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shakey doug · 09-05-2016, 05:49

HP pump requires a feed pressure of 3-5 psi to be efficient. 2.1 Ft of head = 1 psi.

Snowpetrel · 09-05-2016, 05:51

Thanks RC, sounds like you have a plan. Bypassing the fuel pump has to be worth a try. The less varibles the better. Good luck!

shakey doug · 09-05-2016, 05:54

The HP fuel pump requires 3-5 psi to be efficient. 2.1 Ft of head = 1psi

Rustic Charm · 09-05-2016, 06:03

Quote:

Originally Posted by Snowpetrel

Thanks RC, sounds like you have a plan. Bypassing the fuel pump has to be worth a try. The less varibles the better. Good luck!

I don't like the idea of bypassing it now. I think I'll just lean it and if necessary I'll repair it with a kit. Our caretaker at our yacht club, who seems to know a lot, thinks it needs it, or I'll struggle to bleed all the air out. Not sure why completely, but in any case I'll hold off by passing it. Clean and repair it.

Rustic Charm · 09-05-2016, 06:06

The other thing that might cause me some problems is putting the injector pumps back in. The injector technician measured the 'shim' on each pump and each in had the same. So he's given me a sheet of same size gasket to make shim's with. He believes it will get me going but not %100. And when he checked you can't purchase shim's for it anymore. So, I might have a little problem with that as well now.

Snowpetrel · 09-05-2016, 06:12

Quote:

Originally Posted by shakey doug

The HP fuel pump requires 3-5 psi to be efficient. 2.1 Ft of head = 1psi

Thats a handy tip. Cheers Doug, my old isuzu 3kr1 used to run (just) with no lift pump, but it probably wasnt efficient, and if the tank was low it wouldn't run. It would run from a jerrycan in the cockpit, with about a 1.5 ft head. So ideally I'd need to lift the tank up about six foot if ive got a pump issue. Good to know. Thanks!

shakey doug · 10-05-2016, 00:56

In line jerk pumps are not as sensitive as over 20 Hp individual pump unit jerk pumps.

Rustic Charm · 10-05-2016, 03:05

Well Shakey Doug, in your learned experience, does this look ok

Rustic Charm · 10-05-2016, 03:06

It took a little to open it. It was practically seized shut

Rustic Charm · 10-05-2016, 03:15

And after cleaning. I've ordered a kit to put in it though.

Snowpetrel · 10-05-2016, 04:08

Quote:

Originally Posted by shakey doug

In line jerk pumps are not as sensitive as over 20 Hp individual pump unit jerk pumps.

Thats useful to know. The 3kr1 had a bosch inline pump, as does my Nanni/kubota. This explains a lot. Thanks

Snowpetrel · 10-05-2016, 04:24

Quote:

Originally Posted by Rustic Charm

Well Shakey Doug, in your learned experience, does this look ok

Ha, yuck. Got to wonder how all that muck got through your racors! Good call Shakey Doug! Its great how much you can learn in a thread like this.

Rustic Charm · 10-05-2016, 04:30

Quote:

Originally Posted by Snowpetrel

Ha, yuck. Got to wonder how all that muck got through your racors! Good call Shakey Doug! Its great how much you can learn in a thread like this.

first thing I questioned.

thank goodness the engine has a primary filter.

I can't see how it could have gotten past the racor. Which makes me wonder if it had been collecting in there for years, long before I added the racor. It had a cav filter when I purchased it.