[Al Posts: 1008 Status: Offline WWW]

You've just given me an idea 

[Pat Tobin Posts: 107 Status: Offline]

Would you not just weld/braze a piece of 8mm tube onto the rocker cover and then use fuel hose to connect to the pump.


Pat

[Al Posts: 1008 Status: Offline WWW]

The problem with the vacuum pipe is that it has a flange on one end that fits into the rocker cover, so I cant just use a straight piece of pipe, unless I add an insert into the pipe that is already there & with how badly the original is perished, not a long term option.


I had an email back from a Briggs dealer yesterday asking if I wanted a formed or moulded pipe?  I've no idea what they were on about, so I sent them a picture of the pipe.  From the picture I would say it was a moulded pipe as it has a seam either side.


I've ordered a new pulse pump.


Postman realises I'm sorting a hovercraft again as his arms were full of parcels for me yesterday.  A lot more to come during the week 

[Steve Holland Posts: 1646 Status: Offline]

Not recommended, the max of 24" is from the bottom of the tank to the top of the float bowl. The distance isn't quite as important as the head dimension.

[Pat Tobin Posts: 107 Status: Offline]

I am running one of those ebay pumps and I think they said it was 4 psi. I have a T from it going to the Thrust (22hp Vanguard twin) and lift (12.5hp briggs). When running the lift on its own the thrust does not seem to mind the pressure. Thrust on its own is fine but the lift does not seem to like the pressure on the tiny carb as if i leave it too long it throws out white smoke for a bit and then starts. When both engines are running there does not seem to be any issue.


And a question about pulse pumps. Will a pulse pump work if the carb is 24 inches above the top of the tank and 4 foot away from it.


Thanks


Pat

[Steve Holland Posts: 1646 Status: Offline]

Good quality rubber reinforced fuel pipe will work, obviously better if you can get the original.

[Al Posts: 1008 Status: Offline WWW]

Just spent the last hour on the net trying to find the correct vacuum pipe :-/ 


I eventually found a page with the part numbers, but still no luck with finding the vacuum pipe.  waiting for replies now from a couple of Briggs parts suppliers.


Why don't Briggs make the straight bit of pipe the length of the longest one required so it can be cut to size, instead of having several lengths which do seem to be the same diameter.  Such a simple thing to do and probably work out cheaper for them to make one that fits lots of different engine

[Steve Holland Posts: 1646 Status: Offline]

I concur with Ian, you need the lower pressure pump if you're removing the pulse pump.
Cheaper to replace the pulse pump pressure hose with a silicon version though.
I used to carry a spare electric pump in case the pulse pump on the engine failed. I carry a spare pulse pump now by preference.

[Ian Brooks Posts: 3598 Status: Offline]

Theres a fair chance that'll overcome the float valve and flood the carb  1.5psi is where you're at, sadly 

[Al Posts: 1008 Status: Offline WWW]

Will this be too strong for a 26hp B&S professional engine?  I want to do away with the vacuum fuel pump on the engine and fit an electric one and wire it through the oil pressure switch, so it cuts out when the oil pressure drops/ engine not running.


 https://www.ebay.co.uk/itm/12V-ELECTRIC-UNIVERSAL-PETROL-DIESEL-FUEL-FUMP-FACET-POSI-FLOW-STYLE-CAR-VAN/262303735071?epid=2111635602&hash=item3d12855d1f:g:XbkAAOSwFNZWzC2X


I can get a facet pump that operates at 1.5 to 4 psi, but its 3 times the price


https://www.ebay.co.uk/itm/Facet-Electric-12v-Fuel-Pump-Low-Pressure-Kit-1-5-To-4-Psi-ADV/352082325395?epid=1825143836&hash=item51f9bdef93:g:xwwAAOSwnc1a1CnQ


At the end of the day, which is best suited for the job?



The vacuum pipe to the fuel pump is perished, so that would need replacing as I expect the original fuel pump, so thought probably a good idea to upgrade.