Fuel pump still leaking - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Andyboy · 04-06-2011, 10:57 PM

Well I replaced my leaky fuel pump but now where the hard line goes into the pump is still leaking. It tight but still leaks. Has anyone dealt with this problem? Getting frustrated and very smelly. HELP

oldblue1968chevy · 04-06-2011, 11:15 PM

Yeah, I went thru this, I cant remember how I got it to seal up. Is it a pre flared joint or did you do it?..

I just kept loosening, tightening and finally got it to seal, I even tried a new fuel pump and a new hard line!

Andyboy · 04-07-2011, 12:02 AM

It is pre-flared and its a new fuel pump and a new fitting. I'll try looseining and tightening again just sucks with that gas running down my arm.

**VetteVet** · 04-07-2011, 12:11 AM

Have you checked the line itself for a crack in the flare. I take it that it's on the carb side.

Rudy67chevy · 04-07-2011, 12:14 AM

Quote:

Originally Posted by Andyboy

It is pre-flared and its a new fuel pump and a new fitting. I'll try looseining and tightening again just sucks with that gas running down my arm.

Don't forget to disconnect the battery first

Andyboy · 04-07-2011, 12:24 AM

vettevet It leaked real bad with the hard line so I cut it and ran a rubber hose half way down to the fuel pump with a new 90 degree fitting, but still leaks but not as bad.

rudy thanks for warning.

cdowns · 04-07-2011, 05:43 AM

runnin the rubber line like that is a great way to burn the truck to the ground

68gmsee · 04-07-2011, 09:58 AM

As vettvet mentioned check real carefully for a hairline crack on the flare. I had one that did the same and the harder you tighten the more it opens the crack.

You have to look real carefully at the contact surface for the crack or an uneven contact sureface.

custom1970 · 04-07-2011, 10:20 AM

I'm not trying to be a wise %*#, but did you try wrapping the threads with an over abundance of teflon tape? I had same problem, also try and get it as dry as possible, gas has a tendency to "thin-out" teflon tape.

Andyboy · 04-07-2011, 12:09 PM

This might be a stupid question but how come some people don't like rubber hoses. I've seen alot of people use them and never had a problem. Just asking not being an a$$, just want to know.

cdowns · 04-07-2011, 01:36 PM

i state my opinion based on over 50 years playin with old cars and the bad results i've seen by shortcut guys using rubber fuel lines rather than going thru the effort to lean the skill to craft a bulletproof hardline

custom1970 · 04-07-2011, 01:53 PM

Quote:

Originally Posted by Andyboy

This might be a stupid question but how come some people don't like rubber hoses. I've seen alot of people use them and never had a problem. Just asking not being an a$$, just want to know.

Rubber fuel lines are disliked because eventually they will fail (leak) which obviously creates a huge fire risk. You'll find that a lot of people on this site are very anti-rubber fuel lines and others who have no problem with them.

dmack91 · 04-07-2011, 02:04 PM

Quote:

Originally Posted by custom1970

I'm not trying to be a wise %*#, but did you try wrapping the threads with an over abundance of teflon tape? I had same problem, also try and get it as dry as possible, gas has a tendency to "thin-out" teflon tape.

My understanding was that you weren't supposed to use teflon tape with flare fittings because the flare was supposed to be self-sealing- the threads only tighten the connection. Is that wrong?

Andyboy · 04-07-2011, 02:36 PM

Quote:

Originally Posted by dmack91

My understanding was that you weren't supposed to use teflon tape with flare fittings because the flare was supposed to be self-sealing- the threads only tighten the connection. Is that wrong?

You are right dmack

I just tried to loosen and tighten a couple of times and with no luck s__t is still leaking. So with my hand full of gas and smelling like a gas station I give up for now.

Andyboy · 04-08-2011, 09:22 PM

Ok I'm back and started fresh. Man sometimes you just have to walk away from things before you break something. Well I went and bought a pipe bender and pipe cutter and some hard line. Hardline is the way to go period. NO leaks and the bending part wasn't to bad at all. Did I tell you guys that it didn't leak anymore. Well thanks for all your help guys. Man I love this site.

chevytruckluver · 04-08-2011, 10:42 PM

When you want it done right.....(you know the rest) glad you got it!

Hubscrub · 04-08-2011, 11:13 PM

yea the looseing tighting thing worked for me after a few times

glad you got it and i agree HARD line is the only way minimal rubber looks better and hard line is super cheap too.

dmack91 · 04-09-2011, 12:02 AM

Glad it worked out for you.

mustardjimmy71 · 04-09-2011, 12:08 AM

On my friends truck we had the same problem comeing out the fuel pressure regulator. We tried teflon pipe dope and teflon tape. Still leaked. Then our millwright friend put on on a layer of dope, then tape, then more dope. The thing sealed!!!

cdowns · 04-09-2011, 07:52 AM

wont leak till all the crap disolves

using toilet technology on fuel system bad idea

andyboy glad you got if fixed no more leak and now you have cool tools that will always be there for you to do it right

04-06-2011, 10:57 PM	#1
Andyboy Registered User Join Date: May 2010 Location: Visalia, CA Posts: 376	Fuel pump still leaking Well I replaced my leaky fuel pump but now where the hard line goes into the pump is still leaking. It tight but still leaks. Has anyone dealt with this problem? Getting frustrated and very smelly. HELP

04-06-2011, 11:15 PM	#2
oldblue1968chevy Grandpa in the rustmobile... Join Date: Nov 2008 Location: Spokane WA/Viola TN Posts: 11,422	Re: Fuel pump still leaking Yeah, I went thru this, I cant remember how I got it to seal up. Is it a pre flared joint or did you do it?.. I just kept loosening, tightening and finally got it to seal, I even tried a new fuel pump and a new hard line! __________________ John Goose-1968 C10 355,9.32-1CR, Vortec Heads ,262 voodoo, 3.73:1 3OTT (HS ride/beater/farm truck) http://67-72chevytrucks.com/vboard/s...d.php?t=317684 Grams 53-1953 Chevrolet Belair http://67-72chevytrucks.com/vboard/s...=1#post4327784 1969 Chevy C10 Shortbed 4.5/6?" Frame off resto http://67-72chevytrucks.com/vboard/s...d.php?t=548136 1999 Toyota Tacoma 4x4

04-07-2011, 12:02 AM	#3
Andyboy Registered User Join Date: May 2010 Location: Visalia, CA Posts: 376	Re: Fuel pump still leaking It is pre-flared and its a new fuel pump and a new fitting. I'll try looseining and tightening again just sucks with that gas running down my arm.

04-07-2011, 12:11 AM	#4
VetteVet Msgt USAF Ret Join Date: Jan 2005 Location: Kalamazoo, Michigan Posts: 8,717	Re: Fuel pump still leaking Have you checked the line itself for a crack in the flare. I take it that it's on the carb side. __________________ VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative.

04-07-2011, 12:24 AM	#6
Andyboy Registered User Join Date: May 2010 Location: Visalia, CA Posts: 376	Re: Fuel pump still leaking vettevet It leaked real bad with the hard line so I cut it and ran a rubber hose half way down to the fuel pump with a new 90 degree fitting, but still leaks but not as bad. rudy thanks for warning.

04-07-2011, 05:43 AM	#7
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: Fuel pump still leaking runnin the rubber line like that is a great way to burn the truck to the ground __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

04-07-2011, 09:58 AM	#8
68gmsee Active Member Join Date: Jul 2007 Location: Centrally located between Houston, Austin and Waco. BCS area. Posts: 7,947	Re: Fuel pump still leaking As vettvet mentioned check real carefully for a hairline crack on the flare. I had one that did the same and the harder you tighten the more it opens the crack. You have to look real carefully at the contact surface for the crack or an uneven contact sureface.

04-07-2011, 10:20 AM	#9
custom1970 Member Join Date: Jan 2011 Location: Stuart, Florida Posts: 467	Re: Fuel pump still leaking I'm not trying to be a wise %*#, but did you try wrapping the threads with an over abundance of teflon tape? I had same problem, also try and get it as dry as possible, gas has a tendency to "thin-out" teflon tape.

04-07-2011, 12:09 PM	#10
Andyboy Registered User Join Date: May 2010 Location: Visalia, CA Posts: 376	Re: Fuel pump still leaking This might be a stupid question but how come some people don't like rubber hoses. I've seen alot of people use them and never had a problem. Just asking not being an a$$, just want to know.

04-07-2011, 01:36 PM	#11
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: Fuel pump still leaking i state my opinion based on over 50 years playin with old cars and the bad results i've seen by shortcut guys using rubber fuel lines rather than going thru the effort to lean the skill to craft a bulletproof hardline __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

04-08-2011, 09:22 PM	#15
Andyboy Registered User Join Date: May 2010 Location: Visalia, CA Posts: 376	Re: Fuel pump still leaking Ok I'm back and started fresh. Man sometimes you just have to walk away from things before you break something. Well I went and bought a pipe bender and pipe cutter and some hard line. Hardline is the way to go period. NO leaks and the bending part wasn't to bad at all. Did I tell you guys that it didn't leak anymore. Well thanks for all your help guys. Man I love this site.

04-08-2011, 10:42 PM	#16
chevytruckluver Eat, Sleep, Drive a Chevy Join Date: Apr 2010 Location: the town of the cow, Texas Posts: 1,152	Re: Fuel pump still leaking When you want it done right.....(you know the rest) glad you got it! __________________ Trey Silence may be Golden, but Duct Tape is Silver! 72 Short Step 57 "big window" short step

04-08-2011, 11:13 PM	#17
Hubscrub Cruzin Join Date: Dec 2009 Location: on the road Posts: 2,835	Re: Fuel pump still leaking yea the looseing tighting thing worked for me after a few times glad you got it and i agree HARD line is the only way minimal rubber looks better and hard line is super cheap too. __________________ Lime Wife's 67https://www.google.com/url?sa=t&rct=...wZEMODaS2d94u8 Back to the Fifties 59 https://www.google.com/url?sa=t&rct=...NAeStpydfrcj_U Proverbs 3:5,6 "Thanks to the Interstate Highway System, it is now possible to travel across the country from coast to coast without seeing anything."Charles Kuralt In memory of our first baby daughter, daddy and mommy love you. Danica Grace 6/26/14

04-09-2011, 12:02 AM	#18
dmack91 Registered User Join Date: Jan 2011 Location: Redmond, OR Posts: 760	Re: Fuel pump still leaking Glad it worked out for you. __________________ 68 Chev C20- son has it now 83 K20 - bought from son 70 C20 - in progress

04-09-2011, 12:08 AM	#19
mustardjimmy71 toys'r'us Join Date: Nov 2010 Location: Penticton, BC, Canada Posts: 347	Re: Fuel pump still leaking On my friends truck we had the same problem comeing out the fuel pressure regulator. We tried teflon pipe dope and teflon tape. Still leaked. Then our millwright friend put on on a layer of dope, then tape, then more dope. The thing sealed!!! __________________ 71 jimmy bone stock 350 sm465 33x12.5 rallies 79 caprice landau full load crate350 th350 lowered 20"wires 00 f150 reg cab sb 4x4 5.4L



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04-09-2011, 07:52 AM	#20
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: Fuel pump still leaking wont leak till all the crap disolves using toilet technology on fuel system bad idea andyboy glad you got if fixed no more leak and now you have cool tools that will always be there for you to do it right __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY Last edited by cdowns; 04-09-2011 at 08:00 AM.

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