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#49650 08/28/2005 10:50 PM | Joined: Nov 2003 Posts: 70 New Guy | | New Guy Joined: Nov 2003 Posts: 70 | I have a 63 Suburban that had a 292 that I replaced with a 350. The problem I'm having is that the truck has 5/16 fuel line and the V8 is plumbed for 3/8 at the fuel pump. What is the best and safest way to make to make this work? I've talked to people that have done this engine swap, including one guy that has probably done 25 or 30 over the years, and they think I am making to big of a deal over this. "Take the 3/8 rubber line from the fuel pump, clamp it down on the 5/16 steel line from the gas tank and go" What have some of you guys done? I don't want to drop the tank if I don't have to. Thanks | | |
#49651 08/28/2005 11:31 PM | Joined: Oct 2003 Posts: 5,152 Cruising in the Passing Lane | | Cruising in the Passing Lane Joined: Oct 2003 Posts: 5,152 | I suppose if you're running at maximum power long enough the smaller fuel line could result in starving for fuel.
But I'm inclined to think its not a big deal. You could buy some brass fittings to adapt between 5/16 rubber and 3/8 rubber, but we're only talking about 1/16 difference and your clamp should be able to deal with that unless your hose is way too big in the first place.
1955 1st GMC Suburban | 1954 GMC 250 trailer puller project | 1954 GMC 250 Hydra-Matic | 1954 Chevy 3100 . 1947 Chevy COE | and more...
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#49652 08/28/2005 11:56 PM | Joined: Aug 2005 Posts: 157 Wrench Fetcher | | Wrench Fetcher Joined: Aug 2005 Posts: 157 | What I've done in similar cases is use a flaring tool to lightly flare the tubing. You can then slip the 3/8" rubber fuel line over and past the flared area and then clamp with 2 hose clamps. The flare acts kind of like a "safety stop" - there's no way that the fuel line can slip off. Don't clamp ON the flared end, clamp about 1/4" away from it. | | |
#49653 08/29/2005 2:06 AM | Joined: Mar 2004 Posts: 3,068 'Bolter | | 'Bolter Joined: Mar 2004 Posts: 3,068 | Get some new 5/16 fuel hose and fit it over the 3/8 fitting. It will stay tight even if the clamp loosens,
Scott | | |
#49654 08/29/2005 3:57 AM | Joined: Feb 2004 Posts: 29,746 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,746 | Trying to squeeze the 3/8" rubber line down onto the 5/16" steel line will probably result in an air leak at the fuel pump inlet. If you warm up the end of a piece of 5/16" rubber line in very hot water, it will soften and stretch enough to slip over the 3/8" fitting on the fuel pump, and the clamp will just be a redundant extra precaution.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
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#49655 08/29/2005 6:34 AM | Joined: Aug 2004 Posts: 90 Member | | Member Joined: Aug 2004 Posts: 90 | you could
solder a compression fitting onto your 5/16'' line and put the 3/8'' hose and hose clamp over it and nobody would know. it would all be hidden.
or
make the change at the fuel pump, one a 3/8'' and one a 5/16''.
or
as suggested buy a series of brass fittings and put that mess together and connect your hoses together. this seems like it may take three brass fittings and look wierd.
or
machine (if you have a lathe) a custom piece, or for that matter silver solder or braze a custom steel inline fitting.
gooday
jim
Gooday
Jim
small wheel moves by fire and rod,
big wheel fires by the grace of god,
everytime that wheel turns round,
bound to cover just a little more ground.
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