91 100hp runs great 10 sec before runs out of gas

TenE307

Petty Officer 2nd Class
Joined
Feb 18, 2003
Messages
193
just got the project boat back on the water! it ran perfect before i took it off the boat. problem is that at idle, motor shakes about every 5 to 10 sec. then cant get it above 4000 rpm or 30 mph (prob blow out at 4100). until last night i was running low on gas to see how low new tank setup reads at empty (for future reference, and i had a gas can) well about 10 sec before it runs out of gas it runs perfect, hops up to 4800 rpm and im doing 40 mph, then it dies. well plan was to go back to dock after i ran out of fuel. no way, after hearing it and seeing it work so good, i tried it again. and yes it ran perfect for 10 sec right before it died (again). but then i headed back to the dock. tonight i am taking the back seats out to see if they were pinching the vent tube. i also took out a fuel filter i had between tank and motor. Any other suggestions?
 

timmathis

Lieutenant
Joined
Apr 24, 2005
Messages
1,295
Re: 91 100hp runs great 10 sec before runs out of gas

Fuel pump?
 

TenE307

Petty Officer 2nd Class
Joined
Feb 18, 2003
Messages
193
Re: 91 100hp runs great 10 sec before runs out of gas

replaced fuel pump before i started the project. maybe 10 hrs on it.
 

timmathis

Lieutenant
Joined
Apr 24, 2005
Messages
1,295
Re: 91 100hp runs great 10 sec before runs out of gas

Also could be carb adjustment.
 

TenE307

Petty Officer 2nd Class
Joined
Feb 18, 2003
Messages
193
Re: 91 100hp runs great 10 sec before runs out of gas

boat guy adjusted carbs and got it timed to 4 deg yesterday before going to the lake. can turn it off and on 3 or 4 times in a row. (thats how boat guy says you can tell if carbs are okay, if it doesnt turn over between starts.)
 

TenE307

Petty Officer 2nd Class
Joined
Feb 18, 2003
Messages
193
Re: 91 100hp runs great 10 sec before runs out of gas

talked to boat guy and he says that there is a possibility one of the new jets we put in could bo loose. more inspection later, and hopefully a lake test if clouds quit building.
 

TenE307

Petty Officer 2nd Class
Joined
Feb 18, 2003
Messages
193
Re: 91 100hp runs great 10 sec before runs out of gas

well took it to the lake last night. took out the fuel filter between tank and motor. took carbs off and cleaned and checked the jets. it ran 4200 rpm and 31 mph. getting closer!<br /><br />here is a video from start to WOT!<br /><br /> http://www.zippyvideos.com/58659451581325.html
 
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