Fuel delivery/pumping question for 2002 SD gurus
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Fuel delivery/pumping question for 2002 SD gurus
We are in the middle of installing a small 3-cyl 18HP diesel-power hydraulic system in an F-550 with the 7.3L SD. We would 'prefer' to 'T' off the existing pair of fuel lines going to the rear tank for fuel supply/return to the auxilliary engine...but what kinds of problems are we going to create by doing that? I could not even find anything definitive on whether the fuel is pumped from the engine end..or there is some sort of in-tank electric or other low-pressure supply in the thing.
Help...?
Help...?
Fleet Mechanic
Joined: Feb 2005
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From: Northern Colorado
The fuel pump is mounted on the frame rail under the drivers seat and delivers high pressure fuel to the engine via the fuel filter bowl. Excess fuel is returned through a regulator attached to the filter bowl and returned to the engine. The 3/8" fuel line on the tank is the suction line for the pump and the 5/16" line is the return.
I would suggest that you get a low pressure aftermarket pump and install it in the suction line, close to the tank. This would help feed fuel to the 7.3 factory fuel pump and will also give you low pressure fuel for your hydraulic engine if you installed a T on the outlet of this 'pusher pump'. This is a mod that many of us have done to help feed the factory fuel pump. If you need a return line for the small engine, you should be able to T into the existing return at the tank with no problems.
I would suggest that you get a low pressure aftermarket pump and install it in the suction line, close to the tank. This would help feed fuel to the 7.3 factory fuel pump and will also give you low pressure fuel for your hydraulic engine if you installed a T on the outlet of this 'pusher pump'. This is a mod that many of us have done to help feed the factory fuel pump. If you need a return line for the small engine, you should be able to T into the existing return at the tank with no problems.
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Thanks VERY much for that information. I just returned from buying a 12-gallon poly tank as a backup fuel solution..but the customer was not keen at all about having a separate fuel tank buried deep inside the box on the truck. (its a local VFD's water supply truck and the engine belt-driven junk hydraulic system we are replacing with this new diesel-powered one runs the huge hose reel...).
Suggestions on the best brand/type of low-P in-line pump to use? I'm not real keen on the 'Airtex specials' for an application this critical....
This is one of those 'good neighbor' jobs that we took on to help out one of the local VFDs...what a PITA its turned out to be. LOL..they better get to my house five minutes faster than before if I have a fire...
Suggestions on the best brand/type of low-P in-line pump to use? I'm not real keen on the 'Airtex specials' for an application this critical....
This is one of those 'good neighbor' jobs that we took on to help out one of the local VFDs...what a PITA its turned out to be. LOL..they better get to my house five minutes faster than before if I have a fire...
Posting Guru
Joined: Feb 2004
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From: Elverson, PA
This is the Carter pump that is popular for a "pre-pump" fuel pump
http://www.jegs.com/webapp/wcs/store...chItemId=32329
http://www.jegs.com/webapp/wcs/store...chItemId=32329
Fleet Owner
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From: Rio Rico, AZ.
BMC69 before you go and install that extra fuel tank, there is a third fuel line coming out of the top of the fuel sender on the top of the fuel tank on the F-550's. I use mine as the feed for the transfer from my auxiliary fuel tank. It terminates a few inches above the bottom of the tank. It would make a perfect fuel supply line for your setup as it would never use up all the fuel in the truck's main tank. The 18HP pump would run out of fuel at about the 1/4 tank level, leaving plenty of fuel for the truck to get to the station.
If you look at the top of the fuel sender you will find the main feed and return lines with hoses connected to them. There will be a third one that has a dummy plug on it to keep dirt out.
If you look at the top of the fuel sender you will find the main feed and return lines with hoses connected to them. There will be a third one that has a dummy plug on it to keep dirt out.
Fleet Owner
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From: Rio Rico, AZ.
Here's another picture. I've heavily modified my truck, the fuel pump is now inside the tank at the end of the fuel pickup. What I want you to see is the little tube that is held down with the band clamp around the body of the fuel pump. That is the end of the third tube that you can use to get fuel for your hydraulic pump. You can see that it terminates several inches above the floor of the tank and so will never run the truck out of fuel. It will run out first.
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Fleet Mechanic
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From: Northern Colorado
Originally Posted by Kwikkordead
......... there is a third fuel line coming out of the top of the fuel sender on the top of the fuel tank on the F-550's..............
didn't know that... Is that true of all the model years of the F-550's? I only ask because I notice that it appears that your sender is a bolt-on where the 350's have the funky plastic screw-on type that you have to beat off with a block of wood.FTE Stories
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Fleet Owner
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From: Rio Rico, AZ.
Originally Posted by guzzle92
didn't know that... Is that true of all the model years of the F-550's? I only ask because I notice that it appears that your sender is a bolt-on where the 350's have the funky plastic screw-on type that you have to beat off with a block of wood.
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Originally Posted by Kwikkordead
I honestly don't know the answer to that question. My guess would be that if it has the big metal 39 gallon tank mounted behind the rear axle, then it would have the triple connection, regardless of date of production.
Fire Chief was just by the shop to see where we were with regards to a solution. He wants his truck back....
I like the no-extry-pumps-required approach a lot better than adding one...I'll let ya know how this turns out. We should ahve that thing running today if all works out according to this new info. Or we'll stick the extry pump in and go that way..either way, thanks a lot fellas.
Fleet Owner
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From: Rio Rico, AZ.
Originally Posted by bmc69
The extry pickup is right where ya said it would be!...now I'm off to drop that mongo tank....(yuk)
Fleet Owner
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From: Rio Rico, AZ.
On second thought, why can't you just remove the dummy plug and attach the fuel line while the tank is installed? It's simply a quick connect that is removable via the little collar tool. If you can get your hand in there you can attach a fuel line and be done.
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Originally Posted by Kwikkordead
On second thought, why can't you just remove the dummy plug and attach the fuel line while the tank is installed? It's simply a quick connect that is removable via the little collar tool. If you can get your hand in there you can attach a fuel line and be done.
You should see how they managed to route an 8" pipe for the water suction side of the system through the pass-side wheel well to the go out the front of the truck...I'll try to post a couple pics when we have this thing out of the shop and in the sun again.