where is the fuel pump located on 6v92?

harleyman_1000 · December 19, 2014, 09:09:53 AM

I have followed the fuel lines and they seem to all go to different places on the engine? I have 6 separate fuel lines and they seem to all come from the primary and secondary fuel filters and straight to different places on my engine?

wildbob24 · December 19, 2014, 09:17:40 AM

It's buried up under the coolant crossover just to the left of that lifting bracket. Has 2 lines going to the 90 degree fittings.

Bob

harleyman_1000 · December 19, 2014, 09:34:07 AM

Quote from: wildbob24 on December 19, 2014, 09:17:40 AM
It's buried up under the coolant crossover just to the left of that lifting bracket. Has 2 lines going to the 90 degree fittings.

Bob

Is one line a incoming and the other a outgoing? How can I test to see if it is working? Can I simply take one of the lines off and see if fuel comes out when I crank the engine?

usbusin · December 19, 2014, 09:40:23 AM

Scott, tell us what you are trying to accomplish.

GaryD

luvrbus · December 19, 2014, 09:49:57 AM

I think he has a shut problem Gary it runs till it get a little air build up then shuts off like no fuel or he is not getting a good prime I have to just pickup bits and pieces from his post

harleyman_1000 · December 19, 2014, 09:54:17 AM

Well several weeks ago I started the bus and it ran for a couple minutes and then started to run rough. I shut it off and the next day tried to start it, and it would start and run for about 30 seconds and die. I was told to change the fuel filters and add some fuel in case it had run out of gas. I did all this and it still only starts and runs rough for a short time(sometimes it will run for a minute or 2, and other times it only runs for 30 seconds. When I changed the fuel filters, I found out the 2 spin on filter points are both secondary filter size, so I had to use 2 secondary filters( this is how it was set up and ran fine from Phoenix to St. Louis with no problem). I only added 12 gallons, but am thinking(not sure) that if it ran out of fuel, and I added 12 gallons that should be enough to get it to run ok? My generator runs off the main tank and will start and run fine, and they usually stop running before the bus runs out of fuel, so I'm thinking I have enough fuel, so it must be something else? I'm at a total loss.

harleyman_1000 · December 19, 2014, 09:58:22 AM

Clifford, what is a shut problem, and how can I or what do I check to see if it is the cause?

bevans6 · December 19, 2014, 10:03:29 AM

If you take lines off, take careful note of where they came from. It's real easy to hook them up backwards. Each head has an input and a return output, there is usually a cross-over from the return of one head to the input of the other head and there is a special restrictor fitting on the return output on one of the heads - that one goes back to the fuel tank. I would take off one of the input hoses that goes directly to one of the heads, I wouldn't take the fuel pump fittings off. If I wanted to test to see if it was working (and it won't work without a good prime) I would just put a pressure gauge on the secondary filter. I would crank it and expect to see around 10 psi of fuel pressure at least. If I wanted to make sure it had a good prime beyond all doubt, I'd make me up a little fuel tank with a couple of quarts of fuel in it, hang it up above the engine and jimmy up a connection to the input of the fuel pump (bottom fitting is the inlet) and crank the engine.

luvrbus · December 19, 2014, 10:07:04 AM

Prime it good and leave the priming pump running start it and see if it keeps running it should even if the transfer pump is bad

harleyman_1000 · December 19, 2014, 10:53:53 AM

Ok now I am even more confused. I noticed that there is what looks to be a bolt head underneath the fuel pump that has fuel dripping off it. I removed the bottom or inlet fuel line from the fuel pump and heard a gurgling sound. I tried to start it and it started and ran fine? While running, the inlet line would spit a very small amount of fuel out every 5 seconds, but kept running until I turned it off?

harleyman_1000 · December 19, 2014, 10:56:01 AM

Clifford I tried running the prime pump while starting it and it seemed to make it die faster?

harleyman_1000 · December 19, 2014, 11:45:02 AM

Will it hurt it to start it and let it run for 10 minutes so I can move it 6 inches in my driveway without the inlet fuel line connected?

bevans6 · December 19, 2014, 11:55:36 AM

Well, it's Christmas time so I guess a miracle isn't out of order. For us mortals, how do you think the engine will run with the INLET line to the pump disconnected? Keeping in mind the fuel comes to the pump along the inlet line?

Brian

Purplewillie · December 19, 2014, 01:14:41 PM

Scott, any chance you have an air compressor that you could air up your bus before you even start it. That way it is ready to move the minute it fires up.
Mark

harleyman_1000 · December 19, 2014, 02:49:25 PM

I hooked my air compressor up and got it pumped up to 92 psi, and then started my bus up and ran it to get the air pressure up enough to move it( had to take both fuel filters off and fill them 3 times), but finally got it moved. I figured out that the inlet is the top line and not the bottom line on my fuel pump. I figured this out by taking the top line off and fuel came out it while running. While running when the bottom line was off it would spit fuel out a little and constantly put air out it. What could my problem be?