750 Sport fuel pump
- Maico88
- Posts: 73
- Joined: Sun Oct 05, 2008 1:32 am
- model: 750 Sport
- year: 1990
- Location: Georgia, USA
750 Sport fuel pump
I modified my 750 sport to run with no pump and found to much variation from full tank to empty tank. After some research I found an in-tank pump available from NAPA auto parts. The part # for the pump I got is NFP P74069 The pump produces 7 PSI. It fits very well in the stock bracket with the stock rubber grommet. The pump has a 1 year warrenty against defects and can be found at any NAPA parts store. The price was $61.99. I am going to try it without a pressure regulator. If the is a problem I will post it.
The top pump is the one that was in the tank and the bottom pump is the new pump.
The top pump is the one that was in the tank and the bottom pump is the new pump.
- ducinthebay
- paso grand pooh-bah
- Posts: 1323
- Joined: Sat Sep 03, 2005 12:00 am
- model: 750 Sport
- year: 1990
- Location: SF Bay Area
Re: 750 Sport fuel pump
Looks like as close to a match as you could expect. Nice work.
the 7 psi shouldn't be a problem, and its probably close to stock. A common modifcation with the stock carb was to put in a pressure regulator at 3 psi. If you are running Dellortos, or other carbs, then 7 psi will be more than enough.
Make sure you put a T in your fuel line before the carb(s) and run the other leg back up into the tank. There are two stub outs in the middle of the tank. One is the return from the T, the other is the vent line.
Keep us posted.
Cheers,
the 7 psi shouldn't be a problem, and its probably close to stock. A common modifcation with the stock carb was to put in a pressure regulator at 3 psi. If you are running Dellortos, or other carbs, then 7 psi will be more than enough.
Make sure you put a T in your fuel line before the carb(s) and run the other leg back up into the tank. There are two stub outs in the middle of the tank. One is the return from the T, the other is the vent line.
Keep us posted.
Cheers,
Duc in the Bay
1990 750 Sport x2-Rosso Blanko (900ss copy) & Nuovo Nudo (Scrambler project)
1991 907 -mostly stock
2002 ST4s - Lots of mods.
1990 750 Sport x2-Rosso Blanko (900ss copy) & Nuovo Nudo (Scrambler project)
1991 907 -mostly stock
2002 ST4s - Lots of mods.
- jcslocum
- paso grand pooh-bah
- Posts: 1714
- Joined: Mon Jul 19, 2004 12:00 am
- model: 750 Paso
- year: 1988
- Location: Eastern Shore, MD
- Contact:
Re: 750 Sport fuel pump
If you put the "T" in the line and use the return line then you will not need a regulator. This makes the system recirculate the excess fuel and won't allow the pressure to build in the carbs.
- Maico88
- Posts: 73
- Joined: Sun Oct 05, 2008 1:32 am
- model: 750 Sport
- year: 1990
- Location: Georgia, USA
Re: 750 Sport fuel pump
I do have a T in the line to return fuel to the tank, and so far no problems. Thanks for the info.
-
- Posts: 18
- Joined: Mon Jun 08, 2009 12:41 am
- model: 750 Sport
- year: 1990
- Location: Italy
Re: 750 Sport fuel pump
Hi!
Question on where to tie the T into the tank...
On the tank there are 2 stems
1 - Rifuito Cabur Waste Fuel
2 - Sfiato Breather Pipe
Which one do I hook the T into?
Thanks!
Carlo
Question on where to tie the T into the tank...
On the tank there are 2 stems
1 - Rifuito Cabur Waste Fuel
2 - Sfiato Breather Pipe
Which one do I hook the T into?
Thanks!
Carlo
- higgy
- paso grand pooh-bah
- Posts: 3328
- Joined: Tue Jul 29, 2008 9:50 pm
- model: 907 I.E.
- year: 1992
- Location: Hilltown,Pennsylvania
- Contact:
Re: 750 Sport fuel pump
1 - Rifuito Cabur Waste Fuel
Ducati,making mechanics out of riders since 1946
There's no problem so bad that a little fixing can't make it worse! : )
If it ain't broke keep fixin it till it is
88 750
90 906
92 907ie
There's no problem so bad that a little fixing can't make it worse! : )
If it ain't broke keep fixin it till it is
88 750
90 906
92 907ie
-
- Posts: 18
- Joined: Mon Jun 08, 2009 12:41 am
- model: 750 Sport
- year: 1990
- Location: Italy
Re: 750 Sport fuel pump
Yeah.... that's what I thought... still running rich
- jcslocum
- paso grand pooh-bah
- Posts: 1714
- Joined: Mon Jul 19, 2004 12:00 am
- model: 750 Paso
- year: 1988
- Location: Eastern Shore, MD
- Contact:
Re: 750 Sport fuel pump
Which carbs??carlopalmas wrote:Yeah.... that's what I thought... still running rich
-
- Posts: 18
- Joined: Mon Jun 08, 2009 12:41 am
- model: 750 Sport
- year: 1990
- Location: Italy
Re: 750 Sport fuel pump
It's the original weber carb. I installed a K&N air filter as well. Also decided to do away with the T and add the fuel pressure regulator.
You can see the new pressure regulator here
Didn't know what to do with the vacuum tubes on the carbs so I kept the old tubing and joined them... figured this was a better short term soltion than just leaving them open.
almost clear pic of the vent tubs at the bottom of the tank, need to run tubing for these in the next day or two.
The other toys in the pics are my 2004 VRod which I bought because of the amount of "down time" I was experiencing with the 750 and my wifes 2007 Sportster.
You can see the new pressure regulator here
Didn't know what to do with the vacuum tubes on the carbs so I kept the old tubing and joined them... figured this was a better short term soltion than just leaving them open.
almost clear pic of the vent tubs at the bottom of the tank, need to run tubing for these in the next day or two.
The other toys in the pics are my 2004 VRod which I bought because of the amount of "down time" I was experiencing with the 750 and my wifes 2007 Sportster.
- jcslocum
- paso grand pooh-bah
- Posts: 1714
- Joined: Mon Jul 19, 2004 12:00 am
- model: 750 Paso
- year: 1988
- Location: Eastern Shore, MD
- Contact:
Re: 750 Sport fuel pump
You can't leave the vacuum open or the bike will run poorly and very lean.
First, the Weber is not a very good carb to work with. Dellorto's are the best solution or adapting some Mikuni's off of a monster or ss.
Has the carb been rebuilt or fiddled with at all?? Do you know how to adjust it?
First, the Weber is not a very good carb to work with. Dellorto's are the best solution or adapting some Mikuni's off of a monster or ss.
Has the carb been rebuilt or fiddled with at all?? Do you know how to adjust it?
-
- Posts: 18
- Joined: Mon Jun 08, 2009 12:41 am
- model: 750 Sport
- year: 1990
- Location: Italy
Re: 750 Sport fuel pump
no idea how to adjust. i disassembled them last year and soaked, then gave to a shop where they also soaked... so they are clean but I think all the settings are gone. I was careful to measure number of turns etc with every screw... who knows what the shop did.
any idea how to adjust?
any idea how to adjust?
- Maico88
- Posts: 73
- Joined: Sun Oct 05, 2008 1:32 am
- model: 750 Sport
- year: 1990
- Location: Georgia, USA
Re: 750 Sport fuel pump
I posted a note about a NAPA replacement pump ( NFP P74069) in March of this year. At this time, I can no longer recommend this pump. The first pump I put in lasted about 5 weeks. NAPA replaced the pump at no charge. Unfortunately, the replacement pump failed last week. I have gone back to running the bike with no pump ( I have Dellortos). After readjusting the carbs, the bike is running well.
- higgy
- paso grand pooh-bah
- Posts: 3328
- Joined: Tue Jul 29, 2008 9:50 pm
- model: 907 I.E.
- year: 1992
- Location: Hilltown,Pennsylvania
- Contact:
Re: 750 Sport fuel pump
How much for the old weber?
Ducati,making mechanics out of riders since 1946
There's no problem so bad that a little fixing can't make it worse! : )
If it ain't broke keep fixin it till it is
88 750
90 906
92 907ie
There's no problem so bad that a little fixing can't make it worse! : )
If it ain't broke keep fixin it till it is
88 750
90 906
92 907ie
- Maico88
- Posts: 73
- Joined: Sun Oct 05, 2008 1:32 am
- model: 750 Sport
- year: 1990
- Location: Georgia, USA
Re: 750 Sport fuel pump
I don't have the weber that came on the Sports. It had dellortos when I bought it.
- ducinthebay
- paso grand pooh-bah
- Posts: 1323
- Joined: Sat Sep 03, 2005 12:00 am
- model: 750 Sport
- year: 1990
- Location: SF Bay Area
Re: 750 Sport fuel pump
higgy,
If you want an old weber, I have one in a box, complete with manifolds and air cleaner. I had once toyed with the idea of returning my bike to stock, but went entirely in the other direction.$75 plus shipping from California.
Cheers,
If you want an old weber, I have one in a box, complete with manifolds and air cleaner. I had once toyed with the idea of returning my bike to stock, but went entirely in the other direction.$75 plus shipping from California.
Cheers,
Duc in the Bay
1990 750 Sport x2-Rosso Blanko (900ss copy) & Nuovo Nudo (Scrambler project)
1991 907 -mostly stock
2002 ST4s - Lots of mods.
1990 750 Sport x2-Rosso Blanko (900ss copy) & Nuovo Nudo (Scrambler project)
1991 907 -mostly stock
2002 ST4s - Lots of mods.