Boat

Have Boat Questions? Ask a Boat Repair Expert.

Ask an Expert,
Get an Answer ASAP!

Please Help I have a 2001 model rampage express with 2 x…

Customer Question
Hi please HelpI have a...
Hi please HelpI have a 2001 model rampage express with 2 x Mercury 350 horizon with velvet shaft drivesMy boat has the same problem with both engines, however it does not happen to each engine at the same time.It will start and run fine with no load for hours and will rev freely up to the limit however when under load the boat will only rev up to 3000 rpm and feel very low on power.. it will run at 3000 rpm for about ten to 15 minutes before it looses fuel pressure gradually from 30 to 0 ,at 11psi it will start to back fire and I back it off the engine the engines with cough and splutter until the quit obviously with 0 fuel pressure , if I let it sit and cool down for an hour it will start and run fin until put in gear and under load again even if I only limp along at 1500 rpmbelow are comments to my mercury guy in Australia,In the past 12 months I have changes the entire fuel system, new filters put in fuel water traps ,new fuel lines ,run engines on remote tanks.
#Changed fuel pumps and regs ( runs 30psi consistently) until problem kicks in# changed distributor caps and upgraded the sensor inside, all spark plug leads ,new spark plugs, new coils, new ignition harness ( from key to main engine harness)#All New relays#New exhaust manifolds / risers to SS hitek design#New exhaust hoses# checked and cleaned vacume lines from throttle body to fuel regs#Cleaned spark arrestor several timesNotes to my service guys on work done to find next step forward.After hours of reeding I have discovered that the engines may be stuck in limp mode as they have only ever revved up to 3000 RPM and no more.Iam unsure if Simon ever had it revving more than 3000 rpm under load when he initially did his repairs and took it out for sea trail, Thought he said he did however I have never had it past 3K# can you please let me know if Simon has the compression information on the engines, I know one cylinder on the RH bank on Starboard eng was slightly down slightly however still ok all other's were fine.# what I found as a common fault on this engine in the forums is some models with ( rank angle sensors or map sensor ) faulting and puts the engines into safe mode not allowing them to rev or make HP and eventually cuts power to fuel pumps hence loss of fuel pressure, my engines feel down on HP like this, Obviously the bottom is dirty however it was like this at the start when it was clean also.# also Faulty ECM will do the same# incorrect or faulty spark plugs# Wiring into the coil was a problem on one guys engine, a wire had come loose in the connecting plug causing engine to go into limp.# other problems are timing and and the issues with the Dizzy cap and that sensor inside however simon has changed these. one guy who had the same problem, turned out to be stretched timing chains so could not get total advance at full throttle.Iam fairly confident that we need to do the following AFTER we confirm the ECMs are NOT in limp mode1- reset the timing and make sure we are getting total advance with a timing light
2- test ECM wiring for a fault to the fuel pump or relays as discussed
3- Check earths
4- Check MAP or crank angle sensor however I do not think mine run Crank sensor only a MAP ???
5- Check gear shift sensors ( in nee d to check as we may have recently changed these up in TSV, if not we have them but have not changed them )To Date FUEL system repairs
we have changed fuel pumps, fuel pressure regs and runs 30 psi fine for 10 or 15 min but will only rev to 3K, then it looses total fuel pressure to 0 PSI consistently, I have run the thing in gear at 1000 rpm for hours and it will not miss a beat however as soon as it goes into gear under load it lasts ten to 15 min and dies ( could it be gear shift sensor ? ):removed anti syphon valve on fuel return linethe injectors removed cleaned and checked fuel lines and rails replaced however I do not think that it is fuel any-more.Too Date IGNITION repairs
new coils & leads, Spark plugs
new dizzy caps and sensors
new ignition harness
???-- My serial numbersMerc 350 horizons, meant to be 300 HPL399009 & L399010Any suggestions welcome ( we have not tested for faulty ECM or ECM to fuel really wiring yet .Thanks
Submitted: 4 months ago.Category: Boat
Show More
Show Less
Ask Your Own Boat Question
Answered in 6 hours by:
3/9/2018
Marine Mechanic: Jason, Marine Mechanic replied 4 months ago
Jason
Jason, Marine Mechanic
Category: Boat
Satisfied Customers: 17,894
Experience: Degree in Marine Technology. Gas and diesel marine mechanic.
Verified

Good morning, my name is ***** ***** am I speaking with? I read what you wrote. Can you run the boat off of a different fuel tank, like a portable fuel tank, to see if the fuel pressure drops off or not when running on a portable tank?

Ask Your Own Boat Question
Customer reply replied 4 months ago
Hi Jason
Tim here I have tried a portable tank on both engines and no difference
Marine Mechanic: Jason, Marine Mechanic replied 4 months ago

HI Tim. Is the fuel pressure still dropping to zero when running on a portable tank?

Ask Your Own Boat Question
Customer reply replied 4 months ago
that correct Jason ,on the portable tank the engines will both run up to 3000 rpm but no more, for 5 to 10 minutes and then cues pressure starts to slowly drop from 30 psi to 0 at 11 the engines will start to backfire ..
Customer reply replied 4 months ago
I have replaced the entire fuel system on both engines, all lines, filters added in water separators, changed fuel pumps twice, two new pressure regs , removed all injectors and rails and tested and cleaned
Marine Mechanic: Jason, Marine Mechanic replied 4 months ago

Okay what you have to do next is make sure the fuel pumps are getting power when the engine stalls. What you would need to do is pierce the wires that go to the fuel pump, or use some self piercing wire problems. Hook a volt meter up to the those 2 wires. Run the engine and then see if the fuel pumps are loosing voltage when the fuel pressure drops, or see if voltage is 12 to 14V when the fuel pressure drops. Can you do that?

Ask Your Own Boat Question
Customer reply replied 4 months ago
Thanks Jason that was going to be my next test I will try and let you know how I go
Marine Mechanic: Jason, Marine Mechanic replied 4 months ago

Okay let me know how you make out.

Ask Your Own Boat Question
Marine Mechanic: Jason, Marine Mechanic replied 4 months ago

H​ello, just checking in. I never heard back from out. How did you make out?

Ask Your Own Boat Question
Customer reply replied 4 months ago
Hi Jason I have not made it down to the boat yet however I will in the next few days and I will get back to you
Marine Mechanic: Jason, Marine Mechanic replied 4 months ago

OK​ay let me know how you make out.

Ask Your Own Boat Question
Marine Mechanic: Jason, Marine Mechanic replied 4 months ago

Hello, just checking in, any progress?

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 Jason Your Own Question
Jason
Jason
Jason, Marine Mechanic
Category: Boat
Satisfied Customers: 17,894
17,894 Satisfied Customers
Experience: Degree in Marine Technology. Gas and diesel marine mechanic.

Jason 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

703 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

17,894 satisfied customers

Degree in Marine Technology. Gas and diesel marine mechanic.

Tan

Tan

MerCruiser Certified Technician

11,179 satisfied customers

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

Jeff G.

Jeff G.

Marine Mechanic

4,728 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
Second opinion] I have a Rampage 30 express running 2 x
second opinion] Hi there I have a Rampage 30 express running 2 x Mercuriser 350 Horizon MPI engines, both motors run fine for about 10 minutes at full load and then we loose fuel pressure dropping fro… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,179 satisfied customers
I have a Rampage 30 express running 2 x Mercuriser 350
Hi there I have a Rampage 30 express running 2 x Mercuriser 350 Horizon MPI engines, both motors run fine for about 10 minutes at full load and then we loose fuel pressure dropping from 30 psi down to… read more
Matthew John
Matthew John
Cert II Electronic Engineering
69 satisfied customers
Related to one of my last questions to you about my shift
Hi Jason, related to one of my last questions to you about my shift position sensor, I was finally able to get my hands on the output of my mechanic's computer test of my engine (see attached). Can yo… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
17,894 satisfied customers
I have a 2005 mcm 350 mag mpi will rev in neutral but when
I have a 2005 mcm 350 mag mpi will rev in neutral but when onder a load only revs to 2500 new fuel pump and filter … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
17,894 satisfied customers
I have a 07 merc 50 hp Efi 4 stroke, on a boat I just
I have a 07 merc 50 hp Efi 4 stroke, on a boat I just purchased That I'm told only has 35 hrs on it, the boat had been winterized at a shop then sat for a full season of no use, the owner then sent it… read more
Clamp-onTech
Clamp-onTech
405 satisfied customers
Fix my boat please. Boat appears to be in the safe mode.
Fix my boat please. Boat appears to be in the safe mode. Will not rev up beyond 3K. It has a 5.8 FSI (Ford 351W) Does this boat have a port for a code scanner.… read more
Joe
Joe
Owner Kingsland Auto & Marine Services
Vocational, Technical or Trade Scho
1,502 satisfied customers
I have a 75 hp mercserial# my problem is with controls in
I have a 75 hp merc(###) ###-####serial# ***** problem is with controls in neutral position motor revs up and won't idle. From off to start, instant high revs, in the 3k range. Obvious roughness with … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
17,894 satisfied customers
I have a volvo penta 5.7gi problem. Engine has about 450 hours, but sat over the winter w
I have a volvo penta 5.7gi problem. Engine has about 450 hours, but sat over the winter with water dripping on back of engine and cold temps. Fuel filters were changed and had water in them. Not sure … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
17,894 satisfied customers
Hi I Have a problem with a Mercruiser 5.0 Bravo EFI engine,
Hi I Have a problem with a Mercruiser 5.0 Bravo EFI engine, It will not rev above 3200 rpm under load. Engine details: 5.0 Bravo MY 2004 (October) Serial No: OWO68025. First fault was no fuel pressure… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
17,894 satisfied customers
93 OMC cobra ford 5.0 efi. serial #50FAPRJVB Im having an
93 OMC cobra ford 5.0 efi. serial #50FAPRJVB Im having an issue with my boat not reving up as high as it should in neutral. The whole engine and almost all other components have been replaced. But eve… read more
Joe
Joe
Owner Kingsland Auto & Marine Services
Vocational, Technical or Trade Scho
1,502 satisfied customers
I have twin 2004 135hp optmaxs, my starboard engine is shuting
I have twin 2004 135hp optmaxs, my starboard engine is shuting down around 3000 rpm. As long as I keep it under 3000rpm it will run all day. It is only when I go 3000 rpm or better. It will start righ… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
17,894 satisfied customers
I have a Suzuki df70 around 2000 model. When I start it up
I have a Suzuki df70 around 2000 model. When I start it up there is a beep exactly every 5 seconds. there are no warning lights in the gauge. I had the boat out today and the engine ran fine until I a… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
17,894 satisfied customers
when running both engines at 3000 rpms port engine had loss
when running both engines at 3000 rpms port engine had loss of rpm and couldnt throttle up past 2800 rpms. put engines in neutral and both throttled up fine only happened with load on engine.… read more
Abiorca
Abiorca
Proprietor
Vocational, Technical or Trade Scho
1,768 satisfied customers
1990 130 hp out board been running great ....0il full ...fuel
1990 130 hp out board been running great ....0il full ...fuel filter clean ...fuel line and ball good ..... plugs new.... fuel fresh .... ran great last week Problem .... top rpm 3000 or less… read more
Jeff G.
Jeff G.
Marine Mechanic
Vocational, Technical or Trade Scho
4,728 satisfied customers
Merc 50hp 2001 4stroke Out of gear snaps to 6000 rpm -
Merc 50hp 2001 4stroke Out of gear snaps to 6000 rpm - in gear dies after 3000rpm Have just spent 1700 on carb job and 400 on advance control electric control box any ideas where to look next!… read more
Jeff G.
Jeff G.
Marine Mechanic
Vocational, Technical or Trade Scho
4,728 satisfied customers
My volvopenta on my 22 Sea sport stalls out above 2000 rpm
My volvopenta on my 22' Sea sport stalls out above 2000 rpm when in gear. I can run the engine in neutral up to 3000-3500 rpm without any problems. We have done the routine yearly new parts, (spark pl… read more
James
James
Certified Marine Mechanic
Vocational, Technical or Trade Scho
4,094 satisfied customers
Have an 87 sea ray 268 with 7.4, just bought boat it came with
Have an 87 sea ray 268 with 7.4, just bought boat it came with a fresh overhauled 7.4 that we installed, I believe it is original to the boat. The engine runs fine at idle and in neutral but sputters … read more
Dominick
Dominick
Marine Mechanic
Vocational, Technical or Trade Scho
1,009 satisfied customers
I have a 1997 7.4 mpi merc engine that wont go above ...
I have a 1997 7.4 mpi merc engine that wont go above 3500rpm unless I unplug the map sensor then I get 4400 rpm I have replaced the map sensor and still have the same problem.… read more
Ted G.
Ted G.
Rigger, Diagnostician
Vocational, Technical or Trade Scho
703 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