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  #1  
Old 06-18-2006, 10:13 PM
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BigRedChief BigRedChief is offline
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More TBI related inquiry...

Does anyone have extras, or know where I can get, the inlet and outlet fittings for the TBI unit? I have the fuel line repair kits with about 18" of fuel line, but I need the fittings that screw into the back of the throttle body itself. These are hard things to find... I've looked.

It looks like I have most of the connectors, but I am missing at least one. Does anyone know where I can get a connector for the knock sensor? I'm half tempted to run without the knock control at first just to see how it goes. I haven't even heard my engine knock yet (then again, my tires are loud and there's a lot of wind noise).

Last question (I hope...) is; has anyone experimented with some kind of surge tank for TBI since our fuel tanks are not baffled? I was thinking of using a large filter before the pump to act as a small reservoir that wouldn't slosh fuel around in high angle situations. Would it cause problems to have a pre-filter/reservoir and a post filter closer to the engine? Any other thoughts/ideas on this?
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  #2  
Old 06-18-2006, 10:24 PM
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Spectre Spectre is offline
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I'm using a large Jaguar XJ6 filter after the pump - haven't had any fuel starvation issues even at some extreme nose up or nose down angles - but then I've got a custom fuel pickup in the tank.
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Old 06-19-2006, 06:36 AM
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I got my inlet and outlets from Advance Auto in their HELP section. They were 4 or 5" pieces with the fitting and then a 90* bend in the middle.

As far as the knock sensor, it's not necessary and can be run without it. Also the knock sensor is designed for a GM engine and not the AMCs so it may pickup other sounds/harmonics or not pick up the right ones.

I know some people have used a large fram filter, either with the filter element inside, or gutted out or used surge tanks from VW Golfs. I'm not running one, but I usually don't let it get low on gas since the Waggy is a thirsty girl.
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Old 06-19-2006, 07:08 AM
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I seemed to remember seeing some fittings in the Summit catalog last week. I'm probably wrong on this but I think they are called "an" fittings. Just a guess.
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  #5  
Old 06-19-2006, 10:49 AM
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So far I haven't found the fittings I need in those Help sections. The best information I found so far for what I need is on an Advance Auto website for TBI conversions. It said they are a "metric, double-bump flare -hard to find later." I have the fuel line with fittings on the end that are for EFI (from the Help section), but they go into the fittings that screw into the TB. It is the set of fittings that screw into the throttle body itself that I need.

Another thing I think I'm missing... The intake air temperature sensor and connector. Is that a necessary item, or can I run without it? It seems like it would be a good idea, especially in AZ where I can encounter some extreme temperature changes. Any ideas where I could get the connector for that?

I have the Edelbrock multi-port EFI on my truck with no baffling in the tank and haven't had any starvation issues with that, but I'm concerned with the Jeep because I have had it in some near tippy situations. How's that custom pickup work Spectre?
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  #6  
Old 06-19-2006, 11:39 AM
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Very well. I took a stock GW fuel pickup, cut the return line out, had a 3/8" line brazed in, had it replated, then reinstalled the electrics for the fuel level sender. Then I adapted a fuel strainer from NAPA, attached it to the 3/8" line by hose in such a way that the strainer actually sits on the bottom of the tank, instead of hanging free about 1/4 of the way up like the stock one does. I can now use all 19 gallons in my tank, not just ~16 like everyone else.

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  #7  
Old 06-19-2006, 11:51 AM
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Pretty tricky! I don't know about going through all the trouble of brazing new line in and re-plating and such, but very cool anyway! I was thinking it would be cool to do something like they use for model airplanes. They use a weighted pick-up on the end of flexible line (called a "clunk") to "follow" the fuel in the tank. I think I'm just going to use the sender I have, but that's a good idea, extending the pick-up...
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  #8  
Old 06-19-2006, 01:17 PM
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Here's some fittings for you:

http://www.turbocity.com/default.php?cPath=16_24_52

Fourth and fifth ones down on the page.
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1975 Wagoneer DD
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  #9  
Old 06-19-2006, 01:35 PM
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Those are pretty cool looking fittings, unfortunately they're still not what I'm looking for. Those would go into the adapter fittings on the back of the TBI. Here's an example of what I'm looking for:



The threads on the TB are apparently metric and have a specific "double-bump flare" They allow the use of standard 3/8" and 5/16" EFI flare fittings.
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  #10  
Old 06-19-2006, 01:52 PM
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I think you best just getting them from the junkyard and getting new O-rings. Probably gonna costa bunch to buy them new...if you can find them. I could probably grap you one next time I'm at the yard, but probably cheaper if you just got them and don't worry about shipping anything.
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  #11  
Old 06-19-2006, 02:20 PM
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I haven't checked with a dealer yet. It was going to be my last resort if I couldn't find something aftermarket. Maybe I should though. They might surprise me and NOT empty my wallet for something like that...

It's a 7747 and I was scouring wiring diagrams after seeing mention of an intake air temp sensor, but didn't find one there. I guess that explains it!
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  #12  
Old 06-19-2006, 02:20 PM
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Quote:
Originally Posted by Nick1224
I think you best just getting them from the junkyard .

I may be back at the yard later in the week if you want me to snag you a pair.
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  #13  
Old 06-19-2006, 02:56 PM
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I'll take another look at a couple of parts places, but if somebody could grab a couple, that would be cool... I've got some kind of EFI repair kits, but they don't fit to the TB. Unfortunately I didn't test fit the one I already bent up (had the TB on the manifold before trying the fitting -Doh!). Now I'm wondering if there might be others that will fit to the TB. If I can't find anything else or can't find them through a dealer I found fittings to go from TB to -6 AN and then from -6 AN to 3/8" and 5/16" tubing on Summit's site, so I could make that work for ~$30.
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  #14  
Old 06-19-2006, 03:36 PM
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Quote:
Originally Posted by BigRedChief
Those are pretty cool looking fittings, unfortunately they're still not what I'm looking for. Those would go into the adapter fittings on the back of the TBI. Here's an example of what I'm looking for:



The threads on the TB are apparently metric and have a specific "double-bump flare" They allow the use of standard 3/8" and 5/16" EFI flare fittings.

Sorry, I thought those fittings took the place of the ones you are looking for.
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1975 Wagoneer DD
360 with large cap ecm controlled HEI, TBI EFI, Comp Cam 260H, Edelbrock Performer Intake, CS130 alt, 4 row radiator, S10 steering box, QT w/LO, WT 3.54 D44 axles. Rancho 9000X's, ~4" lift, Caddy rear discs.
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  #15  
Old 06-19-2006, 03:55 PM
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BigRedChief BigRedChief is offline
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Quote:
Originally Posted by pb
Sorry, I thought those fittings took the place of the ones you are looking for.

No problem... Those are cool anyway.

I've been searching around for a bit (should be working ) and I still haven't found the info I'm really looking for. The fittings are apparently 16x1.5mm (or 3/8" Saginaw) on the supply side and 14x1.5mm (or 5/16" Saginaw) on the return side. It's tempting to get the fittings that would convert it to AN since those are at least *less* hard to find.
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  #16  
Old 06-19-2006, 07:39 PM
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Those AN fitting adapters attach into the fittings you are lacking. They go from the saginaw style to AN:



They are extraordinarily hard to find and worth their weight in gold almost.
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  #17  
Old 06-19-2006, 07:42 PM
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Well... that sucks to know... How about the Trans-Dapt adapters for TBI's with spacers? Will those take the place of the ones I'm looking for? ('nother $30 part...)
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  #18  
Old 06-19-2006, 08:00 PM
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Here's what I've found that I was guessing might work:

Summit part

or

Trans-Dapt part
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  #19  
Old 06-19-2006, 08:10 PM
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The picture of the Summit part looks a lot like the Accel fittings I used in mine. I may just order a set to see how they fit. As you can see, those fittings on my manifold don't have a whole lot of room:





If that summit part replaces the factory adapters and the Accel fittings, I would have a lot more clearance.

I can always return them if they don't work.
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  #20  
Old 06-19-2006, 10:49 PM
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I'm really curious about the summit part since it seems like that's the right thing. I don't like losing out on shipping when I have to send wrong things back though. I think I'll be calling dealers tomorrow to see if I can get them that way. That's really strange to have a fitting that is so obscure! It almost makes me want to do something to change the thread to a regular pipe thread or do some other mod to make them more common.
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