 Answer

1994 f150 4x4 super cab 5.0 turns over but wont start, fuel pump turns on, replaced coil, cap, rotor, plugs and wires?


Hello! Even though you have replaced coil, cap, rotor, plugs and wires; I need to know that you have a strong blue spark at a plug...Have you checked a plug for spark? I don't want you to misunderstand why I'm asking you that question; Certainly not to insult your knowledge but I need to know for sure that there is a strong spark...Guru..............Saailer

Aug 24, 2011 | 1990 Ford F150

1 Answer

I have a 1990 mitsubishi might max it wont run smooth unless you keep your foot on the gas and keep the rpms up a little bit and it wont drive cause it stalls everytime you try to move it. ive replaced the...


You've already eliminated the spark plug & wireset, distributor cap & rotor.
Sounds like your car needs a tune-up, specifically, the PCV (positive crankcase ventilation) valve, and/of the EGR (Exhaust Gas Recirculation) valve.

Components checked/replaced during a tune-up are:
air filter
motor oil
motor oil filter
breather filter
fuel filter(s)
fuel strainer
PCV valve
EGR valve
spark plugs
spark plug wires
ECM or distributor cap & rotor
cabin air filter
transmission oil filter
transmission oil
engine coolant
check all vacuum hoses and lines

Troubleshooting the no-start condition - from the 1990 Mitsu Mighty Max Repair Manual:

Priority Action Part Type -- Cause
1 Inspect Battery -- Battery Discharged or Faulty.
2 Inspect Battery Cable -- Corroded, Broken, Shorted or Poorly Connected Battery Cable.
3 Inspect Distributor Cap -- Distributor Cap Cracked or Burned.
3 Inspect Fuel Filter -- Clogged or Dirty Fuel Filter.
5 Inspect Ignition Coil -- Faulty Ignition Coil.
6 Inspect Wireset -- Worn, Damaged or Faulty Spark Plug Wire(s).
7 Inspect Spark Plug -- Incorrectly Gapped or Fouled Spark Plug(s).
8 Inspect Starter -- Starter Motor Faulty.
9 Inspect Fuel Pump -- Low Fuel Pressure.
10 Inspect Solenoid Switch -- Faulty Starter Solenoid Switch.
11 Inspect Fuel Pump Relay -- Faulty Fuel Pump Relay.
12 Inspect Fuel Injector Pressure Regulator -- Faulty Fuel Injector Pressure Regulator.
13 Inspect Ignition Switch -- Improperly Connected or Faulty Ignition Switch.
14 Inspect Starter Drive -- Faulty Starter Drive.
15 Inspect Fuel Injector -- Dirty or Worn Fuel Injectors.
16 Inspect Fuel Pump Strainer -- Clogged or Dirty Fuel Pump Strainerat.
17 Inspect Engine Control Computer -- Incorrect Operating Information Being Delivered and Sent From The EEC.
18 Inspect Fuel Tank -- Fuel Tank Empty.
19 Inspect Carburetor -- Carburetor Flooded or Faulty Choke.
20 Inspect Distributor -- Worn, Loose, or Incorrectly Installed Distributor.

Aug 17, 2011 | 1993 Mitsubishi Mighty Max

3 Answers

1975 Datsun (ie. mechanical fuel pump). Carburettor, electrics (inc. battery all good) fuel strainer all good. On cold start engine needs to be cranked several times. Warm start is invariably immediate. ...


Carburated vehicles ether have an automatic choke, or the very old ones, a hand choke. Yours has an automatic choke. The starting problem likely is a problem with the choke. The problem is almost certainly not the fuel pump.To set the automatic choke, push the accelerator to the floor, and RELEASE. Then start the engine just like you would a fuel injected vehicle. If this doesn't solve the problem, then the automatic choke needs to be repaired.

Oct 31, 2010 | Datsun Pulsar Cars & Trucks

3 Answers

93 jeep cherokee , iv got spark at the coil but not at the plug just replced cap, roter, wires, but still notheing got any ides ?


Coil may be producing low voltage (KVs) to where it makes enough energy to snap out of the coil tower but then supressed as it travels down the high tension leads finally to the plug. Incidentally spark plug leads should have about 10k ohms of resistance per foot.I good coil will jump spark at least a half inch if you pull the wire off the cap and produce this much air gap

Aug 26, 2009 | 1993 Jeep Grand Cherokee

1 Answer

Jeep Acts Like Out of Gas- HELP!


it sounds like the engine isnt getting enough fuel. I would suggest changing the fuel filter and possibly testing the fuel pump to see if it is bad.

Oct 20, 2008 | 1988 Jeep Cherokee

2 Answers

No fuel to carburetor/no spark to plugs


it could be the ecm"computer" that can cause know spark and know gas at the same time.

Jul 18, 2008 | 1985 Chevrolet El Camino

Not finding what you are looking for?
Cars & Trucks Logo

2,148 people viewed this question

Ask a Question

Usually answered in minutes!

Top Jeep Experts

yadayada
yadayada

Level 3 Expert

61168 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

21949 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

6812 Answers

Are you a Jeep Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...