| Author |
Message |
    
greencorn
Member
Username: greencorn
Post Number: 14
Registered: 11-2012
| | Posted on Wednesday, June 03, 2015 - 03:49 pm: | 
|
I am currently installing a Frisco Standard in my boat and the information I have says the carburetor should be 8" below the gas tank. I don't have a place to install the tank above deck and the bottom of the tank inside the hull is about 2" above the top of the carb; will this work or must it be 8"?
ron |
russell
Senior Member
Username: russell
Post Number: 77
Registered: 08-2003
| | Posted on Wednesday, June 03, 2015 - 04:20 pm: |
|
I guess 8" allows a suitable head of fuel should the boat pitch and roll some or take a list when the crew rush the side. If the tank is close to the engine and on the centreline it would be oK surely. You'll have to try it. |
jb_castagnos
Senior Member
Username: jb_castagnos
Post Number: 1070
Registered: 07-2002
| | Posted on Wednesday, June 03, 2015 - 07:04 pm: |
|
A full tank of fuel will be OK, may starve as the tank gets low. It will still run, may have to throttle down, a larger fuel line will help, keep the tank as close as possible. |
greencorn
Member
Username: greencorn
Post Number: 15
Registered: 11-2012
| | Posted on Wednesday, June 03, 2015 - 07:13 pm: |
|
OK, thanks fellas. I don't know why the company instructed operators to have the fuel tank 8" above the carb unless it is as you have mentioned above. Seems like as long as gas is running into the carb (and out.........)it's flow is regulated by the float, so it wouldn't make any difference how low the tank is. |
jb_castagnos
Senior Member
Username: jb_castagnos
Post Number: 1071
Registered: 07-2002
| | Posted on Wednesday, June 03, 2015 - 10:24 pm: |
|
Too low and you lose head pressure, it may not maintain a full bowl under a load. |
johnoxley
Senior Member
Username: johnoxley
Post Number: 133
Registered: 04-2010
| | Posted on Wednesday, June 03, 2015 - 11:20 pm: |
|
The makers might be thinking what could happen if the engine starves of fuel during bad weather on a lee shore - Need a slight reserve head in case of bad weather. Note that display engines and lawnmowers often have minimal fuel tank heads and this is fine, but these engines are not in a life threatening environment. If your family and friends are in the boat, I would like to know that the fuel head is OK. |
russell
Senior Member
Username: russell
Post Number: 79
Registered: 08-2003
| | Posted on Wednesday, June 03, 2015 - 11:36 pm: |
|
You could machine up a little manual air pump and fit a filler that will seal the tank so it will hold a small pressure. Wouldn't take much to equal an 8" head. |
greencorn
Member
Username: greencorn
Post Number: 16
Registered: 11-2012
| | Posted on Thursday, June 04, 2015 - 09:53 am: |
|
Well, now I'm a bit confused. "Head pressure"? Seems like as long as the bowl is below the bottom of the tank it would remain full. I'll be using a tank 36" long and 10" deep and the bottom is about 3 1/2" above the inlet on the carb. The boat would have to be healed over almost 45 degrees before the fuel would be above the carb, highly unlikely and would occur only intermittingly during bad weather. Anyone have a definitive answer? Thanks.
ron |
russell
Senior Member
Username: russell
Post Number: 80
Registered: 08-2003
| | Posted on Thursday, June 04, 2015 - 05:26 pm: |
|
As long as the poor old thing is well fed, she will be happy. Short pipe no restrictions as big a bore as possible. You need a bit of pressure to full the carburetor/diffuser bowl. My green Frisco has the orignal type carburetor where an "umbrella" lifted off the fuel supply to admit some gas on induction. Might have needed a good flow of gas. The red Frisco has a Schebler, which as, J.B says, probably needs a bit of pressure to the flow. You got to try it, my boy; and let us know what transpired. Then the knowledge of the world will take a big step forward and the world will be a better place! |
greencorn
Member
Username: greencorn
Post Number: 18
Registered: 11-2012
| | Posted on Thursday, June 04, 2015 - 07:08 pm: |
|
Ok, it'll take a few days as I have to install the gas tank under the middle deck. I didn't want to put the tank above deck as it might interfer with moving around the boat and fishing. If it weren't for that I'd mount the beautiful copper tank where it could be seem. Been a while since anyone called me "boy", made my day. |
russell
Senior Member
Username: russell
Post Number: 81
Registered: 08-2003
| | Posted on Thursday, June 04, 2015 - 07:38 pm: |
|
"My boy" could be regarded as an expression of endearment to a fellow sufferer of old engines.... |
russell
Senior Member
Username: russell
Post Number: 82
Registered: 08-2003
| | Posted on Thursday, June 04, 2015 - 07:39 pm: |
|
Old enginitis even! |
jb_castagnos
Senior Member
Username: jb_castagnos
Post Number: 1072
Registered: 07-2002
| | Posted on Thursday, June 04, 2015 - 11:07 pm: |
|
It will probably be OK, as Russel says, use a larger line to feed it, last resort would be to lower the carb if you have trouble. |
greencorn
Member
Username: greencorn
Post Number: 19
Registered: 11-2012
| | Posted on Friday, June 05, 2015 - 10:20 am: |
|
Is there some way I can determine when my engine was built? I don't see any serial numbers or tags anywhere. I've seen other pictures where there are brass plates but my motor shows no indication of there ever being one. |
russell
Senior Member
Username: russell
Post Number: 83
Registered: 08-2003
| | Posted on Friday, June 05, 2015 - 04:57 pm: |
|
Post a picture or two and let's see the beast. |
