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View Full Version : OMC Tech How much fuel PSI???


83PREDICTOR
04-27-2009, 09:18 AM
I have a small fuel pump that I want to put on my 115 crossflow. How much pressure can I put on this engine? The fuel ball keeps getting sucked dry.
Forkin' Crazy
04-27-2009, 09:22 AM
I have a small fuel pump that I want to put on my 115 crossflow. How much pressure can I put on this engine? The fuel ball keeps getting sucked dry.

If it is sucking the primer bulb flat, you have a restriction.

Bad valve in primer bulb

bad check valve in tank

kinked to stopped up line.


I wouldn't put an electric on a V4. It doesn't need it.
captglm
04-27-2009, 10:17 AM
:iagree: :thumbsup: I have always been told that the fuel pumps working if it sucks the primer ball flat. I just had the same issue. I had a bad anti syphon valve. I changed to a fuel barb and solved my problem. it could be a stopped up vent also.. but definitely a restriction... look in search for fuel restrictions or fuel pumps for more info.

GM
83PREDICTOR
04-27-2009, 12:11 PM
Thanks for the fast reply.
I dont know if makes a diff or not but it is not sucking the bulb flat I just have to keep pumping it while the engine is running?
Thanks for the good info so far. Today when I get home I'll check the screen in the tank and replace the bulb.:thumbsup:
Riverratt
04-27-2009, 12:23 PM
If you have to keep pumping the bulb to keep it running then it probably is the pump.
baja200merk
04-27-2009, 12:45 PM
sure sounds like the pump, pm me later might have a used one you can try :thumbsup:
83PREDICTOR
04-27-2009, 02:14 PM
I dont know shiz with a z

What do you guys mean the pump and were is it?
Forkin' Crazy
04-27-2009, 02:31 PM
What year? It has a pulse diaphragm pump that operates from the pressure oscillations of the crankcase pressure. The fuel pump is located on the port side rear of the air box.
83PREDICTOR
04-27-2009, 02:49 PM
it is a 1995 and in a Boston Whaler jet boat. here is a pic of the front
http://i138.photobucket.com/albums/q266/apollobch/boat2/IMG_0614.jpg
Forkin' Crazy
04-27-2009, 02:56 PM
:eek: Dammed if I know!!! :eek:

Normally they are in between the air box and starter... I see the starter :eek:

Trace the fuel line from the carbs and see where it goes.
83PREDICTOR
04-27-2009, 08:33 PM
After further review, it turns out that my 14ft Boston Whaler Rage with 115 Crossflow dose not have the fuel pump that you guys are talking about. It turns out that Boston Whaler uses a separate pump that also mixes the oil into the fuel before it goes to carbs. Needless to say, that pump is junk and I removed the oil tank. So I plumbed in a small fuel pump and premix now. Thanks for the replies guys.
baja200merk
04-27-2009, 08:47 PM
glad u got it figured out, couldnt find a pump :nonod:
Forkin' Crazy
04-27-2009, 08:51 PM
After further review, it turns out that my 14ft Boston Whaler Rage with 115 Crossflow dose not have the fuel pump that you guys are talking about. It turns out that Boston Whaler uses a separate pump that also mixes the oil into the fuel before it goes to carbs. Needless to say, that pump is junk and I removed the oil tank. So I plumbed in a small fuel pump and premix now. Thanks for the replies guys.

You ain't leaving here with out a picture of your boat! Come on now, don't be shy!!!!

:D

http://i120.photobucket.com/albums/o168/forkincrazy/funky3.jpg
83PREDICTOR
04-28-2009, 06:19 AM
You ain't leaving here with out a picture of your boat! Come on now, don't be shy!!!!

:D

http://i120.photobucket.com/albums/o168/forkincrazy/funky3.jpg

Thats funny, I'll post a pic of the real boat later. Duttin special.