3B Primer pump leaking

[R2HKS]

Haven't started the BJ42 in over 3 months and when I went to start it yesterday to move it up the driveway to go on the flat bed it wouldn't start. I knew the fuel was low so I put 10L in and then cracked the nut on the fuel filter cracked open the factory primer pump and it would leak a lot of fuel whilst pumping.

I also noticed a lot of air bubbles coming out of the primer pump when pumping but it was squirting a steady stream of fuel out still. I couldn't get it to start in the end. Are you suppose to just loosen the bolt in the fuel filter or take it out completely?

I've read a few threads on replacing it with a 126 bosch primer pump but I don't like how they don't lock down when not in use. Has anyone tried to refurbish the factory pump with a new o-ring and a new copper washer?

EDIT:

I just asked our local diesel shop Maitland Diesel Services and they didn't recommend the bosch and only sold the high quality Zexel full steel body primer pump cost $40 AU

 

[lynchmob]

you can buy factory types on ebay from roodogs, but someone on this forum had trouble with one of those. I dont think there have been any problems with the bosch type. What is it you dont like about the lock down?

 

[lostmarbles]

....Are you suppose to just loosen the bolt in the fuel filter or take it out completely?...

I often remove the bleed screw completely to start with. (Till I start getting fuel out - if I have just changed the filter for instance.) Then I refit it for final bleeding.

.....I've read a few threads on replacing it with a 126 bosch primer pump but I don't like how they don't lock down when not in use. Has anyone tried to refurbish the factory pump with a new o-ring and a new copper washer?....

The OEM pump is designed as a "throw-away". (So is the Bosch.) IMO - it is not worthwhile attempting to repair either.

... What is it you dont like about the lock down?

x2

But I think I understand the distrust of a primer that can't lock down. Mainly because I used to feel that way too.

But if you think about it - your fear is completely unfounded.

With "lock down" you screw down the knob so it seals with a gasket-seal.

But with the Bosch, an internal spring achieves the same seal.

And you're not talking about high fuel pressures here. In fact - they are usually "below atmospheric"! So the Bosch sealing method is entirely adequate IMO.



PS. While I have heard one instance of an "apparently brand new Bosch primer" leaking - I think the design is actually less-prone to leaking than OEM. They are also smaller and much easier to fit/remove than OEM. (Require a smaller spanner-size and have a longer hex-portion on the body.)

 

[R2HKS]

When I asked MDS about the Bosch 126 his immediate reply was "We only sell high quality parts and only sell the Zexel full metal body lift pump".

I read your thread about the Bosch primer pump and also saw Tapage 126 leaked from new and it kinda put me off the Bosch but I was still willing to give it a go based on others results but the local guy didn't seem to regard the 126 as high quality.

Does the 126 have a plastic body?

 

[R2HKS]

On me not liking the idea of the Bosch 126 not being able to be locked down I thought that it might wear out a lot quicker flogging around up and down in the bush whereas if it could be locked down the only time it would wear was when it was in use.

 

[lostmarbles]

....Does the 126 have a plastic body?

The bit you hold and push up and down while priming is plastic - Yes

On me not liking the idea of the Bosch 126 not being able to be locked down I thought that it might wear out a lot quicker flogging around up and down in the bush whereas if it could be locked down the only time it would wear was when it was in use.

Both types are subjected to frictional-wear only while they are being manually pumped (during priming). No parts move within them during normal "driving around".

(But I think the leaking generally occurs from "time-based degradation of the seal material" rather than from frictional-wear.)



But "personal preference" is of course an important factor. So choose whatever you prefer and for whatever reason.

Zexel is a reputable brand - But strangely enough - I thought it was actually linked to Bosch. (Same company/conglomerate?)

 

[Stone]

I just installed a metal primer pump that I ordered from Roodogs through Ebay into my 12H-T...but I haven't tried it yet. Looks good, and looks beefy, but I did notice that under the sticker on the box it said "Made in Taiwan". How good it really is remains to be seen when I'm finally ready to fire up the 12H-T.

 

[beejay42]

My old primer pump leaked pretty bad, so I bought a new one from roodogs- it leaks a little less than the old one
But, at least it only leaks while pumping and particularly if less care is taken to keep the piston straight.
Works for me right now, as I have only had to use it once, but the next time I have to replace this part I will definitely be looking for something else.

 

[eleblanc]

On me not liking the idea of the Bosch 126 not being able to be locked down I thought that it might wear out a lot quicker flogging around up and down in the bush whereas if it could be locked down the only time it would wear was when it was in use.

Have you ever seen and played with one, the construction is totally different from the OEM. Someone really has to explain to me there theory as to why the bosch are not good???

Let me explain if you never seen one. There is a sleeve and a cap, both are seal together, inside there is a spring that simply apply pressure to the top, therefore there is absolutely nothing loose, and when you need to pump....well....you simply push and pump. I think it couldn't been any better!

The original pump is a POS. It will eventually jam, when screwed and after 15 minute of struggling to unscrew, it will leak terribly.

Get a bosch....

 

[lostmarbles]

I'll just add that the OEM primer fitted to my BJ40 by Toyota back in 1979 at least incorporated a proper plunger seal to stop diesel from leaking while you are priming. (Proper seals for such applications incorporate "wiping lips".)

Contrast this to the simple badly-fitting O-ring seal - as found in an unbranded Taiwanese-made OEM-lookalike (except for having a metal screw-down knob instead of a plastic one and therefore LOOKING even more solid and dependable than OEM) sold by an Aussi Ebay retailer - And it is obvious to me which is likely to leak on the first or second use.

I don't want to revisit this in detail because I copped a lot of criticism (for vendor bashing) last time I did that.

But having said this, if you've bought a screw-down type made by Zexel (or having their brand on it) - I'd expect THAT ONE to contain quality seals and work well for you.

And as I said before, I think Zexel and Bosch are effectively one-in-the-same brand anyway.

 

[R2HKS]

Someone really has to explain to me there theory as to why the bosch are not good???

I'll ask MDS today about the Bosch and see why they don't regard it as high quality when I pickup the Zexel. These guys do a lot of work for the mining industry so I would say that they don't like anything that's plastic if there is a metal equivalent.

Let me explain if you never seen one. There is a sleeve and a cap, both are seal together, inside there is a spring that simply apply pressure to the top, therefore there is absolutely nothing loose, and when you need to pump....well....you simply push and pump. I think it couldn't been any better!

I thought they may have moved around because they weren't locked down.

 

[R2HKS]

But having said this, if you've bought a screw-down type made by Zexel (or having their brand on it) - I'd expect THAT ONE to contain quality seals and work well for you.

I'm hoping it will be a quality piece of kit and won't leak, just about anything is better than the stock item.

 

[eleblanc]

I thought they may have moved around because they weren't locked down.

Impossible, you need to see one and use it to better understand.

 

[duckling]

I've been using the bosch for a few years and it really is a beaut. it really is well made and with a check valve instead of the stupid Toyota lock-it-down-before-you-lose-the-prime idea, bleeding is much much easier. Easier on the paws too. Toyota engines can't be beat, but some of the accessories are crap.

 

[Kroll]

Denso ones are still available as far as I know. Made entirely with the steel body.
One problem that I have encountered is installing them can be a hassle.

 

[BinaryDude]

Do you have a part number for the Denso? All i can track down locally is an OEM that the guy wants $75 for...

 

[Kroll]

If you're patient. I can find out this weekend, and post up on saturday.

 

[BinaryDude]

Sure, i can't drive the Troopy as it leaks a LOT of Diesel from the primer...

 

[lostmarbles]

I believe the Denso part number is 09219-50

 

[joshoisasleep]

the bosch is solid for me so far, seems to be a much better design for sure. Also, it looks way cooler. Which matters, obviously.