Small Engine

Small Engine Troubleshooting Problems? Ask a Mechanic Now.

Ask an Expert,
Get an Answer ASAP!

Small Engine
This answer was rated:

I have a generac 7550 exl w/brigs and stratton motor. It starts

I have a generac 7550...
I have a generac 7550 exl w/brigs and stratton motor.
It starts runs for about 30 seconds then shuts down.
There is plenty of (fresh) oil and it's not a fuel delivery problem (cleaned the float bowl)

Near the oil pressure sensor, there is a connected with 3 leads, when we disconnect that, it runs. (badly, very rough) but it runs.
Show More
Show Less
Ask Your Own Small Engine Question
Answered in 2 minutes by:
8/29/2011
Hank F.
Hank F., Technician
Category: Small Engine
Satisfied Customers: 15,474
Experience: Certified on Onan and Generac generators
Verified

Hello!
Thank you for choosing Just Answer for the solution to your problem.
My name is XXXXX XXXXX I am going to assist you with this.

 

What is the model number of the genset?

 

This connector you unplugged, what color or number were the wires in it?

 

Ask Your Own Small Engine Question
Customer reply replied 6 years ago
Model 01470

connector has 3 wires, White, Red, Yellow.

Also running like shit now (dunno if this is related to connector or messing w/carb) Seems to be running very rich now.

Was running fine all morning. Shutdown after showers this AM, started back up @ 6PM and had problems (did add fuel, which is fresh, bought just before the hurricane)

The 3-pin connector may or may not be the cause of the running - it is for ignition control and the oil alert monitor.

Plug it back in.

 

Go to the oil pressure switch, and remove both yellow wires from it. Isolate them so they can not touch ground.

Start the set.

 

Will it stay running now?

Is it running better?

 

Ask Your Own Small Engine Question
Customer reply replied 6 years ago
I removed the 2 wires from the stud and taped them off.
I then connected the connector, it remained running (priviously this would cause the motor to shutdown after about 30 seconds)

Still running like shit, seems to be running really rich, quite a bit of smoke, hard to tell color (it's dark here)

The shut down is caused by either low oil pressure, or a bad pressure switch - most likely the switch.

 

The bad running is going to be a dirty carburetor.

 

 

This is a classic symptom of a carburetor that has become plugged with varnish.

 

As gas gets old, it turns to varnish and clogs up the passageways inside the carburetor, not allowing enough gas to get to the engine.

This condition is cumulative. Every time gas sits, the varnish builds up just a little more, like coats of paint, until eventually gas can not flow. It will not happen overnight, but the symptoms can show up all of a sudden, even while simply stopping to refill with gas.

The use of fuel additives, such as Sta-Bil or Sea Foam will not stop this process from happening. They will greatly slow it down, but the gas will still go bad.

 

When this happens, either the engine simply will not start, or it will not run without the choke on (this reduces the amount of air getting pulled into the engine, changing the fuel/air mixture), or it will run but surges.

 

Another issue that varnish in the carb can cause is that the varnish may not allow the float needle to seal properly against the seat, causing the flow of gas to not shut off when the bowl is full. The result will be gas overflowing the carb and running into the cylinder, and possibly out the air intake. If the gas gets into the cylinder, it will seep past the rings and down into the crankcase. This will be evidenced by your oil level being over-full and/or the oil smelling like gas.

 

The only 2 solutions are to either replace the carburetor or give it a good, thorough cleaning.

When removing the carb, make sure to take a good picture, or make a good drawing of where all springs and linkages are attached. This will make reassembly much easier.

Most people believe that cleaning a carb involves removing the bowl and wiping it out, then spraying some carb cleaner through it.

This is simply insufficient.

To properly clean the carb, you must remove it, disassemble it (making sure to remove all non-metal parts), and soak it in a commercial solvent for several hours. Soaking it overnight is even better.

Then clean all solvent off with a spray type carb cleaner, making sure to get lots of cleaner into every hole and passage there is. Pay special attention to the tiny holes in the bore of the carb, under the throttle plate for the carbs that have these holes. Use lots of cleaner. And make sure to wear safety goggles to avoid getting the over spray into your eyes. There will be over spray.

Dry the carb with low pressure compressed air.

When reassembling the carb, make sure to use a carb kit, when one is available for your carb.

 

Occasionally, even a good cleaning is not going to be sufficient, and you may end up having to replace the carb anyhow. Be prepared for this.

 

If for some odd reason this does not help, please let me know so I can assist you further.

 

Ask Your Own Small Engine Question
Customer reply replied 6 years ago
I'm thinking the float. We took it apart, as the initial indication was fuel starvation (the oil light never came on). It would run for the 30 or so secs, then stall.

We flushed it out with carb cleaner (I know not as good as a good soak in parts cleaner). It was running fine this morning, so we were thinking that I might have stirred some crap up in the tank when I fueled it.

I bet your right, the float isn't closing. (in 3 hours we used the entire tank of fuel, that normally last 8 hours)

I'll strip it down again in the morning when it's light out.

thanks

If it went through that much gas, also check you oil to make sure it is not contaminated with gas.

 

Hank F.
Hank F., Technician
Category: Small Engine
Satisfied Customers: 15,474
Experience: Certified on Onan and Generac generators
Verified
Hank F. and 87 other Small Engine Specialists are ready to help you
Ask your own question now
Ask Hank F. Your Own Question
Hank F.
Hank F.
Hank F., Technician
Category: Small Engine
Satisfied Customers: 15,474
15,474 Satisfied Customers
Experience: Certified on Onan and Generac generators

Hank F. is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

You did one super job of explaining to me everything there is to know about this fridge. I'm looking forward to asking you questions in the future.

JimmyBagley, IA

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!!

AlexLos Angeles, CA

Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult.

GPHesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

JustinKernersville, NC

Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around.

EstherWoodstock, NY

Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know.

RobinElkton, Maryland

< Previous | Next >

Meet the Experts:

Curtis B.

Curtis B.

Technician

14,377 satisfied customers

have worked on and around most engine models for 35 yrs./Polaris ATV expert

Rick

Rick

Factory Authorized Trainer

4,218 satisfied customers

Outdoor Power Equipment technical trainer since 1990, covering eight states.

Jon K.

Jon K.

Small Engine Diagnostic Expert

2,995 satisfied customers

Gold certified Stihl tech, Service Manager for a rental/repair shop.Certified in most small engines

James W

James W

Small Engine Troubleshooting Expert

2,986 satisfied customers

7 years as Mechanic & Parts Manager for Brother who has Owned Lawn & Garden Repair shop for 35 years

Vince O.

Vince O.

Small Engine Technician

2,858 satisfied customers

Over 30 years experience repairing lawn and garden equipment. Chainsaws, mowers,blowers and trimmers

RUSS

RUSS

SERVICE TECHNICIAN

1,723 satisfied customers

28 YEAR SERVICE TECHNICIAN

Wayne

Wayne

Engine Rebuilder

1,607 satisfied customers

many years on egine rebuilding, lawn mower,roto tiller,Truck,and small engines

< Previous | Next >

Related Small Engine Questions
Ariens 920001-ST624E Sno-Thro won't start. And yes. So far.
I'm an engineer, but...I've reread all the start procedures...its worked well for about 8 years....not a ton of use....I always change the oil...I've checked the spark plug for fouling as well as the gap. Oh and I'm careful about fouling the correct starting steps.… read more
JON
JON
Master Service Tech
MASTER SERVICE TECHNICIAN
1,507 satisfied customers
I have a mtd 145/38 I can not loc ate the fuse. Today.
today. Checked solenoid. It is ok but no power to key. … read more
Curtis B.
Curtis B.
Technician
Associate Degree
14,377 satisfied customers
I have changed the starter solenoid but mower still won't
I have changed the starter solenoid but mower still won't start … read more
Curtis B.
Curtis B.
Technician
Associate Degree
14,377 satisfied customers
How do I replace the clutch cable on a 221 LHP? I know what
How do I replace the clutch cable on a 221 LHP? I know what has to be replaced, but can't see lower end to hook it up. Does the top cover have to come off? I've only taken off the bottom. … read more
Curtis B.
Curtis B.
Technician
Associate Degree
14,377 satisfied customers
I have a portable champion generator it starts when you
I have a portable champion generator it starts when you choke it but dies as soon as you take the choke off … read more
Wayne
Wayne
Engine Rebuilder
Vocational, Technical or Trade Scho
1,607 satisfied customers
I have a 2016 Thor ACE 29.2 RV with a ONAN RV QG 4000
Hi, my name is***** have a 2016 Thor ACE 29.2 RV with a ONAN RV QG 4000 generator. I tried to start it the other day. It cranked over a couple of times, but the batteries were low. I found that one of… read more
Hank F.
Hank F.
Technician
15,474 satisfied customers
I a contractor table saw model 351.218330. Sorry, my problem
Sorry, my problem is that I can not crank the saw blade up and down. I assume it needs cleaning and oiling but I can get access to the worm gear to do the cleaning. I have tried to remove the side panels but the front panel does not come off??? … read more
Curtis B.
Curtis B.
Technician
Associate Degree
14,377 satisfied customers
I have an Aeriens Snowblower and it seems to clog up rather
I have an Aeriens Snowblower and it seems to clog up rather easily. I have to continually stomp the chute to clear it. Can you help me? Thanks. … read more
Wayne
Wayne
Engine Rebuilder
Vocational, Technical or Trade Scho
1,607 satisfied customers
Just want to check the year of our boat motor. Some of the
Hi there, just want to check the year of our boat motor. Some of the code is peelled off. F15AMH … read more
David Bowden
David Bowden
Owner
466 satisfied customers
I have a Prosine 2.5 that has been operating for 13 years. I
I have a Prosine 2.5 that has been operating for 13 years. I have an off-grid application with 12 volt setup and 6 Surette batteries. I now have a "10" "2" fault which tells me I have low voltage. The… read more
Curtis B.
Curtis B.
Technician
Associate Degree
14,377 satisfied customers
I have a kohler 48RCL generator and indicates an auto shut
I have a kohler 48RCL generator and indicates an auto shut down. Indicates Low Coolant. Coolant level is fine. Sensor issue. I have had this unit serviced twice before same issue. … read more
Wayne
Wayne
Engine Rebuilder
Vocational, Technical or Trade Scho
1,607 satisfied customers
My neighbors car open my garage door my door opener is a
My neighbors car open my garage door my door opener is a 1160 professional line with a red light is there away to change the codes I already held it down for different seconds and it just keeps blinki… read more
Wayne
Wayne
Engine Rebuilder
Vocational, Technical or Trade Scho
1,607 satisfied customers
My 2000 wolverine won,t start with button but will pullstart
my 2000 wolverine won,t start with button but will pullstart battery fully charged no fuse blown … read more
Curtis B.
Curtis B.
Technician
Associate Degree
14,377 satisfied customers
Troybilt 2100 will not start. This is the first time i
troybilt 2100 will not start. This is the first time i needed it since last year. We have had alot of below zero weather lately. I don't know if that has anything to do with it. Have new gas in it. … read more
Wayne
Wayne
Engine Rebuilder
Vocational, Technical or Trade Scho
1,607 satisfied customers
Are you able to diagnosis a problem with a curtis motor
Are you able to diagnosis a problem with a curtis motor controller? Specifically model 1268-5506.… read more
Curtis B.
Curtis B.
Technician
Associate Degree
14,377 satisfied customers
Hank could a 1505 error be battery related? I rest the error
Hank could a 1505 error be battery related? I rest the error code and tried to start manually and it just clicked...… read more
Hank F.
Hank F.
Technician
15,474 satisfied customers
I use a Honda 3000kw to a gentrac to provide emergency power
I use a Honda 3000kw to a gentrac to provide emergency power for a few essential circuits on my floating home. The 30amp cable to the gentrac is 60ft long. When using a tester I show reversed polarity… read more
Hank F.
Hank F.
Technician
15,474 satisfied customers
My onan 7500 diesel quiet is giving a primary code of 3-3
My onan 7500 diesel quiet is giving a primary code of 3-3 and after I push the stop button for the secondary code I get a 1-3 code my generator is in a 1999 holiday rambler endeavor RV diesel pusher i… read more
Hank F.
Hank F.
Technician
15,474 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x