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09-29-2023, 11:25 AM
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#1 |
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Registered User
Join Date: Jan 2013
Location: Paola, KS
Posts: 26
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Fuel pump install question - Fuel line too big
The fuel pump started leaking on the 307 in my 68 so I went and bought a new one. After it was installed I went to hook up the fuel line to the carb and realized the outlet on the pump is for a 5/16 line and not a 3/8. The fitting on the pump is not removeable. Would I be better off getting a different pump or is there some type of 5/16 to 3/8 hard fuel line adapter?
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09-29-2023, 11:32 AM
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#2 |
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Registered User
Join Date: Jul 2008
Location: Eastern Oregon
Posts: 2,392
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Re: Fuel pump install question - Fuel line too big
Easy mistake I would return it if possible and get the correct one.
__________________
71 C-20 07 Magnum RT AWD |
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09-29-2023, 12:47 PM
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#3 |
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Who Changed This?
 
Join Date: Jan 2013
Location: Simi Valley, CA
Posts: 10,708
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Re: Fuel pump install question - Fuel line too big
I'd expect the line to the carb to be 5/16" on a 307. Do you have a Q-Jet on the engine?
__________________
~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA |
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09-29-2023, 12:51 PM
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#4 |
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Registered User
Join Date: Jan 2013
Location: Paola, KS
Posts: 26
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Re: Fuel pump install question - Fuel line too big
It is a Rochester 2bbl. Maybe the fuel pump and lines were off of a 327? I'll see if I can find a part number on the old pump.
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09-29-2023, 02:11 PM
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#5 |
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Who Changed This?
Join Date: Jan 2013
Location: Simi Valley, CA
Posts: 10,708
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Re: Fuel pump install question - Fuel line too big
Not sure which 327s got 3/8" lines. Even 350s get 5/16" lines afaik.
__________________
~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA |
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09-29-2023, 03:17 PM
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#6 |
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Registered User
Join Date: Jul 2008
Location: Eastern Oregon
Posts: 2,392
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Re: Fuel pump install question - Fuel line too big
My 71 C/20 307 with TwoJet came with the 3/8th line. I bought a sending unit for it based on everything I read it was supposed to be 5/16th but tank line was 3/8th so back it went to Wes.
__________________
71 C-20 07 Magnum RT AWD |
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09-29-2023, 03:41 PM
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#7 |
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Who Changed This?
Join Date: Jan 2013
Location: Simi Valley, CA
Posts: 10,708
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Re: Fuel pump install question - Fuel line too big
Maybe air conditioning makes the difference? Grasping at straws, with that.
__________________
~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA |
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09-29-2023, 03:56 PM
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#8 |
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Registered User
Join Date: Jan 2013
Location: Paola, KS
Posts: 26
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Re: Fuel pump install question - Fuel line too big
I ordered a different pump and will check it out when it arrives tomorrow.
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09-29-2023, 06:43 PM
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#9 |
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Senior Member
Join Date: Jan 2010
Location: Here
Posts: 5,556
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Re: Fuel pump install question - Fuel line too big
I have a 67 327 truck auto with ac and I have a 5/16 line from tank to carb.
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10-02-2023, 12:23 AM
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#10 |
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Registered User
Join Date: Jan 2013
Location: Paola, KS
Posts: 26
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Re: Fuel pump install question - Fuel line too big
I ended up finding the right pump. I checked the number off the old AC fuel pump and cross referenced it at O'Reilys and they ordered me a Precision M16050. It was for a 68 327 according to their book. Anyway it is installed and the truck is running great. The truck will now be my official daily driver starting tomorrow.
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