So a couple of years ago, I got an oil leak. lots of oil in the valley, running back off the bell housing. Took it to Ford and they said it was the HPOP, specifically the non-serviceable plug, and the cost to replace the pump was $2,150. I couldn't afford that so I took the pump out myself, and yep, looked like that plug was loose and leaking and the threads were messed up as well. Got a longer thread plug from RiffRaff (and a bunch of other seals, gaskets, 0-rings and such) and repaired it. No Oil Leak! but a few months ago, maybe 6, it started dripping oil again, just a little at first, but getting worse each month. Oil in the valley again up front under the HPOP so I figured my "fix" had failed. Just got the pump out and there was some new oil on it but to me the "plug" looked dry. I couldn't see any indication of oil leaking at all. Only thing I can think of is the pump gasket leaked at the bottom but it feels ok (running my fingers along the rubber seal embedded into the metal gasket. The bolts holding the pump were tight as well. When I took the pump out before it clearly had a problem with "crud" all over the lower portion of the pump. This time no "crud" at all. It looked as clean as when I put it in a couple of years ago. Any suggestions on how to proceed?

 

How are the lines at the snap fittings? Those can become an issue. Corey at CNC Fab has a line replacement kit for very affordable money.

 

I guess you mean the quick disconnect fittings on top? No, nothing at all. Clearly visible before removing the pump and dry as a bone.

 

I can see nothing that looks like it's been leaking so that's why I was wondering if it could have been the bottom of the gasket. Maybe 6 months the leak has existed is not enough time for any buildup of sludge on the pump. Again, it looked totally clean with no building up at all. Clearly there was oil under it in the valley. nothing appears to be coming from the valve covers either.

 

Hmmmm, well I guess you could replace the gasket and go from there? They have been known to leak, though it's not very common. I had a line leaking at the head awhile back and it was puddling in the valley like it was the pump. That is why I asked about the lines. It's a mystery for sure.

 

Had(have again) in valley, thinking it was the non plug. Ordered kit, gotvpump out and sure enough, that plug was tight and clean. Ended up being the top plug positioned at 12 oclock that was loose. Now, from a quick inspection(8mon later), what BB mentioned, looks like it leaking where the line snaps onto fitting on d/s head..
Id put a crescent on each plug of hpoo to make sure none are a tad loose

 

And the o-rings on those plugs in the head are surely suspect. I have had one go on me and so have other members on here.

 

After I said i wanted to take the truck back, Ford would hardley talk to me as I asked for more details. But I noticed on the invoice it said "...leaking out the back oil pump cap." Would that be the approx 2.5" cap on the back of the pump" If so, is it repairable or just get a new pump?

 

IF...Memory serves, theres a snap ring and an oring..

 

Yes, there is a snap ring holding the cap on. But once removed, and the cap comes out, do the "guts" of the pump come out too?

 

So I get on RiffRaff's site and find they have an oring replacement for the rear cap but with the following caveat: " it's a very uncommon leak but it can happen. Before you order this o-ring, make sure that your leak does not originate from one of the discharge hoses, rear plug or non-serviceable plug and the oil has been pushed back to the snap ring lip from air flow over the HPOP." I also noticed the snap ring is almost fully in the groove on the bottom of the cap, and sticks out almost 1/8" on the top, like maybe not seated right, but it doesn't look like it is further out from the cap that the other side. Not that I don't trust the Ford diagnosis, but I don't want to try to repair something "that almost never fails" only to find out it wasn't that to start with. I am retired and don't have a lot of money, but I'm starting to think maybe it's better to just get a rebuilt pump like the T-500 or a Bosch. I read the RiffRaff reviews on the Bosch, only 2, and they were very bland. I read the 57 reviews on the T-500 and for the most part they were rave reviews claiming more power after the install. Can that really be true? Does the T-500 actually give you more torque and HP?

 

In short, avoid the T-500. Joey is very hard to get ahold of these days and his pumps have been subpar after years of stellar service. It used to be the go-to pump, but IMO, not any longer. CNC Fab is making a good pump at an affordable price. Corey is great and has great customer service. Also, maybe rebuild your HPOP with all new O-Rings from Bob at Diesel O-Rings. It's cheap enough and easy enough with the pump out of the truck. You may not need a new one, unless you just want to upgrade. Yes, a better pump will give a little more power and be better for your injectors.

 

Thanks for the info. What do you think of the Bosch?

 

Bosch is the original OEM pump.

 

What Bob said and I would have zero problem with a Bosch 17 degree pump. Good price and great pump. It's what is in my truck.