Fuel pump installation

[rmcdonal]

I am about to replace a mechanical fuel pump after a small leak was noted changing filters. Any tips or problems I should be aware of? Do you use a gasket sealer on the gasket & if so, what? Thanks.

Bob

[Dave Neptune]

Not sure?

Bob, are you talking about sealer on the "filter bowl" on the pump? If so you don't on the bowl. However you do need sealer where the pump mounts to the block and I strongly suggest permatex and not an RTV of any sort! The permatex (Av grd or #2) will stick to old and oily surfaces however the RTV's will seal but they do not stick to the oily surfaces and will eventually seep especially when used on the cooling system.
One mor thing no sealers on any of the pump gaskets just where it mate to the block, incase you are rebulding the pump. You should go ahead and redo it if you have it off anyway.

Dave Neptune

[Dave Neptune]

OOps!

Bob, sorry I just noticed that was your first post so welcome to the Afourian MMI forum!! You came to the right spot for anything A-4 related!

Fair winds _/) _/)
Dave Neptune

[rmcdonal]

Fuel pump installation

Thanks Dave. No, just putting a rebuilt pump on. I am still a little confused - do you mean Permatex to the gasket-pump interface and not to the gasket-block interface?

Bob

[sastanley]

Bob, welcome..that is up for hot debate..I'll let someone else comment on that. I don't recall if I used Permatex on the fuel pump gasket..however, the piston that comes thru the block is in the oil gallery, so it is probably a good idea.

One thing I always recommend for us mechanical fuel pump hold-outs , is to take the original regular bolts to the hardware store and replace with stainless allen head bolts. There is a lot of discussion about this all over the forum, but the "quick reason" is that the pump gets in the way and universals and extensions are bulky when re-installing the original hex bolts...the allen wrench will hold the bolt while you install the pump & fit around the pump housing.

[Dave Neptune]

Note

Bob, it is common for many to use permatex on just one side of the gasket for ease of future R&R episodes. Personally I use it on both side of any gasket because it is in a marine environment and for the most part once installed it does not come back off for quite a while.
To clarify use the Goo on the block to pump interface. Do not use it on the bowl to pump seal as it will cause problems in the future and can actually interfere with sealing.

Dave Neptune

[sastanley]

Since I now have a Racor 10 micron water separating filter and also the Moyer polishing filter, I did not bother with the little screen in the bowl this time when I rebuilt my spare pump..I think it likes to collect algae and stuff. The in-line filters seem to have rendered that little screen obsolete to me.

FYI - If you are looking for these parts, Moyer refers to it as the "sediment" bowl, which is probably a more technically correct term. I notice that if you buy 'just' the gasket, it appears to be rubber, but a cork one comes in the rebuild kit. I guess as fuel dumps into the bowl sediment hopefully drops to the bottom and only clean fuel rises to the top and gets sucked in the fuel pump diaphragm.