air in fue lines

[LandscapeMan]

hey Charlie the way the air is purged while running is either the air goes into the cylinders causing your surging or it is passed to the return line and sent back to the tank where it is let out the factory fittings have nothing to do with the ability to purge air but if not sealed it could cause a major air in fuel problem

Thank you for info on how the system self bleeds!

Charlie

 

[LandscapeMan]

Yep I like that one too. Funny is that we used the same pump to empty the tank yesterday and I did not come with that idea having it right there. Also it will prove if we connected it right.

Ezekiel,
It is actually a vacumn pump with a attached container typically used for bleeding brakes etc. I do have one and will bring it out to Marriottsville next time we get a chance to work on the blue beast.

Thanks again for all the help!!!
Charlie

 

[Exekiel69]

Both ideas are good and actually it may be better to use both. One to find out if the line is connected correctly (at this point we don't know since they where switch a few times) and the other to get rid of the air at once with out wasting more fuel.

 

[Agnem]

EZ/Charlie, stop messing around and put a Holley Red under there. That way, with only the pump running you will HEAR that it is sucking air, which I guarantee you is exactly what is happening. Probably one of the lines is either not clamped good, or has a pinhole in it somewhere. Then you can verify that the lines are bled at the schrader valve, and your troubles will be over.

 

[LandscapeMan]

EZ/Charlie, stop messing around and put a Holley Red under there. That way, with only the pump running you will HEAR that it is sucking air, which I guarantee you is exactly what is happening. Probably one of the lines is either not clamped good, or has a pinhole in it somewhere. Then you can verify that the lines are bled at the schrader valve, and your troubles will be over.

Hey Mel, King of the Diesel Gods

Thanks for the tips! Yea I guess it is time for the Holley Red. That would be a great help in finding if it is sucking air somewhere. Exekiel has a Holly Red on his truck. He can most likely advise me of the where and how to get one.

What does thow think Exekiel. Do you see a Holly Red in our future??

Thanks,
Charlie

 

[Exekiel69]

Hey Mel, King of the Diesel Gods

Thanks for the tips! Yea I guess it is time for the Holley Red. That would be a great help in finding if it is sucking air somewhere. Exekiel has a Holly Red on his truck. He can most likely advise me of the where and how to get one.

What does thow think Exekiel. Do you see a Holly Red in our future??

Thanks,
Charlie

Charlie, more than Happy to install one in the blue beast, I love the one on my truck .

 

[DeepRoots]

my only question is can you install a holley red and keep the mech pump? or do you have to do away with it?

 

[The Warden]

my only question is can you install a holley red and keep the mech pump? or do you have to do away with it?

You don't have to remove the mechanical pump from the engine, but you do have to bypass it if you have an electric pump installed. If you leave the mechanical pump hooked into the system with an electrical pump pressurizing the system, you could end up with a blown diapharagm and a crankcase full of diesel fuel

That said, I don't know how well the mechanical pump would do "dry"...if you're thinking on the lines of having the mechanical pump as a backup, I would suggest pulling it and putting in the block-off plate, and keeping it in the toolbox so you can re-install it if the electric pump fails. However, AFAIK, Holley pump failures are pretty rare...in fact, I don't think I've ever heard of one dying (at least not on this board)...

 

[dbarilow]

It’s an 8$ block off plate to get rid of the mechanical pump IIRC Chevy BB will work

 

[Exekiel69]

It is 5.44 at autozone last time I checked.

If anyone want to know...
Electric pump parts.
Holley "red" pump
3/8 or 1/4 fuel hose and fuel clamps
30 amp relay (no need to put all that amp but that is wath the had at napa)
10-15 amp fuse
wire in diff colors.
Chevy big block-off plate (must be Chromo)
Gasket maker.

I think that is all I used. Anyone else?

 

[hjalbert]

the guys at my autozone swore that a small blcok chevy and a big block chevy had the same block off plate, the one they sold me said small block chevy. It did not fit. So I cut off the lever that pumped the diaphram on the stock lift pump with a cutoff wheel, cleaned the pump out with carb cleaner, and reinstalled. Allthough I would like to know if the guys were smoking crack at AZ

 

[Full Monte]

Have you checked inside the tank for air leaks in the pickup tube?

 

[tonkadoctor]

Allthough I would like to know if the guys were smoking crack at AZ

I don't think they can afford crack at minimum wage, Prolly smokn bannana peels or sniffing spray paint in the back room.

Yes they are different. I don't like autozone at all and it's usually a waste of time for me to even go there.

Here's a link to JEGs on the block off plates so you can see the difference. http://www.jegs.com/webapp/wcs/stores/servlet/CategoryDisplay?storeId=10001&catalogId=10002&catalogIdentifier=Jegs_Direct&categoryId=13279&parentCategoryId=11501

 

[LandscapeMan]

Have you checked inside the tank for air leaks in the pickup tube?

Thank You!! No we have not checked that. We will check that this weekend.

A new piece of the puzzel. I drove the truck for the first time since we last worked on it. Using the front tank. There is still fuel leaking from the top of the rear tank. We have replaced the fuel lines and triple checked all connections. Any ideas on what might be causing the leak? Would that also attribute to the air in the lines? I don't have a good understanding of how the whole system functions.

My brand new Holley Red showed up yesterday. Original box with instructions and mounting hardware. I got if off evil Bay for $50. From a guy that bought it for a project and never used it.

Thanks for the help. And thank you Exekiel for all the help you have provided.

Charlie

 

[Full Monte]

Where the fuel is leaking may also be where you are getting air. The stock pump "pulls" fuel out of the tank. If there is a hole or crack anywhere, air can get into it, and it will. Vacuum pulls whatever is easiest, fuel or air. Since it has to lift the fuel out of the tank, it's easier to pull air in.