Anyone got the size and thread pitch on the fuel system banjo bolts? Are those metric or American?<br>I'm trying to gather all the pieces I need before I start pulling my lines off for replacement and I need to hunt down the elbow fittings to screw into the fuel filter.<br><br>Thanks,<br>Chris

 

you might give the guys at smokin diesel a jingle. I bought a high pressure system from them and all the braided stainless lines showed up at my doorstep precut to length and all the fittings in place. I asked if he could make this pump and line install idiot proof and he did.

 

Metric, They are. M12X1.5 I believe. I had to chase the threads on the one i got and that is what i uesd. Fit nicely now!

 

Mr 45,
Excellent! Thanks for the info. I was surprised the size had not been discussed here before, or at least a search could not find it for me. Now, metric brass fittings..... I guess that may end up being a challenge. I'll be at the parts store in the morning checking it out.

Thanks,
Chris

 

Question:<br>What size drill bit is used modify stock banjo bolts to oversize?? <br><br>--Justin

 

The larger ones, at least the ones I've seen have .187 holes in them (3/16). If you are planning to modify your own, note that some people have expressed concern about weakening the bolts too much by enlarging the stock bolts. I have no knowledge either way on this (I plan to eliminate mine altogether), I'm just passing on a warning.<br>If you get into it you might also index the bolts on re-installation as that may be of some help.<br>You might consider purchasing at least one, the one with the tapped hole in the top for the fuel pressure gauge.<br><br>Chris

 

Anyone know where to get, and what kind of fitting to use for banjo bolt replacement? ??? I know is it a 12mm, 1.5, straight thread, thanks to Mr 45, but I have been unable to locate them at the Napa or Lowes. It seems like no one has metric fittings.

Also, when I turn the key on the fuel pressure spikes to over 15 lbs (buries the needle), then drops back to zero rapidly while I am waiting for the heater to cycle off. Don't know that I expect and explanation here, just thought I'd mention it.

Thanks,
Chris

 

I lived near, King Bolt Co., Covina, CA (818) 914-2070. This is one of the most knowledgable men on nuts and bolts I have ever known. If he didn't have it in stock, very rare, he knew where you could get it. ???

 

Stamey, the fuel pressure jump and dive before starting is normal.....mine has done the same since I installed my guage.

 

<br><br>Stamey,<br><br>Not sure if this is what you're asking, but I used weber carburetor adapters on my truck. They're made by Aeroquip (or Earls) and can be bought through Summit, Jegs, or a local speed shop. In my VP44 and in the filter canister I used the M12X1.5 to -6 AN adapters. On my fuel line I ran -6 AN fittings on both ends of my SS fuel lines. Don't forget to put a compression washer on the weber adapter if you use these in your pump and filter housing. Here's a picture of what my fuel line coming into the pump looks like:<br><br><br><br>

 

Yup, that's about what I'm asking. I ran all over town today, about 100 miles worth, trying to hunt down 12mm x 1.50 adapters. I finally got some, but they only have 1/4 inch holes in them, only .062 larger than the oversized banjo bolts you can buy. My goal here is .375 (3/8) all the way to the injector pump. I certainly didn't think it would be this difficult. I'm trying to find the same thing you got from Summit but do not see anything metric listed, either in the catalog, or online.<br><br>If you have a packing slip from when you did yours please PM me some part numbers.<br><br>Thanks,<br>Chris<br><br><br>

 

Hey John!<br><br>The red elbow on the Aeroquip line, can you tell me what the ID is of that critter?<br><br>Rod

 

Ok guy's, here is a stupid question, what is the function of banjo bolts. I am actually embarrast to even ask. Mike

 

Stamey,<br><br>Yeah, I don't think those adapters are listed online, but Summit will have them. If you give them a call, tell them you're looking for an Aeroquip Weber carburetor adapter and tell them the size (-6 AN to M12X1.5). I think I threw away the little boxes they came in, but I'll check when I'm at home next time. I believe these fittings are about 3/8 ID, but I didn't measure. I can tell you that you're not going to get much bigger than those fittings though... the walls are pretty thin on them.<br><br>Rod,<br><br>I should have, but I didn't even measure the IDs when I put the lines on. That fitting is a standard Aeroquip -6AN 90 degree elbow, so I would assume that its ID is a pretty constant 3/8 through the bend. That sucker will flow some fuel <br><br>Mike,<br><br>The banjo bolts are just a way to get fuel flow from a fuel line into a port in a cylinder or pump. A banjo bolt has a hollow shank and passed the fuel through its body by radial holes cut into the body. It's an effective way to pass pressure (as used on almost all brake systems), but they don't handle high flow very well because the fluid has to snake its way through the bolts holes. <br><br>John

 

Mike,<br>Another more common use for banjo bolts is the the brake system. Look at your caliper, where the brake line contacts it. The bolt holding it on there is a banjo bolt. The brake fluid goes into the top of the bolt, through hole(s) drilled in the side, just under the head, and out the bottom of the bolt.<br>Same deal with the fuel system, when connecting to things like the fuel filter and the injector pump. <br>The difference is they didn't skimp on the brake banjo bolts. [undecided]<br><br>Chris