Fuel pressure issue, very perplexed, need help

[ao.frog]

... schould not be installed on a FI-engine (correct me if I'm wrong guys), so do you have one installed? (I haven't seen that you've answered that question yet?)

Post pics: try this link: http://load.imageshack.us/

Click "browse", find the folder with your pics, select the size you want (I use the 17' monitor), click "upload now".

After the upload is done, copy the "forum-code" and paste it in your post.

Then you'll see the pics when you click "prewiew"... then send your post.

[taverroi]

No. I do not have a gascolator installed.

What is the "forum Code" you speak of?

Working on the posting picture thingy. Thanks for the help.

[taverroi]

Ok, hope this works for everybody interested. Here is the link to the fuel line routing photos on my bird. Any thoughts welcome.


http://imageshack.us/g/191/cimg0215g.jpg/


Other info. I cannot view post 18, 19 and 20 of this thread. Page 2 end with 17 and page 3 starts with 21? No idea whats going on there.

[taverroi]

ao.frog

Your the man!.

Will never have issues in the future for picture viewing.

Tango

[Bill Wightman]

Originally Posted by ao.frog

A gascolator ... schould not be installed on a FI-engine (correct me if I'm wrong guys)

There's really nothing "wrong" with installing a gascolator on a FI engine. Its just not necessary, as it is for carb'ed engines.

I ran a gascolator in my RV4 for almost 400 trouble free, fuel injected hours, just as a way of trapping water and heavy sedimentary stuff. Worked fine.

[ao.frog]

Tango:

"Forum-code" is the link I copy and paste to get the pic into my post. It's the forth one from the top under the "link to share your image" - page.
(the one you'll end up at when the uploading is done.)

You can use any of the other links too, but I prefer the "forum code" as it places the pics directly into the post in a good size (I select the 17" monitor size)

However, it's ofcourse up to you how you want to present your photos.

I've a couple of comments but I'm no engine-guru, so I hope others can correct me if I'm wrong.

The "silver-cylinder" with the drain-valve in this pic looks like a gascolator to me?





Is this the elec fuel-pump? (I've never seen one like this before)





Also: it looks as the fuel-lines going horizontally are somewhat close to the exhaust-tubes?

I think I've read somewhere that one schould avoid 90* connectors in the fuel and oil-lines as much as possible?

But as I said, I'm no guru, so I'm sure others will chime in with the correct info.

Good luck and please post updates regarding your engine-problem.

[Bavafa]

Originally Posted by taverroi

No. I do not have a gascolator installed.

Working on the posting picture thingy. Thanks for the help.

A couple of items noteworthy,
It does look like you have a gascolator installed (pix 5) unless I am mistaking it in the photo. Also, it is not clear in the same photo but it looks like that device (gascolator) is mounted directed to a AN fitting thru the firewall without itself being mounted on the firewall. If so, this can be dangerous as its weight is only supported by the AN fitting on one end and it could break the fitting by vibration.
Regarding the issue, I would suggest to try the easiest and cheapest way first. Adding a blast tube from the top of the engine baffle to the fuel pump is both very easy and cheap. It is also a good thing to have regardless. Next, I would check the fuel line in the tunnel to see if that is getting hot and creating the vapor. Perhaps you can fly one day with the cover removed which gives it both access to check for heating and/or a bit of cooling by not having the cover and more air circulating. If you have not checked it, it ought not be laying directly on the bottom skin. That fuel line typically is a hard line and not covered.

[Walt]

If it were me I'd do the following:

1) Get rid of the gascolator, install a filter in the cabin after the fuel selector.
2) Remove the firewall mounted aux fuel pump (weldon) and mount it or another style pump inside the cabin (away from the heat).
3) Reroute the cabn fuel line to exit in the center of the firewall (like it should be for a FI engine) so you have a short line to the engine fuel pump.

Basically bring the fuel system back to "original" design spec.
With both the gascolator and fuel pump FWF you have 2 major heat sinks boiling your fuel!

[aerhed]

Listen to Walt on this one.

[NDrv8r]

I agree with Walt.
The gascolator is not needed. The horizontal line off of the gascolator looks too close to the exhaust. If you get vapor in that line, then the fuel pump can't work. I would get rid of the gascolator, move to an andair or Vans electric pump and filter system that is in the cool cabin environment.

Also, I think most lines up to the engine fuel pump are 3/8. It looks like you have a 1/4 inch line off of the gascolator, and that going right accross the exhaust pipe. Could the lower fuel mass in the small line heat up quicker and cause the vapor?

It looks like you really have the lines insulated well. What insulation did you use and where did you get it?

I also have an IO 360 in my RV7a. Just moved it from the garage to the hangar about a week ago. Hope to fly soon.