I have an 84' Camaro Z28 NON-fuel injected. I'm lookikng for the fuel sending unit that goes in the tank. No-one seems to have this and mine is rotted out. any help?
also i'm looking for a torque arm bracket that bolts to the tailshaft of a 700-R4.

 

Whenever i was in trouble finding parts for mine, i always went to the junk yards. Mostly all the time i found what i needed. Did you check any junk yards near you yet?

 

When looking for a Fuel sending unit, keep this in mind.
1) all FI cars would have had an IN TANK pump.
2) the L69 cars from 1984 thru 1986 had an IN TANK pump & on Engine pump.
3) the LG4 cars in 1987 had an IN TANK pump & on Engine pump...

Therefore you need to find an 82-86 LG4, there pretty common as far as numbers go, but probably scarce in salvage yards... You may be able to modify another unit to work...

John

 

To Fire: Did you fix your problem?

To Okfoz: Doesn't the fuel injected LG4 require more fuel pressure than the L69? I am in the same boat ... My block mounted fuel pump has been replaced, and my rusty tank is leaking at the seams so I plan to replace the sending unit (rusty) and tank at the same time. Right now I can't find a fuel sending unit for any 82-84 f-bodys.

Thanks.

 

I got the tank from a guy in TX but... Hawks thirdgen has tanks and sending units. thats where i bought my sending unit, a little over 100 bucks...mabe less. they also had my bracket. and yes it fixed that problem than i swaped my intake and put headers on... now i'm too lazy to finish. good luck man. -matt

 

only differnce aside from the fuel lines is the L-69 in tank sending unit uses a shorter fuel pump and different wire connectors. to make a efi sending unit work just mount the L-69 pump and use a longer piece of hose from tha pump to the main feedline. Then just splice your original wires to the EFI sending unit and drop it in the tank, Then just cut the high pressure fuel fittings of and put some rugular fuel line on with clamps ..... end of problem

 

After offering one of these things to a guy a few months back & he too was concerned about it being rusty. Rust is just a way of life living in the northeast and if you drive your car on the road - it WILL get rusty. Anyway; He thought the $$ I was asking was a lot so I took some time to look on the web for a new one. I found just 1 place selling new replacments.......

Are you sitting down ???


http://www.paddockparts.com/Paddock/...96CA119FC739FD


I know it says for an 87 - but it's the only pump listed that is specified as being for a CARB engine only.

 

At that price I'm sure they will have it a long time. I used to think a new sending unit for my 82 vette was rediculously priced till I saw that LOL.

 

The LG4 was a carb car, the LB9, L98, & the Crossfire FI, and the V6 MPFI cars all use a higher output PUmp. I am not sure about the exact difference between the LG4 pump and the LO3 pump but I would imagine they were different as the LO3 was FI. However the LG4 also had an engine mounted pump. THe tank pump was more of a helper pump than anything on the LG4... Really I am not sure what would be different between the sending unit on the early cars and the later cars. I have an 83 TA parts car, the tank is still in it, I am not interested in dropping it though.

I would think that any good gastank shop should be able to fix you up with something.

John

 

Sorry, don't mean to hijack the thread. I'm new to third gens and would like to clarify my understanding. I have a carbed 84 Z28 L69. It has the mechanical fuel pump on the engine. Am I reading correctly in the above posts that it also has an electrical fuel pump in the tank? In the research I have done since acquiring the car last March, this is the first I have seen a reference to two pumps.

Thanks in advance for the clarification!

Mike

 

When I strip cars out the scrap yard wants the tanks removed from the shell. Since I'm forced to drop the tanks I always pull the sending units. I have stripped every type of ThirdGen Except for a Formula or any type of 350ci equipped car.

EVERY Carb motor car I have ever stripped ( even the early V6's ) have this type of "sending unit" or "pick-up" in the tank.




I have NEVER seen a tank mounted pump on a Carb equipped car. The electrical connections are ONLY for the fuel level gauge.

 

John,
It is more than likely that you have pulled only the non Fuel Pump (FP) type sending unit from 82-86 F-bodies. The only cars with the Mechanical & Electric FP were the L69 cars and the 1987 LG4.

Here is the List from the PArts & Illustration catalogs....

From the list you will see from 84 - 86 L69 & 87 LG4 they had an in-tank Fuel Pump. Also notice that in 1986 they had a relay for the LG4 (H) which I am not sure what it would do for a mechanical pump....


In short there were not a lot of 84-86 L69's and the LG4 in 1987 would not have been a large percentage of cars made... You are correct you probably had not rtemoved an in-tank FP from a carbed car... but there is the list, chances are you just have not run across one yet...

John

 

Lists are one thing and the real world is another. ( even much of that can't be believed, I can easily make nieve folks belive that the Third Gen roof console was factory in my 95 Z. ) If ANYONE can show me a pic of the 2 pumps from the same car; than I might believe it.

Take note - I am a pessamist ( in case it was not obvious ! )

It seems to me that installing 2 pumps on the same fuel output line would be not be cost effective and would only increase labor & equipment costs during production. Why use 2 pumps when 1 installed in either place would work without a problem and would eliminate wasted labor and expense on the assembly line.

NEVER say Never / Anything IS possible - I have learned that it's one of the first rules in the game of life. I'm not preaching the gospil or trying to proove people wrong or pick a fight. Simply debating this point !

Lists are great - but never as good as they were intended. Take this pump list for example: Notice that this list specifies engine code "7" ( the L69 ) to have used only an engine pump in 83. Then is specifies code "G" ( new L69 code ) from 84-86 as a blanket coverage for the production years - but then splits up each year to show it was also a "in tank" design. They list a in tank pump for the 86-87 "G" motor...... There were under 80 rumored to be made in 86 and none in 87. If they listed that part number than why not one for the 5.7 prototypes. And why is there a 5.7 ( Vin 8 ) fuel Pump listed for an "F" car in 85 ??

Lists are good - as a guide.

In my limited experience in the last 16 years of Third Gen Ownership - I have never seen a Carb car with an in tank fuel pump. Someone has to proove it to me before I can say, " I Learned something today ! "

P.S. okfoz I read these messages over once again after writing this reply..... It repeatedly sounds like your saying that both pumps were used on the same car and not that either pump could be used.... Is that correct ?

 

Yes my 87 had 2 pumps, one in the tank, one on the engine.

I have the original pump from my 87 in a tank in the back room. I would show you but it proves nothing as it could be from anything (being that your pessamistic) I know for a fact that I had 2 pumps, I had to install a block off plate for the Pump on the engine and I had to install the Sending unit from the TPI when I did the conversion... Fortunately I did not need to wire in the Fuel pump because the wires were already there.

THe purpose of the Dual pumps was two fold, 1) To aid in cold engine starts, Because the mechanical pump would not pump until the engine was cranking it takes slightly longer to start because the fuel tends to settle in the lines after the car has been sitting. With the addition of a low output in-tank pump cold starts are better. Another fact for you is my father has a 1969 Buick Riviera with 2 fuel pumps from the factory, one in the tank one on the engine...

2) It helped to eliminate cold vapor lock. One of the problems they had with the 1983 HO cars was in extreme cases the car would vapor lock. Since the fuel was being pulled from the tank to the pump in some cases the fuel pump would cause the fuel to boil, typically in warm conditions and when the fuel lines were close to the exhaust or in the warm engine bay. To resolve the issue a secondary helper pump was located in the fuel tank.

To be honest John I probably would not have believed it either if I did not find a FP in my 87 LG4 tank...

John

 

My 1984 L-69 trans am was bought brand new by me. It had the in-tank pump as well as a fuse for it in the fuse box. some 83's were recalled and the pumps put in them as well.

 

Look what I found ,........



Thanx Guys; Looks like " I learned something today ! "

 

Thanks everyone, good exchange of information. Being new to 3rd Gens and this site, I have to say I'm impressed with the expertise here. As John said, you learn something new everyday.

Mike

 

An additional question...If the in tank pump fails, it seems the mechanical pump should be sufficient to run the car. Would you agree? My experience would also lead me to believe use of a high performance aftermarket mechanical pump would allow removal of the in tank pump. Agree?

Thanks again,
Mike

 

I have a lot of questions ...

Which fuel tank should I use ... reproduction GM2721A or GM2721B in my L69 equipped Camaro?

Will a used sending unit be okay in my car?

Are there any parts on mine that I will NEED to carry over, i.e. float parts, wiring, washers, etc. Anything that wears or doesn't wear?

What manufacturer and part number will replace my original helper pump?

If I use a standard electric pump, will it send too much fuel to my other pump?

Does the helper pump shut off after the engine is running?

Because of my schedule I will buy all the parts and either the chevy dealer (works fast) or the shop next to my office (cheaper, but takes longer) will do the work for me so I have to ensure I have all the parts or they will keep my car in "shop jail" for a week or so (been there before).

You know what is funny, I already had the two pump discussion with Classic Industries, and their experts kept telling me I was wrong when I told them I had two pumps, but Advance Auto parts showed two in their computer, but they could only supply me with the block one on my engine (after it blew up - the diaphram leaked really bad). They are also the same people who are the only supplies for the driver side grill (82-84) and want $75 (3" x 4" plastic) for it.

 

During this past winter I had to carry a can of gas in the back seat to pour into the carb after both initial cold and hot starts ... I'm in west Texas now and haven't seen a winter yet, compared to living in up-state NY where the temps were between -20 and 20 when I had serious starting problems. I don't want to experience that crap again, no matter how cold/warm it is in TX. I like having my car start everytime I turn the key. A helper pump would be welcomed.
Thanks for your advice.

Does anyone know the difference between the GM2721A or GM2721B tanks besides one is for fuel injected cars/in tank pumps and the other is for carb/block mounted pumps? Will the "A" model for block mounted pumps work whether I have an in-tank L69 or not?

 

I'm not sure if this helps you or not; But I have removed the In-tank pumps from a tank ( MPFI and TPI ) and re-installed a regular carb sending in it's place and have not had a problem.

 

You could install a TBI tank pump that will provide plenty of pressure for a carb motor or a '85 TPI tank pump and use a 3 way regulator/gauge(one with return line).Possibly using a block off plate for the block pump unless you're restoring her.The sending unit it's better to use new if you can find so you due it once.

On the LH Z28 grill they are hard to find but watch Ebay,and the Classfied Section here,as they come often from time to time.I have the same problem with my '83 Z28.Same thing goes for the lower turn signal/marker as the RH is still available but the LH is spotty at best.

 

I don't think they ever truly resolved this problem. There were a number of TSBs and it sounded like all 83 and early 84 L69 cars were "recalled" and fitted with in-tank electric fuel pumps. I think there were even more TSBs through 85 where they installed carb heat shields/ spacers and then finally there was some kind of cooling fan/ duct kit with a timer that blew cold air over the carb whenever the engine was turned off. Eventually, GM stopped all fbody L69 production in 86.

My solution was to remove the WS6 cowl induction unit in summer and leave the scoop open the air so all the heat could escape. Mine was also sensitive to certain brands of gas in terms of vapor lock.

 

Yes, the car will run with just the mechanical pump. I have driven before with the electric pump fuse pulled and it didn't seem to make any difference.

Where you will notice it is if it is very hot outside and you shut the car off and try to restart it 5 mins later. Vapor lock will make the car difficult to drive for first few minutes until the carb fills back up with cooler gas. If it sits for an hour, no problem

 

I had always thought a TBI pump put out 10-13 psi while a L69 electric pump put out 4-6 psi

 

Okay, I didn't think it was important, because my main pump is on the block, and I thought this was normal until you guys replied, BUT ... On my fuse block the space marked for "fuel pump" does not have any electrical connectors for a fuse ... so does that mean mine is without the electrical fuel pump from the factory??? If so, what kind of sending unit can I use that will keep my car stock in appearance and function? (Which seems near impossible right now)
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On the PSI comment, I thought so too.
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On cars that did the TSB would GM have added a place for the fuse at the block or inline?

 

any updates?