Simmy's Naked Turbo Project

I bench tested the pump with the filter in place, slight trickle of gas coming through.
I took the filter out of the hose and the pump just gushes.
Seems this little fuel filter was causing the issue, strange because it was allowing strong flow when I first assembled everything.
The petcock has a filter but I'd like something better in front of the pump.
I'll see what Canadian tire has. I'm sure glad I don't need a replacement pump.
And to the safety cops, yes this was stupid - potential sparks next to open fuel containers.

 

I wouldn't rule out the pump just on this alone. Bad pump will still move fluid when there is little/no restriction. You have the means to test PSI on the output side?

 

Yes I have a gauge. Is there any harm dead-ending it for a second?

 

I can't say for 100% certainty but I wouldn't think it would cause harm if done briefly for testing. Pump is already suspect anyway i.e. a known good filter should not reduce a pumps output like that. I assume the filter is not clogged?

 

It is somewhat common, at least in my experience in the automotive repair industry, to check a fuel pumps dead head pressure. Obviously you don't want to hold it there for very long but just check to see the maximum pressure said pump is capable of

 

@jayrodoh @Chitwood thanks guys, I'm going to see what the pump is capable of when I get home today.
Back on Page 19 of this build I did a pressure test and had the pump reaching 22 psi.
I agree with Jay, questioning the pump now, something has changed as it was pushing fuel through that filter before.
When I first had it running from my auxiliary Motion Pro fuel tank last fall I had the return line stuck into another gas can on the floor.
I had to change this to discharge back into the Motion Pro tank, otherwise it would empty the Motion Pro after 2 minutes of idling it flowed so much gas.
The pump is supposed to flow 130 LPH @ 15 psi so it should flush a full Seca gas tank through in about 10 minutes.
Very frustrating, when reviving an old machine you don't need problems from the new stuff bolted on.

 

If it pumps 150 l/s, and your not using that flow, where does it go? I assume a regulator and waste return?
How clean was your tank?
Normally pumps have strainers in front of them, not filters. If the pump is pushing into injectors the filter is before the injectors, after the return.

 

excess fuel just gets dumped back to the tank, see the schematic on page 22.
I dead-ended the fuel pump on the bench, see pic below, it actually decayed a bit, it was 60 psi


I took the filter out of the circuit and I'm back on the road. I went for a 30 km stretch and got into the boost a few times, ran without incident.

except I have a persistent oil drip from the oil connection at the turbo.
I tightened it up but that didn't fix it. I'll have to take it apart and see if the gasket is set right.

 

I hate oil leaks. And y'all know why.

 

Glad you figured it out, crazy that the filer is causing issues. Is it super fine mesh? Maybe it’s not rated for pressurized applications and is putting strain on the pump.

 

It's not meant for the suction side of a high flow pump. You can get inline strainers, usually the type you can clean, and this would be my choice. That filter would likely be fine on the inlet to the carbs.

 

The pump manufacturer actually offered a filter maybe strainer for the inlet as @Minimutly has suggested,
probably should have added it. This is the standard filter Chacal sells.

 

Which is a good filter. I have them on all my machines but I also don't have fuel pumps on any of them. A little digging into which type of filter or strainer is best for your application and you'll be set.

 

Boy is that a good looking bike...................

 

Right filter wrong application is all.

 

Yep, sometimes it's the simple things overlooked the most.
The weather is like summer here in Southern Ontario.
I introduced the Turbo to the stable today.
Here's my XJ collection.

Starting from the left, 911 Seca, 650 SecaT and FZ600
The shortest stroke is the 911 and the longest stroke is the 599.

 

The 911 seca - did you do a build thread for that?

 

That is a pretty herd Simmy. I am not big on green in general but you sure have made it look good. Well done! Makes me feel guilty about my very cheap, Midnight Maxim 750 rat bike. Don't tell Hogfiddles I said that......
John

 

not a build thread, just a discussion thread.
https://xjbikes.com/forums/threads/highly-modded-650-seca.85760/#post-505494
I've had this bike and sidecar since 1989 so I did all the mods before I was even aware of this forum.

Here's the thread I started for my FZ600. Nothing too exciting as bike is essentially stock
https://xjbikes.com/forums/threads/fz600-resto-the-hotrod-xj.99949/

Here's another thread I have in Other Bikes
https://xjbikes.com/forums/threads/a-real-scrambler.100460/
I have a very detailed build thread on the BSA Unit Singles forum but I think you need to sign in to view the pics
http://www.b50.org/phpBB2/viewtopic.php?f=14&t=4395