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ZUKIWORLD Discussion Forum => Technical Discussion - Beginner / Repair => Topic started by: bobinyelm on June 11, 2017, 04:55:20 PM

Title: Oil Leak from Fuel Pump
Post by: bobinyelm on June 11, 2017, 04:55:20 PM
My old Zuk Sami fuel pump quit and I replaced it, but it has leaked at the gasket despite resealing it a couple of times when it should have easily have been sealed tight.

I'm talking ounces of oil, and not a few drops, either, and it runs down leaving a puddle under the car after shutdown. The old pump never leaked a single drop. I put dye in the oil and looked with a black light and found the stream coming down from the pump, and dripping off the bell housing (I originally feared a bad rear main seal).

I just re-pulled the new pump and it looks fine-no cracks in the casting or anything. Gasket looks like new.

I have another new one ready to go on, but wonder if there is a return oil passage for what oil runs down the pump activation rod that could be clogged that is building pressure behind the pump. I really don't see why the new one wouldn't leak like the last new one has been.

The engine only has a few hundred miles since a rebuild a few years back, and it is sludge/deposit free.

Anyone experience such a leak ever?
Title: Re: Oil Leak from Fuel Pump
Post by: fordem on June 11, 2017, 05:51:44 PM
Are you sure it's the gasket?  Those pumps have an internal seal and a drain pipe (looks like it should have a hose), and if the internal seal fails they dribble oil from the drain.
Title: Re: Oil Leak from Fuel Pump
Post by: bobinyelm on June 11, 2017, 07:11:22 PM

I think I may have found the problem-

What I thought previously was a shallow casting flaw is likely a through-crack that dripped when I filled the lower bowl with brake cleaner fluid.

I installed the new pump. I may have just gotten a bad pump-
We'll see.

(https://s11.postimg.org/atof7737j/photo_13.jpg) (https://postimg.org/image/atof7737j/)