84 Fuel Pump Replacements are Wrong Size
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7th Gear
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84 Fuel Pump Replacements are Wrong Size
My 84 came with a 3/8" pump outlet, 3/8" fuel line, and 3/8" steel fuel line inside the fuel tank. I just purchased an AC Delco EP386 fuel pump. The pump has a 5/16" outlet and the 2" connecting fuel line is also 5/16". 5/16" fuel line will not fit a 3/8" steel line.
I then went to NAPA and looked at their 84 Corvette replacement pump, Delphi DFP FE0115, and it is also 5/16". On the Internet all the replacements look the same and I assume they are 5/16" also.
Has anybody got a solution for this problem?
Thanks,
Hwy120
I then went to NAPA and looked at their 84 Corvette replacement pump, Delphi DFP FE0115, and it is also 5/16". On the Internet all the replacements look the same and I assume they are 5/16" also.
Has anybody got a solution for this problem?
Thanks,
Hwy120
Team Owner
Joined: Sep 2003
Posts: 25,388
Likes: 2,741
My 84 came with a 3/8" pump outlet, 3/8" fuel line, and 3/8" steel fuel line inside the fuel tank. I just purchased an AC Delco EP386 fuel pump. The pump has a 5/16" outlet and the 2" connecting fuel line is also 5/16". 5/16" fuel line will not fit a 3/8" steel line.
I then went to NAPA and looked at their 84 Corvette replacement pump, Delphi DFP FE0115, and it is also 5/16". On the Internet all the replacements look the same and I assume they are 5/16" also.
Has anybody got a solution for this problem?
Thanks,
Hwy120
I then went to NAPA and looked at their 84 Corvette replacement pump, Delphi DFP FE0115, and it is also 5/16". On the Internet all the replacements look the same and I assume they are 5/16" also.
Has anybody got a solution for this problem?
Thanks,
Hwy120
I believe that someone would have to have cut the "nipple" from the fuel tank sender tree where the hose is intended to fit and then yes I believe you would have 3/8 steel tube that the 5/16 hose wouldn't fit. There would be no rational explanation for doing this on anything other than a modified car or was maybe at one time. Even the TPI cars with the pulsators had I believe a reduced size nipple for the pulsator to slip over. 5/16 I'm quite sure.
Look at the fuel tree in this document. There's several images of what any C4 tree except the ZR-1/LT5 should look like.
http://www.blowerworks.net/download/GSS340IG.pdf
Last edited by WVZR-1; Jun 13, 2015 at 08:30 PM.
Thread Starter
7th Gear
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This sounds like a "one of" - is there any identifying information on the pump that you removed? Post up some snapshots "confirming" what you just mentioned. I believe it very unlikely that you should/could have the situation you describe. Is this '84 stock?
I believe that someone would have to have cut the "nipple" from the fuel tank sender tree where the hose is intended to fit and then yes I believe you would have 3/8 steel tube that the 5/16 hose wouldn't fit. There would be no rational explanation for doing this on anything other than a modified car or was maybe at one time. Even the TPI cars with the pulsators had I believe a reduced size nipple for the pulsator to slip over. 5/16 I'm quite sure.
Look at the fuel tree in this document. There's several images of what any C4 tree except the ZR-1/LT5 should look like.
http://www.blowerworks.net/download/GSS340IG.pdf
I believe that someone would have to have cut the "nipple" from the fuel tank sender tree where the hose is intended to fit and then yes I believe you would have 3/8 steel tube that the 5/16 hose wouldn't fit. There would be no rational explanation for doing this on anything other than a modified car or was maybe at one time. Even the TPI cars with the pulsators had I believe a reduced size nipple for the pulsator to slip over. 5/16 I'm quite sure.
Look at the fuel tree in this document. There's several images of what any C4 tree except the ZR-1/LT5 should look like.
http://www.blowerworks.net/download/GSS340IG.pdf
Thanks,
Hwy120
Team Owner
Joined: Sep 2003
Posts: 25,388
Likes: 2,741
WVZR-1, I see what you are talking about in this document. However, I am the original owner, the car has 4,228 miles, the pump is/was the original. The pump has a straight 3/8 nipple and the tree is also 3/8. When the pump and tree are in place there is less than 1/2" between the pump and the tree. It did not have a pulsation damper as in this document, it had a rubber hose that disintegrated. This is a stock 84 with a Z51 suspension, no other performance codes. I can guarantee you that no one has modified the tree.
Thanks,
Hwy120
Thanks,
Hwy120
I've never seen anyone mention the "not being able" to do what you've mentioned and the part # I just referenced did the '82 CFI also - did many 4 cylinder and also some 6.0 Cadillac.
A Carter pump that should work is P60407 but Carter is a hard find these days.
Last edited by WVZR-1; Jun 13, 2015 at 09:43 PM.
Thread Starter
7th Gear
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Let's try this - at NAPA have them reference a GM# 6472120 which should cross for them to an Airtex E901 which will have a 3/8 outlet on the pump. 6472120 is the original '84 pump OR you can figure out how to adapt the later TBI pump you bought to the 3/8 sender tree.
I've never seen anyone mention the "not being able" to do what you've mentioned and the part # I just referenced did the '82 CFI also - did many 4 cylinder and also some 6.0 Cadillac.
A Carter pump that should work is P60407 but Carter is a hard find these days.
I've never seen anyone mention the "not being able" to do what you've mentioned and the part # I just referenced did the '82 CFI also - did many 4 cylinder and also some 6.0 Cadillac.
A Carter pump that should work is P60407 but Carter is a hard find these days.
Thank you for the help,
Hwy120
Burning Brakes
Joined: Apr 2009
Posts: 1,228
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From: That one city...you know that one. Idaho
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Thread Starter
7th Gear
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Thread Starter
7th Gear
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Thanks,
Hwy 120
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Thank you to everyone who replied.
For anybody with an 84 needing a replacement fuel pump look at the pictures of the pump. If it shows two brass terminals it is probably the correct replacement. If the picture shows a new electrical connector, then it has a 5/16" nipple and will not properly mate to the 3/8" steel drop pipe. However, other than the 5/16 vs 3/8 issue, both pumps physically fit.
Conclusion:
The ACDelco EP386 and Delphi FE0115 do NOT fit if you have a 3/8" drop pipe.
The AIRTEX E3901 and the Carter P60567 appear to be correct.
Thanks to all,
Hwy120
For anybody with an 84 needing a replacement fuel pump look at the pictures of the pump. If it shows two brass terminals it is probably the correct replacement. If the picture shows a new electrical connector, then it has a 5/16" nipple and will not properly mate to the 3/8" steel drop pipe. However, other than the 5/16 vs 3/8 issue, both pumps physically fit.
Conclusion:
The ACDelco EP386 and Delphi FE0115 do NOT fit if you have a 3/8" drop pipe.
The AIRTEX E3901 and the Carter P60567 appear to be correct.
Thanks to all,
Hwy120
Burning Brakes
Joined: Apr 2009
Posts: 1,228
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From: That one city...you know that one. Idaho
chevyowner, I don't know about the Delphi FE0114, but the Dephi FE0115 and the ACDelco EP381 are identical. I have had both in my hands. Those two are 5/16" and require an electrical connector to be spliced onto the two wires instead of using the original ring terminals.
Thanks,
Hwy 120
Thanks,
Hwy 120
It was just an example of NAPA's cross reference being wrong. IIRC NAPA also crosses an EP376 to the FE0114.
I'll have to write that down and hope I don't lose it.
When I was working on the fuel system in my swap I ran into that problem. I had 2 FE0114 (one was a warranty replacement) fail/die trying to provide 60psi for my LS swap.