#1  
Old 06-02-2019, 09:09 PM
frankyboy455 frankyboy455 is offline
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Default fuel pump advice

Don't come here often but my stepson's 68 Sprint Firebird is in need of a fuel pump and I do remember I bought a pair of NOS ones a few years ago and for the life of me, I just can't find them anymore.

Is there something available on the market beside finding a NOS one on ebay ? If I have no choice I'll go electric but I'd rather not.

Any help would be appreciated.

Frank.

  #2  
Old 06-02-2019, 09:26 PM
sprintbird sprintbird is offline
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I think the way to go is to get a fuel pump for a 250 Chevy and swap the arms. You may have to enlarge the mounting holes. Check the hole size.

  #3  
Old 06-02-2019, 09:58 PM
frankyboy455 frankyboy455 is offline
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Sounds like an ideal, I don't have the car with me right now as it's in storage but how involved is the arm swapping thing ? Any machine work required or is this something I can do here at home with regular tools ?

  #4  
Old 06-02-2019, 10:53 PM
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Bill Hanlon Bill Hanlon is offline
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I am far from a OHC Pontiac expert, but I went to my favorite place to look for this kind of stuff, RockAuto. When I looked up 68 Firebird with 250 CID engine all they had to offer was non stock electric pumps. But when I checked for the same engine in a '68 Lemans Rock auto had these three to offer (one is out of stock). Is there a difference between Lemans and Firebird pumps? GM part numbers listed are 6416502 and 6440616.

https://www.rockauto.com/en/catalog/...fuel+pump,6256

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  #5  
Old 06-03-2019, 06:53 AM
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Jeff Hamlin Jeff Hamlin is offline
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Exclamation FUEL PUMP WORK AROUND

No fuel pumps are currently available from anywhere except NOS & NORS on-line.
Some will say don't use an old (NOS) pump with today's fuels but I have always used them and my current pump has a few years of service on it. So what do we do?...

Option 1.
Find/Buy one of the bolt together type aftermarket pumps and upgrade/replace the diaphragm/gaskets with ethanol compatible products, this would likely require cutting/making your own out of sheet goods.

Option 2.
Use an NOS pump but keep an eye on it.

Option 3.
Use a block off plate and run an Electric pump with regulator.

Option 4.
Purchase a Chevy 4.1 pump which is close enough to stock PSI and preform an arm transplant and mounting hole Bushing.
This is IMO the BEST option and has been preformed and tested by several owners.
Below is an outline on whats needed to do this.

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Last edited by Jeff Hamlin; 02-25-2024 at 11:10 AM.
  #6  
Old 06-03-2019, 04:54 PM
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wayne228 wayne228 is offline
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I opted for option 3, I "hid" the pump by the sub frame & used a nice finned block off plate. The chance of fuel dumping into the oil & smoking the cam is just a chance I am not willing to take on my re-built engine.

  #7  
Old 06-03-2019, 07:07 PM
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Jeff Hamlin Jeff Hamlin is offline
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Had only one fail over the years, lucky caught it before any harm was done.
But once is more then enough.

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