Boat

Have Boat Questions? Ask a Boat Repair Expert.

Ask an Expert,
Get an Answer ASAP!

I have a 2001 mercruiser 5,7 liter EFI throttle body. turn…

Customer Question
I have a 2001 mercruiser...
I have a 2001 mercruiser 5,7 liter EFI throttle body. turn key, fuel pump comes on, engine starts. It runs about 30 seconds and shuts off. I assume that the fuel pump is shutting off. ther is a purple wire coming out of the ignition switch which goes to the kill switch. A purple wire goes out of the kill switch to a round black cylinder about half the size of a small spool of thread. a white wire with a blue stripe comes out of that cylinder and goes to the back of the boat. The kill switch has been wired around,so the purple wire goes directly from the ignition switch to the little black cylinderI'mwondering what the little black cylinbder is and if it might be bad, Or any other ideas. Happy to pay for advise if we fi the problem.
Submitted: 2 years ago.Category: Boat
Show More
Show Less
Ask Your Own Boat Question
Answered in 2 minutes by:
2/13/2016
Marine Mechanic: Jason, Marine Mechanic replied 2 years ago
Jason
Jason, Marine Mechanic
Category: Boat
Satisfied Customers: 18,230
Experience: Degree in Marine Technology. Gas and diesel marine mechanic.
Verified

Hi Jeff, my name is Jason.

Is the wiring on the engine all original or has somebody monkeyed with it?

I assume that the fuel pump is shutting off.

If we start assuming things your engine will never get fixed. Can you hook up a fuel pressure gauge and see if it is actually dropping fuel pressure as the engine stalls?

Ask Your Own Boat Question
Customer reply replied 2 years ago
I am the second owner, so I can not say for sure. As I said before, the "kill switch" was wired around. It also looks like the radio may have been added after manufacture. Other than that everything looks original.
I do not have a fuel pressure gauge. Is there another way for me to check this? I made the assumption that the fuel pump had shut ff because I can keep the engine running by pumping the throttle.
Marine Mechanic: Jason, Marine Mechanic replied 2 years ago

I do not have a fuel pressure gauge. Is there another way for me to check this?

No

When you say you can keep the engine running by pumping the throttle, Will the engine stay running at a higher rpms?

Ask Your Own Boat Question
Customer reply replied 2 years ago
no. I have to keep pumping it
Marine Mechanic: Jason, Marine Mechanic replied 2 years ago

Will it stay running if you pump it?

Ask Your Own Boat Question
Customer reply replied 2 years ago
I'm going to go try it now
Marine Mechanic: Jason, Marine Mechanic replied 2 years ago

OKay

Ask Your Own Boat Question
Customer reply replied 2 years ago
It will stay running only if I keep pumping it. I requested a phone call, but I have to leave the boat now. Can we continue this tomorrow morning?
Marine Mechanic: Jason, Marine Mechanic replied 2 years ago

Tomorrow is fine, I actually am about to leave for the evening. Can you get the serial number off of the engine for me.

Ask Your Own Boat Question
Customer reply replied 2 years ago
engine serial # 0M071834
In a previous email, I mentioned a black cylinder about half the size of a spool of thread. It is at the end of a purple wire that comes off the ignition switch and the kill switch. I believe that cylinder is an alarm. It beeps twice when I turn the ignition key to "on" position, and I hear the fuel pump come on. I then turn the key and start the engine, and the cylinder beeps two times when the engine starts.
I'm a "shade tree mechanic", and I think this may require more knowledge and testing equipment than I have. I had hoped it might be something simple in the wires by the ignition switch and that with a little advice I could fix it. If you have some things you think I can try, I will do so. Otherwise, I can take it to a mechanic tomorrow.
Marine Mechanic: Jason, Marine Mechanic replied 2 years ago

Got the serial number. The engine is going to need some troubleshooting in order to figure out the problem. Tools required are a compression gauge, fuel pressure gauge, timing light, and because this is EFI, possibly a scan tool. I know you said you didn't have a fuel pressure gauge, so what would you like to do here? (I don't know what you have for tools or abilities)

Ask Your Own Boat Question
Customer reply replied 2 years ago
I have a compression gauge and timing light, but no scan tool. I think I should take it to a mechanic.
Thank you.
Marine Mechanic: Tan, MerCruiser Certified Technician replied 2 years ago
Tan
Tan, MerCruiser Certified Technician
Category: Boat
Satisfied Customers: 11,426
Experience: 40 yrs. experience with complete engine repairs both inboard/outboard and MerCruiser Certified Technician.
Verified

Hello. My name is Tan.

Do you have a volt meter to test for voltage at the fuel pump when the engine quits?

You could very well have a bad ECM. The ECM sends voltage to the fuel pump when engine starts initially. If you are loosing voltage to the fuel pump after it starts you have to replace the ECM. They had some issues with these ECM's.

What you can do to verify this as the problem is connect 12 volts to the fuel pump see if engine continues to run.

There is a kit you have to buy to replace this ECM as your ECM is no longer available.

Post back with findings.

Ask Your Own Boat Question
Was this answer helpful?

How JustAnswer works

step-image
Describe your issueThe assistant will guide you
step-image
Chat 1:1 with a marine mechanicLicensed Experts are available 24/7
step-image
100% satisfaction guaranteeGet all the answers you need
Ask Tan Your Own Question
Tan
Tan
Tan, MerCruiser Certified Technician
Category: Boat
Satisfied Customers: 11,426
11,426 Satisfied Customers
Experience: 40 yrs. experience with complete engine repairs both inboard/outboard and MerCruiser Certified Technician.

Tan 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:

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

He answered my question promptly and gave me accurate, detailed information. If all of your experts are half as good, you have a great thing going here.

DianeDallas, TX

< Previous | Next >

Meet the Experts:

Dominick

Dominick

Marine Mechanic

1,009 satisfied customers

25 Years Experience as Mechanic, 20 Yrs Boat Yard Owner/Mechanic, Factory Certified

Ted G.

Ted G.

Rigger, Diagnostician

704 satisfied customers

40 years boating, Safe boating instruct., Offshore Race promoter, Failure Analysis, Expert Witness

John White

John White

Marine Mechanic

306 satisfied customers

11 years experience working on outboards, inboards, sterndrives & pwcs

Jason

Jason

Marine Mechanic

18,230 satisfied customers

Degree in Marine Technology. Gas and diesel marine mechanic.

Tan

Tan

MerCruiser Certified Technician

11,426 satisfied customers

40 yrs. experience with complete engine repairs both inboard/outboard and MerCruiser Certified Technician.

Jeff G.

Jeff G.

Marine Mechanic

4,729 satisfied customers

42 years experience, Certified Master Technician, All Major Outboards, Sterndrives, Hi-Performance

Captain Dave

Captain Dave

Marine Mechanic

2,672 satisfied customers

USCG Licensed Captain, 20+ Years Boating, Fishing, Maintenance and Repair Experience

< Previous | Next >

Related Boat Questions
Mercury 225 optimax, no warning horn when key is turned on,
mercury 225 optimax, no warning horn when key is turned on, cranks but wont start. something with kill switch and/or warning horn wiring … read more
Clamp-onTech
Clamp-onTech
405 satisfied customers
I have a 93 Caravelle with 5.0 ford multiport FI (OMC Cobra)
I have a 93 Caravelle with 5.0 ford multiport FI (OMC Cobra) no fuel pressure. Has a low and high pres pump. I'm getting power to the plugs until I plug the other one in. When I do that the power goes… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,426 satisfied customers
I have a 1994 Crownline with a 5.0 Mercruiser. Changed out
I have a 1994 Crownline with a 5.0 Mercruiser. Changed out original throttle control with kill switch to a new Mercruiser Mercury 4000 Gen II Concealed Side Panel Remote Control #8M0011213. This new o… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,426 satisfied customers
Where do I connect my fuel line on a Mercury 150 optimax
Where do I connect my fuel line on a Mercury 150 optimax 2005 there is an inlet on the fuel pump and one on the lower motor underneath the starter I just purchased this motor and I'm installing it on … read more
Clamp-onTech
Clamp-onTech
405 satisfied customers
Brought my boat back to trailer and engine would not shut off
Brought my boat back to trailer and engine would not shut off by key or kill switch. Had to turn battery off and boat ran for a min and finally shut off. No when I turn battery back on, fuel pump is r… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,426 satisfied customers
ok so i have a 1995 four winns 190 horizon with a 5.0 ford
ok so i have a 1995 four winns 190 horizon with a 5.0 ford motor. just got a new stereo system installed last week and yesterday was the first time taking the boat out since ( so this question may rel… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,426 satisfied customers
i ahve 1998 mercruiser 5.7 efi. Will not start. Seems to
i ahve 19989 mercruiser 5.7 efi. Will not start. Seems to be getting spark and all cylinders had great even compression. It is a 1998 model… read more
Malta Tech
Malta Tech
Marine Tech
High School or GED
151 satisfied customers
I have a2002 sea ray with a 5.0L alpa. The boat will not shut
I have a2002 sea ray with a 5.0L alpa. The boat will not shut of have replaced the ignition switch checked the wireing checked the starter. Will turn off when disconected from the ecm. Will not turn o… read more
James
James
Certified Marine Mechanic
Vocational, Technical or Trade Scho
4,094 satisfied customers
i have a discovery 195 bayliner, new last year. took the battery
i have a discovery 195 bayliner, new last year. took the battery out for the winter and kept it on charge. just re-installed it and all gages come on, but ignition switch does not turn on.… read more
James
James
Certified Marine Mechanic
Vocational, Technical or Trade Scho
4,094 satisfied customers
I have a Johnson 1998 150 outboard. It runs great about half
I have a Johnson 1998 150 outboard. It runs great about half of the time. Temperature seems to play a part. This winter, I had it out a couple of times and had no problems. It starts and idles fine. I… read more
James
James
Certified Marine Mechanic
Vocational, Technical or Trade Scho
4,094 satisfied customers
Hi, I am building a runabout and have a Mercury 60 EFI 4 stroke.
Hi, I am building a runabout and have a Mercury 60 EFI 4 stroke. I wired the boat for the smartcraft gauges. Just found out the 60 HP EFI 4 stroke engine does not support all the smartcraft functions.… read more
James
James
Certified Marine Mechanic
Vocational, Technical or Trade Scho
4,094 satisfied customers
i have dual yamaha gauges i just bought, used . for a 1991
i have dual yamaha gauges i just bought, used . for a 1991 aquasport boat ,trying to wire ,here is my problem,tack works fine, but speed gauge comes up errer gas gauge blinks voltage and time works,wo… read more
Scott
Scott
Marine technician
Vocational, Technical or Trade Scho
542 satisfied customers
Boat question. 1973 boat. Had new engine put in it about 3
Boat question. 1973 boat. Had new engine put in it about 3 years ago. Boat is 22 feet long, fiberglass. Engine has no fire. Mercruiser 5.0. Thunderbolt 5 ignition. model mdm 5.0. 305 ci. engine number… read more
mercmastertech
mercmastertech
Service Manager, Master technician
Technical School
249 satisfied customers
i just got a 76 sleekcraft jet drive 460 ford motor and i took
i just got a 76 sleekcraft jet drive 460 ford motor and i took out the 460 motor and put in a 427 chevy.. i need a wiring diagram ( 20 ft. length) to find out where each wire goes to plus the color co… read more
gearheadII
gearheadII
Bachelor's Degree
138 satisfied customers
Hi, I have a 1993 Stingray, with a 4.3, carburated v-6, thunderbolt
Hi, I have a 1993 Stingray, with a 4.3, carburated v-6, thunderbolt 4 ignition. Boat has been well maintained, freshwater, great condition. My recent trouble is, the boat will start up pretty well, th… read more
mercmastertech
mercmastertech
Service Manager, Master technician
Technical School
249 satisfied customers
i have problem with my alternator when i cut the kee off the
i have problem with my alternator when i cut the kee off the engine still running so i have to take away the purple cable going to alternator then engine stop running i have changed the alternator to … read more
Jeremy R
Jeremy R
1,069 satisfied customers
I need to wire an ignition switch for a 40 hp Johnson boat
I need to wire an ignition switch for a 40 hp Johnson boat motor. Model TJ40ELCEC. This also has a kill switch. What is the color code?… read more
Captain Dave
Captain Dave
Marine Mechanic
Master's Degree
2,672 satisfied customers
1984 150 blackmax was on lake yesterday running fine backed
1984 150 blackmax was on lake yesterday running fine backed out of throttle then it stopped dead in water motor will crank but no spark (at the same time a wave hit boat bumped a little but not great … read more
Abiorca
Abiorca
Proprietor
Vocational, Technical or Trade Scho
1,768 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