Oshawa65SS
Frequent Contributor
Posts: 1221
Age: 62
Loc: Grande Prairie AB & N...
Reg: 09-22-14
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03-16-23 11:11 AM - Post#2855856
https://www.chevelles.com/threads/sending-unit- gas...
My question exactly
Want to be sure it doesn't matter where the tab is clocked thanks
Ryan
65 Impala SS Evening Orchid convertible 283 2V, PG, 10 bolt 3.08 open by PO, originally 3.36
Build date Dec. 21 '64 Oshawa |
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 toro455
"7th Year" Silver Supporting Member
Posts: 945
Loc: Western NY
Reg: 06-15-02
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03-16-23 02:49 PM - Post#2855864
In response to Oshawa65SS
Ryan,
Just a guess but could it be something which helps the manufacturer remove the part from the mold? Possibly a place to inject from where they wouldn't need to worry about a trimming operation?
I don't see an obvious function in application.
I wonder if one of the manufacturer sites for sending units would list it as a common question? I know I've seen it before and probably on the sending unit I just documented for the '68 Impala EFI conversion. If that's where I remember it from I can tell you I did nothing special.
Scott
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Oshawa65SS
Frequent Contributor
Posts: 1221
Age: 62
Loc: Grande Prairie AB & N...
Reg: 09-22-14
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03-16-23 06:28 PM - Post#2855868
In response to toro455
Thanks Scott, what initially crossed my mind was that it was a mold take off.
I ended up setting the gasket at 12 o-clock simply because that was a convenient place to hold it as I pressed it in place after thinly applying 3M weatherstrip adhesive to it and the tank.
It wouldn't stay in it's recess in the tank otherwise.
It was easier to get the sending unit centered on the gasket and push down on the lock ring without being bothered by the gasket moving on the tank.
I don't have a lock ring tool, so I used a plastic coupling chamfered out to fit over the tabs to push the ring down evenly to get it started, and a hammer and brass drift to turn it the rest of the way.
I'll fill a jerry can tomorrow and check for leaks.
If there's an issue, a shop can deal with it because I can't do it any better than I already did.
This was all about replacing an aftermarket 130 ohm sending unit with an NOS 90 ohm unit.
Ryan
65 Impala SS Evening Orchid convertible 283 2V, PG, 10 bolt 3.08 open by PO, originally 3.36
Build date Dec. 21 '64 Oshawa |
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toro455
"7th Year" Silver Supporting Member
Posts: 945
Loc: Western NY
Reg: 06-15-02
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03-17-23 10:21 AM - Post#2855883
In response to Oshawa65SS
Ryan,
Good that you could find a NOS sending unit. I noticed that if Liland Global sells a sending unit for a car they are stainless. That's made their sending units my go-to.
I wish I could find a source for the special rivets which handle the ground strap to sender head. If those could be sourced, and the VR unit was the only issue, the VR unit only could be changed pretty easily. I wanted to remove it temporarily while brazing a pipe on a new sending unit. I guess I would need to look at the connections closer to see if the VR could be changed without disturbing the special rivet. I was only looking from the perspective of potential damage to the plastic insulator while brazing (I wet-ragged areas instead of removing it).
One other thing. I realize the sender isn't submerged in fuel but I would be careful assuming any sealant was gasoline compatible. I've not had an issue seating the seal. I use the brass drift solution as well. I try to contact as much surface of the tab as possible and then I give each tab a few taps before moving to the next. If you focus only on one the sender may want to shift off center but using a tab-by-tab approach normally keeps it centered.
Scott
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Oshawa65SS
Frequent Contributor
Posts: 1221
Age: 62
Loc: Grande Prairie AB & N...
Reg: 09-22-14
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03-18-23 07:11 PM - Post#2855907
In response to toro455
I have another NOS sender that had a sticky float lever so when I opened up the can I found the little spiral had broken off it's attachment point.
Could be repaired by someone who's good with silver soldering I would think.
There was only space to tap on 3 of the 4 lock ring tabs, but I got the ring is centered with all 3 stops seated which won't happen otherwise.
I run a little fuel filter there so I don't have to disturb that nightmare filter setup at the carb.
I don't know why they didn't have a piece of hose between instead of the hard line threading into the inlet fitting that threads into the carb.
Ryan
65 Impala SS Evening Orchid convertible 283 2V, PG, 10 bolt 3.08 open by PO, originally 3.36
Build date Dec. 21 '64 Oshawa |
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65_Impala
Very Senior Member
Posts: 4960
Reg: 12-29-02
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03-18-23 08:27 PM - Post#2855909
In response to Oshawa65SS
Fuel lines after the fuel pump have pressure in them. GM GM did not want a rubber line at the carb failing and dumping fuel onto a hot engine causing a fire. So, they made the pressurized side of the fuel system a hard line.
Many people who used plastic or glass filters and rubber lines under the hood have suffered engine fires or complete car loss because of leaks.
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Oshawa65SS
Frequent Contributor
Posts: 1221
Age: 62
Loc: Grande Prairie AB & N...
Reg: 09-22-14
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03-18-23 08:52 PM - Post#2855910
In response to 65_Impala
Interesting hypothesis, I never had an issue with the hard line to hose to filter on the Holley 4150 on my 69 Mach 1 I owned just a few months shy of 40 years.
Gave many years of hassle free filter changes
Ryan
65 Impala SS Evening Orchid convertible 283 2V, PG, 10 bolt 3.08 open by PO, originally 3.36
Build date Dec. 21 '64 Oshawa |
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toro455
"7th Year" Silver Supporting Member
Posts: 945
Loc: Western NY
Reg: 06-15-02
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03-19-23 09:39 AM - Post#2855921
In response to Oshawa65SS
Ryan,
I forgot that the 65 sender is on the front of the tank. I was assuming you were doing the job with the tank dropped down. My '68 sender is on the top so there's no chance of doing it without dropping the tank.
Is the finish on the underside of your trunk "Raptor"? Is it under the entire floor? How long has it been since it was applied and how is it holding up?
Scott
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65_Impala
Very Senior Member
Posts: 4960
Reg: 12-29-02
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03-19-23 12:52 PM - Post#2855928
In response to Oshawa65SS
Interesting hypothesis, I never had an issue with the hard line to hose to filter on the Holley 4150 on my 69 Mach 1 I owned just a few months shy of 40 years.
Gave many years of hassle free filter changes
You're still running a piece of original 40 year old hose under your hood????
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Oshawa65SS
Frequent Contributor
Posts: 1221
Age: 62
Loc: Grande Prairie AB & N...
Reg: 09-22-14
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03-19-23 02:58 PM - Post#2855935
In response to 65_Impala
Ha ha, no no, changed it with every filter with which a new chunk of hose and 2 clamps were included.
Ryan
65 Impala SS Evening Orchid convertible 283 2V, PG, 10 bolt 3.08 open by PO, originally 3.36
Build date Dec. 21 '64 Oshawa |
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Oshawa65SS
Frequent Contributor
Posts: 1221
Age: 62
Loc: Grande Prairie AB & N...
Reg: 09-22-14
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03-19-23 03:03 PM - Post#2855936
In response to toro455
I think it's POR 15 by the look of it.
I bought the car in 2014, and the guy I bought it from owned it since 2009, but didn't do the restoration.
I know who he bought it from, but I don't know if he did the restoration.
I only have receipts from the immediate previous owner, so I really don't know what's been done to the car and when.
Ryan
65 Impala SS Evening Orchid convertible 283 2V, PG, 10 bolt 3.08 open by PO, originally 3.36
Build date Dec. 21 '64 Oshawa |
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toro455
"7th Year" Silver Supporting Member
Posts: 945
Loc: Western NY
Reg: 06-15-02
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03-19-23 08:50 PM - Post#2855941
In response to Oshawa65SS
Ryan,
POR15 wets-out very well; to the point that you don't even see brush marks after brushing it on. The only way that's POR15 is if the surface was that irregular before it was applied. To me the surface is too perfectly irregular to be something like POR15. Raptor is like a bed liner coating which also seems to be popular for protecting under cars. It leaves a surface finish like your car has over even a perfectly smooth surface.
I think it looks very good. I only had a chance to see a live example of Raptor under a car about 2 weeks ago. I was hoping you had some longer term experience on it with a car which is obviously nice.
Scott
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Oshawa65SS
Frequent Contributor
Posts: 1221
Age: 62
Loc: Grande Prairie AB & N...
Reg: 09-22-14
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03-19-23 09:59 PM - Post#2855944
In response to toro455
Good point about the POR 15 Scott.
I don't know what it is, but it's hard and not rubbery like Rhino bed liner.
Is Raptor liner a harder coating then?
Doesn't seem thick either, under the sender ground wire somebody scratched to expose metal and the scratch is shallow as seen in the pic.
Needless damage when the fastener screws into the metal smh.
Ryan
65 Impala SS Evening Orchid convertible 283 2V, PG, 10 bolt 3.08 open by PO, originally 3.36
Build date Dec. 21 '64 Oshawa |
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toro455
"7th Year" Silver Supporting Member
Posts: 945
Loc: Western NY
Reg: 06-15-02
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03-20-23 07:16 PM - Post#2855983
In response to Oshawa65SS
Yes, hard and not particularly thick. I do suspect it's Raptor based on what I see and what you wrote.
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 DHMelton
Silver Supporting Member
Posts: 163
Loc: Central Arizona
Reg: 04-10-22
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03-21-23 03:28 PM - Post#2856003
In response to 65_Impala
Worse than pressured rubber fuel lines is copper tubing. I shudder when i see that going from fuel pump to carb, it work hardens from vibration and cracks.
If I have to use pressurized rubber fuel line on a carbed car, I use SAE J30R9 fuel injection hose. Its not cheap.
I do NOT use the J30R7 stuff usually sold in auto stores, yeah its cheap, but it for vapor recovery, not full time immersion.
Doug
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Oshawa65SS
Frequent Contributor
Posts: 1221
Age: 62
Loc: Grande Prairie AB & N...
Reg: 09-22-14
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03-21-23 04:54 PM - Post#2856005
In response to DHMelton
Funny you should mention copper, when that was what I replaced from the pump to the carb on my car.
I bought a stick with the fittings already on each end and bent it up to fit.
It's not touching the valve cover although it may look that way in the pic, I can slide corrugated cardboard underneath.
It's shaped like on 66 cars I believe, but I have an NOS 65 style hard line to install after I rebuild an original AC Delco pump.
Engine looks a lot different now than in that old pic.
Water pump is now rebuilt original without the top plug accommodation, fuel filter is gone, chrome oil cap is replaced with used original.
Ryan
65 Impala SS Evening Orchid convertible 283 2V, PG, 10 bolt 3.08 open by PO, originally 3.36
Build date Dec. 21 '64 Oshawa |
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