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vacuum fuel pump retrofit?

D

Don B.

Member
working on a repower here, on a rider mower. Replacing a blown 13hp Tecumseh OHV "Formula" engine with a 13hp Tecumseh "Enduro". The Formula engine had a hose barb threaded into the front of the block, where the Enduro has no fitting for a vacuum line anywhere.
I don't really want to drill and tap the block because i don't want to take it apart to flush out the filings. IS there anywhere else that I can put a fitting to run the fuel pump? I was thinking that I have seen some OHV's with such a fitting on the valve cover. That would be less work to remove so that I didn't get shavings inside the engine if that would be feasible/
or any other way/place on the engine that this would work?
 
If you have some talent and a good vacuum cleaner you can do that. You have a tap and dye set? Home type vacuum with a hose and crevis tool. Cordless drill with variable speed. Take a sharp bit and Very Slowly drill straigt in with the vacuum sucking as you go. Worst case you might get one or two tiny flakes inside. You are working with aluminum so it is soft. I have done stuff like this a couple of times. If you want....practice a couple of holes on something else first. That vacuum cleaner is a fantastic help. You really should have another person give you a hand with 5his job to keep that vacuum right on top.Be brave !!!!
 
One more thought. "That is when we really get into trouble". Does this engine have a OHV setup with a valve cover?. You could mount a nib fitting in the cover.
 
Briggs twins have had the fuel pump pulse hose in the valve cover for years. I have also seen their single cylinder engines with the pulse pump plumbed into the dipstick tube, but it had a special grommet molded to it for the hose.

One thing: Be sure there is a pretty good drain back hole for the valve area in the head to drain oil back to the sump. Kohler had some problems with their engines losing fuel delivery because the rather small drain back hole was filling with oil and then the pump connected to the valve cover was losing pulse. We had to drill one out with a 1/4" drill. The other mechanic did it and I am pretty sure he didn't take off the head-just an oil change and hope for the best.
 
yeah I wound up doing just as described with the vacuum while drilling, then used grease on the tap, put the fitting on the replacement engine,as close to where the old one was as I could "eyeball" The engine that I did this to still had its fill of oil, I drained it after drilling and tapping hoping to capture any leftover filings with the oil.... then took and dumped some lacquer thinner and shook the engine around and drained it, twice...
I went to ACE looking at their selection of hose barbs thinking of putting it into the valve cover. but as thin as that valve cover is (yes, OHV rocker arm cover) I couldn't find a compatible nut to go onto the inside of the valve cover to hold it in place...
would have had to be something with pipe thread....
 
Why not just install an electric fuel pump?

Be better and easier than drilling the block or head. Drill the wrong place and you run the risk of having oil spewing out of the hose and locking up the fuel pump instead of it creating the impulse crank pressure that is required to operate the pumps diaphragm.
 
because this is an engine swap for resale... don't want to spend the money on an electric when I have a good fuel pump already... I went ahead and drilled the block and tapped it as described lower in thread... grease on tap to hold shavings and then drained the oil and flushed w/ solvent before refilling with oil.

bought a fairly clean machine with bad engine, "just happen to have" an engine here that is same brand HP and crankshaft dimensions that I was tired of tripping on.
 
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