I've read some threads on the banjo bolt, but am still a little confused. Would someone be able to explain what the banjo bolt is, what it does, where it's found (pics would help). I understand there are actually two different banjo bolts? I've also read that a guy should carry a spare just in case?

Thanks in advance.

 

A "bano bolt" is a hollow bolt with passages in it for fluid to travel thru. Generaly used in fuel, and hydraulic systems to attach lines to tanks, injectors etc.
There are several styles and uses, but the places on our trucks you will find them are teh fuel injectors, IP and fuel filter housing.

this is a banjo bolt for a brake system:


The holes you see near the bolt head would be inside a hollow "bolt hole" in the line, allowing fluid to flow thru it.

 

This is an example of what the whole banjo fitting looks like.

Uses on our truck that I know of are for fuel delivery and boost pressure to the injection pump.

The ones you see advertised are the larger ones for fuel delivery.

-Steve

 

I can't think of a reason to carry a spare banjo bolt.

There are 3 banjo bolts on our trucks, and a couple parts that look like banjo bolts but aren't.

Two of the banjo bolts are on the fuel filter head, these are what you would replace with high flow ones if you wanted to do that (not a bad idea).

The third is smaller and connects the AFC cover to the boost tube.

On the back of the pump there's a fitting that looks like a banjo bolt, but it's actually the overflow restriction for the pump.

On the front of the pump is the pressure control valve, looks like a really weird banjo bolt.

 

those arent Banjo bolts on the fuel lines at teh injetors?

 

When bleeding the air or filling the new fuel filter using the lift pump isnt that a banjo nut that I use to bleed air out?



If I were to have an extra banjo nut I would have one for this nut in case I over tightened it... and very well may need one since I noticed something strange about the last time I used it.

 

I'd be willing to bet you have banjos at the front brake calipers as well.........

 

It is a good idea to have an assortment of the copper washers used to seal the banjo bolts.

They are easy to loose when you remove the bolts and being made out of copper they cannot be located or retrieved with a magnet.

And if you were to loose just ONE the entire system would be rendered inoperative.

And it will always be on a weekend.

 

Where might one get such an assortment of copper washers? Commonly available? Thanks...

 

When ordering the banjo bolts from Geno's, are we wanting the short or long bolts for our application on the filter header? Also, just to confirm, the banjo bolt on the filter discharge (the one that we use to bleed with) is the one that a person would use for a fuel pressure gauge tie-in right? The other banjo bolt that would require replacing with a "high flow" banjo would be the one on the inlet to the IP?

All replys have been helpful and informative. Thanks for the input guys.

 

Don't know about the long or short part, but the rest you got right. Athough, I kinda doubt the high-flow requirement comes into play until you are flowing alot of fuel putting down big numbers. Exactly how much maybe the big boys can tell.

 

The 'tapped' banjo on the filter block that we use for bleeding purposes has metric thread, so plumbing in NPT stuff for a FP gauge is out. The high-flow banjos for 24v's fit our trucks too. Get one that is tapped--it will be NPT. Toss the old ones in the toolbox or behind the seat for emergencys.

 

Yep, you're right. I missed those 6 little devils.

 

Where can I get the one for the AFC cover I broke mine and need one fast?

 

Cummins can get it for you. You can also replace the whole thing with Parker line (plastic tubing like truck air brake systems use) and NPT adapters. The head is 1/8" NPT, and a 1/16" NPT will work OK in the pump even though it's metric.