[unruhjonny]

I was wondering if someone can help me out here.
I did several searches before posting this, and if there is a thread to answer my question, I must have not done the correct search terms.

I am interested in getting fuel pump to carburetor lines for my car, for both L74 & L78 engines.

I looked and our host's catalog only has one listing:
FN327 = 1970 & 1971

I thought that seemed odd, because I seemed to recall that there were two different fuel lines, and sure enough there is:



I then looked to compare our hosts catalog with the (obsolete) PY catalog, and compared that against the classic industries catalog;
I was astonished that CI, a company that does not specialize in Pontiacs, had two listings...



I have two questions:

1) what is the difference between the #480682* & #546481** fuel lines?

* = L74
** = L78

2) Can anyone give me a cross reference with for an OE part with the single one listed in he Ames catalog?

[Formulabruce]

I have used FN 327 on at least 5 cars. If It has a Quadrajet, AND the big can fuel pump for 70-71 , its a direct bolt up. If you use a 72 or even a 73 big can pump with the outlet moved, you can still bend it a bit easily to make it work down at the pump.
The fuel line difference should only be the bottom area, small pump vs big pump. A L65 will have a small pump, but a L74 will have a bigger pump. Both are 400 engines.

[Tellyshavilli]

Originally Posted by Formulabruce

I have used FN 327 on at least 5 cars. If It has a Quadrajet, AND the big can fuel pump for 70-71 , its a direct bolt up. If you use a 72 or even a 73 big can pump with the outlet moved, you can still bend it a bit easily to make it work down at the pump.
The fuel line difference should only be the bottom area, small pump vs big pump. A L65 will have a small pump, but a L74 will have a bigger pump. Both are 400 engines.

Where do u get FN327

[Formulabruce]

Originally Posted by Tellyshavilli

Where do u get FN327

Check out this , from F23 cat. which is current.

[unruhjonny]

Originally Posted by Formulabruce

I have used FN 327 on at least 5 cars. If It has a Quadrajet, AND the big can fuel pump for 70-71 , its a direct bolt up. If you use a 72 or even a 73 big can pump with the outlet moved, you can still bend it a bit easily to make it work down at the pump.
The fuel line difference should only be the bottom area, small pump vs big pump. A L65 will have a small pump, but a L74 will have a bigger pump. Both are 400 engines.

Bruce, first I thank you for replying, and giving useable information.

I consider you to be a lucky guy in that your car is pretty much all there, so you don't really have to sweat the small details;
As I see it, if I'm going great lengths to get a correct code & correct date range drivetrain, as well as correct exhaust manifolds, you had better believe that I really want to know the fuel line that I would be installing on said driveline is the correct style.

I did research this further last night;
It reads as though Inline Tube has revamped application for the two 1970-4bbl fuel lines, so instead of them appearing to have applications like this:

• GM #480682 = L74/L67
• GM #546481 = L78

ILT seem to be suggesting that the application goes like this:

• GM #480682 / ILT #PFE7003 = L67; fuel line goes to drivers side of thermostat housing
• GM #546481 / ILT #PFE7002 = L78/L74; fuel line goes to passengers side of thermostat housing

So it looks like (assuming ILT has details on the differences correct) that one of lines has the routing going to the left of the thermostat housing, while the other is going to the right of the thermostat housing.

I am confident that ILT is well intended, but I don't understand why they are asserting a different application for fuel lines than Pontiac literature.
I also cannot be certain that ILT has the routing correct according to my interpretation of the assembly manual listings.

So, as a means of deduction I have one question right now:

Do all Trans Am's (and L74 Formulas) have the fuel line routing to the passenger side of the thermostat housing?

[Formulabruce]

"Do all Trans Am's (and L74 Formulas) have the fuel line routing to the passenger side of the thermostat housing?"
They do. Considering their length, and alignment to the Q-jet filter housing, there is no other choice. The line is straight there.
My car is just original looking, to a degree. I wanted it all to fit and look original. "Factory Flavor"
I can say I run a 1978 Q-jet ( on purpose due to APT and crappy fuel) , and I have had the 72 and 78 carbs on the same car/fuel line.

[unruhjonny]

hmm... so I had a long response here that I am not posting.

Believe it or not, I do often spend time looking over resources I have access to, as well as googling for more information, and rechecking information I have...

I am now thinking that I have misinterpreted the assembly manual sheet 478275;

for fuel lines this is what I am reading as the full line code for line #480682;

480682 - PIPE 223 W/L67, L74, L86

Upon closer inspection (because I had missed this before) the "223" implies the Firebird (moreover all Firebird models);
This would suggest that this IS the fuel line used for Firebirds...
but I haven't a hot clue what RPO L86 is for.

This appears to be the only line addressing the Firebird models - which is really curious since the sheet seems to be more about the L30 engine (bottom of the sheet, right corner), yet the L30 (350/2bbl) & L65 (400/2bbl) engines appear to be missing from this page.

I was previously using the "L67" & "L74" RPO's for that fuel line, then the "W/L78" line from the part below it... but maybe those lines are for Bonnevilles(?).

Some of these lines are confusing...
It appears on one hand like text is wrapping down to the next line, yet on the other hands it seems to imply that there are three types of line starts:
1) model number followed by drivetrain options
2) no model number, but engine options
3) a four digit number starting with "6" followed by the engine option

Unless someone steps up to tell me that there is more than one fuel pump to carburetor line for either "226" or "228" models with any 400/4bbl, I will trust that the line offered by Ames is the only one used by all.

[unruhjonny]

ok... so the local pontiac guy gets his fuel lines from Inline Tube.

Their 1970 listings clearly say "bottom outlet" - have they goobered things up?



According to this, I want #PFE7002

I found two ebay inline tube resellers with listings that suggest that the Inline tube listings for their own catalog are actually wrong!?



So now it looks like I might want PFE7005 - which isn't even listed as a Firebird part - Please help!!

[Formulabruce]

FN327 installed on a 1970 455. PFE7002 is probably identical, But I cant verify. LOOK at where the line goes. this is considered the right side of the T stat. To go on the DS, it would need to go UNDER the hose due to air cleaner issues on a Firebird, and most likely a GTO.
I try Not to confuse an issue with too much info. We are lucky they make a pipe that is correct and works.
Ask your Local "Pontiac guy" . See which he runs. This isnt rocket science and originals , We could not order new fuel lines from pump to carb at the dealership. Delco did give us a big rack of straight tube and a nice bender though.

[unruhjonny]

huh - I did not know that you couldn't order replacement lines.

That looks to me like a 72-79 fuel line;
I have a nice original one of those...

between the confusing assembly sheet PY/Ames seeming to flip flop between two then one line, ILT seeming to have multiple listings for the same part, I was second guessing myself...

I made that last post immediately after placing an order for one from a local shop;
Then the shop owner pointed out the ILT description stating "bottom outlet pump" - I was worried I was ordering the wrong part...

Thanks.

[Held for Ransom]

I deal with The Right Stuff Detailing.

https://www.getdiscbrakes.com/parts/...es/fuel-lines/

Pictured:
Top is the later year unit.
Next was the old RAIII unit.
Then it's the 7021, that was the one for the RAIII.
Next is the 7020, 400-4bbl.
Last is the 7023, which I think is wrong for my 455 GTO.

Hard to believe a dealership couldn't order the line when they're listed in the parts catalog.

[unruhjonny]

@ HFR thank you very much for sharing this.
I sent off an inquiry to these guys.

I do have an ILT unit coming my way, but at the end of the day, I want to know that I have details correct - and I am going ot have a complete WT & RAIII engine setup for my car...

[TransAm 474]

So, from what I gather in this thread, the FN327 line from Ames is a direct fit for a 1970 Trans Am with a "YZ" RA III 400 using the factory style "big can" fuel pump? I was either looking at the FN327 or the Right Stuff 7021 for this application. Does anyone know what brand the line is that Ames sells as the FN327? Just want to be sure I get the correct line. Thanks