Fuel pump leaking
Thread Starter
Melting Slicks
Joined: Nov 2001
Posts: 2,659
Likes: 7
From: Katy (Houston) TX
CI 7-8 Veteran
Fuel pump leaking
I swear, if it's not one thing, it's another. While setting my idle I was checking for any leaks and sure enough, my mechanical fuel pump is leaking. It is a Holley mechanical fuel pump I bought about 3.5 yrs ago. I believe it's just the basic one, looks like this:
Well, I traced it down to the lower diaphragm thingy. I tried tightening the bottom bolt that holds it together but it's still leaking....pretty badly actually. It wasn't leaking before and this just suddenly started.
So what does this mean? Is the pump bad, or is there a fix for it? This is horrible timing cause I took off tomorrow so that I can take it in to have the exhaust work finished. :mad
Well, I traced it down to the lower diaphragm thingy. I tried tightening the bottom bolt that holds it together but it's still leaking....pretty badly actually. It wasn't leaking before and this just suddenly started.
So what does this mean? Is the pump bad, or is there a fix for it? This is horrible timing cause I took off tomorrow so that I can take it in to have the exhaust work finished. :mad
Melting Slicks
Joined: Jul 2002
Posts: 3,128
Likes: 3
From: Deltona (son of Deland and DAYTONA) FL
Re: Fuel pump leaking (tshort)
I JUST started a thread on stuff happening like this the other day. Don't you hate it when you have the parts to do a mod, then something breaks and you have to fix it? And I'm talking about something you can't improve with a mod like a headlight switch! :banghead:
My stock fuel pump leaked the same way and I just had to replace it. I don't know if your Holley one has a replaceable diaphragm.
I feel you pain.
My stock fuel pump leaked the same way and I just had to replace it. I don't know if your Holley one has a replaceable diaphragm.
I feel you pain.
Safety Car
Joined: Jun 2002
Posts: 4,844
Likes: 0
From: Pearland TX
St. Jude Contributor
Re: Fuel pump leaking (tshort)
Bummer Travis....
I had that same pump bolted to my new engine and dumped it on E-bay as Mark said I did not need it with the 355 he sold me. There's no return line and I would have had to run a fuel regulator. The problems with running a stock fuel pump to a 3/8" fuel line on a 750 carb? Finding a fitting that adapts from the fuel pump to that line.
How is the new engine running?
I had that same pump bolted to my new engine and dumped it on E-bay as Mark said I did not need it with the 355 he sold me. There's no return line and I would have had to run a fuel regulator. The problems with running a stock fuel pump to a 3/8" fuel line on a 750 carb? Finding a fitting that adapts from the fuel pump to that line.
How is the new engine running?
Thread Starter
Melting Slicks
Joined: Nov 2001
Posts: 2,659
Likes: 7
From: Katy (Houston) TX
CI 7-8 Veteran
Re: Fuel pump leaking (bgrice)
Well, it WAS running fine. It was actually idling quite nicely until I noticed the fuel leaking. Although, it does have a hesitation when I blip the throttle but I wasn't going to try to address that until the exhaust work was done. Now once again I have something else to fix/replace. :cry
Any other suggestions????
Any other suggestions????
Thread Starter
Melting Slicks
Joined: Nov 2001
Posts: 2,659
Likes: 7
From: Katy (Houston) TX
CI 7-8 Veteran
Re: Fuel pump leaking (REDSHARKONBOYDS)
my pump did the exact same thing..i tried tightening the bolts, and it didn't help.....i took it off and installed the stock pump back on.
Instructor
Joined: May 2002
Posts: 159
Likes: 0
From: Calgary Alberta
Re: Fuel pump leaking (tshort)
Not a 100 percent sure but I think Holley has replacement parts for most of their pumps. It's most likely the rubber diaphram you can see around the outer edge of the pump. You may want to check their website for more info. If the pump is only 3 years old..they may do it on warranty...Well....Maybe..
:D :steering:
:D :steering:
Instructor
Joined: May 2002
Posts: 159
Likes: 0
From: Calgary Alberta
Re: Fuel pump leaking (tshort)
That pump pushrod can be a challenge when you're trying to reinstall a pump.
A shop teacher showed me a trick years ago to minimize the frustration. Smear the rod with a little bearing grease and stuff it up in it's hole. It won't hurt a thing and will keep the rod up while you're trying to reinstall the pump..
Oh yea....really really tiny hands are a big help as well... :D :U
A shop teacher showed me a trick years ago to minimize the frustration. Smear the rod with a little bearing grease and stuff it up in it's hole. It won't hurt a thing and will keep the rod up while you're trying to reinstall the pump..
Oh yea....really really tiny hands are a big help as well... :D :U
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Thread Starter
Melting Slicks
Joined: Nov 2001
Posts: 2,659
Likes: 7
From: Katy (Houston) TX
CI 7-8 Veteran
Re: Fuel pump leaking (WhyFly)
....figures, Holley tech. staff is off until next Monday. :cuss :mad
Why can't things just work like they're supposed to?
I found the old pump and that won't work unless I feel like cutting off my AN fitting so it will slip over the barb fitting. I think I'll just take off that whole bottom section and take a look at it tomorrow morning. Maybe I will see something or be able to seal it better.
Why can't things just work like they're supposed to?
I found the old pump and that won't work unless I feel like cutting off my AN fitting so it will slip over the barb fitting. I think I'll just take off that whole bottom section and take a look at it tomorrow morning. Maybe I will see something or be able to seal it better.
Safety Car
Joined: Jun 2002
Posts: 4,844
Likes: 0
From: Pearland TX
St. Jude Contributor
Re: Fuel pump leaking (tshort)
Why can't things just work like they're supposed to?
I love long weekends.... 4 days off.
