Technical 350 chev mechanical pump issues

The timing chain slipped a gear

 

I have tried 2 different brands, onw was carter ir lasted 2 months but before hand i had a carter one for over 12 months. Could ir bw due to old stock sitting on thw shelf to long causing the diaphragm to go hard?

 

How does that cause the pump to leak?

 

*update*
It 100% has a mounting plate, the same one used on all 3 pumps ( 1st one lasted over 12 months) could it be old stock sittinf on the shelf too long causing the diaphragm to go hard?

 

Whoopty Do!!

Last stock replacement fuel pump I got from O'Reilly's for a Buick 455 cost a whopping $17.00.
Warranty doesn't cover the 1.0 Hours shop labor to R&R when it fails.

Old car replacement parts have gone to shit over the past 10 years or more!
They either fail premature or just plain don't fit.

When I buy the part, I have to stand by it, and fix it for free when it fails premature.

Its gotten to the point, that I will install customer supplied parts, sometimes its preferred, due to if its the typical piece of shit that's available now days and fails or I have to Re-engineer to fit because it won't fit out of the box, I don't have to eat the extra labor.

Sad sad state its become.

Bill

 

I was being facetious

 

Example:
Last Friday, A customer with a 1965 OT 6 Cyl. Car was recommended to me, for a transmission
leak, from another shop.
That shop just replaced the fuel pump and its leaking at the seam where its crimped together. He's taking it back there Monday. Its is not improperly installed.
So that shop will have to eat the labor and redo and hope the next replacement piece of shit, won't fail again.
Manufacturer of the part won't cover their labor.
Shop would have been money ahead to not even have fixed it in the first place.
I'm done venting.

Bill

 

Then the diaphragm failed. You got a bad pump.

 

If it hasn't been mentioned yet be sure to also check your oil. If the diaphragm has failed it may also be leaking fuel into the crankcase.

 

That's pretty much been SOP since the 50's AFA I know , it's painful if your the shop owner , it's. Inconvenient to the. DIYer , it is what it is .. how'd you like to replace , for free , all the new windows you put in a 2 story commercial building for $.50 on the labor dollar , lost $27k on that deal .

 

Bingo!...

 

Twice in a row sounds like bad luck

 

Yeah i will be dropping the oil 100%

 

Went through this and installed a carter street pump 6 years ago.all good

 

Yep, unfortunately. At least it's on the engine and not in the tank.

 

If an in-tank fuel pump leaks a little it doesn't matter, and you'll never even know it's leaking.

 

I had one that leaked at the crimp after it sat for a week or so. If driven more often, it was fine. I assume the diaphram shrunk from sitting and drying out. It went in the scrap barrel.

Gary

 

Replacing an in-tank pump because of some kind of failure was the point.

 

Yeah, some you have to take out the tank. Some have a little access cover under the back seat, thank you manufacturer!

But back to mechanical fuel pumps, I investigated one that failed on me a couple years ago and found this inside:



A plastic insert thingy with two umbrella seals, one of which was a bit wavy so no longer sealed against its seat. The plastic thingy itself was a bit saddle shaped as well.
Old ones used check valves with light springs and hard bakelite discs which did not readily deform.

 

Hey Harleyv89, I think as most people have already said, sounds like you been unlucky twice, and not all new pumps are that good anymore. I put a new pump on my 61 Belair over twenty years ago that I purchased from the local Repco store and it’s still going although the car has probably only done 18k miles in that time. I couldn’t recommend a good brand here in Australia at the moment but try and buy one from a good shop like American Suspension and Driveline in Victoria or Pontiworld in NSW and at least you’ll get some after sales support. Good Luck.
Mark.

 

Carter is the one the leaked within a week

 

Thanks mate, i went through outlaw speedshop in south Australia and got a quick fuel mechanical pump made by holly. I will put it in next weekend and see how it goes

 

Hey Harley,

Is the fuel pump tight up against something? I had a configuration where I thought I had enough clearance but when the motor revved it would slightly rock the fuel pump into a motor mount bolt. It was just enough to cause a crack that was extremely hard to see but it leaked. And it didn’t leak right off the bat, it took time to form a crack in the housing.

 

The new fuel won't help.
But too many new aftermarket pieces are crap.

 

Hi, I’ve bought some stuff from Outlaw, they are good too, don’t know why I didn’t mention them in my reply. Hope it works out. Just another question, what carb are you using? Only mention it cause if you are using an Edelbrock check to see what pressure that pump is putting out. Don’t want more that 5-6 psi with an Edelbrock carb, maybe 7 at most. Cheers,

 

Well being as Harley V89 is from Albury, NSW, Australia The concept of getting more than one pump that has been sitting on the shelf for a long time or a very long time isn't unreal nor is getting a real suspect pump.
The other thing with real old pumps is that the innards aren't compatible with the gas we get now if you are subject to the ethanal gas down there.

If the old pump that the car had before you started putting these suspect pumps on is one with the housing with the screws holding it together there are kits available to rebuild them yourself.

One last thing that may be an issue, IS the orientation of the inlet and outlet the same on the replacement pumps as it was on the original pump? Back when these engines were new it seemed that you had chassis specific fuel pumps often as not and now you get a one size is supposed to fit all pump.

 

Are you sure it’s not leaking at the fuel line? I had a new Carter pump recently where the threads were not cut deep enough, so the fuel line nut bottomed out. I “fixed” it by grinding the first two threads off the fuel line nut.

 

Are you not filing a labor claim to OReillys? I worked there for several years just for the extra cash for parts, plus rummaging the catalogue and back room until my heart's content (put together a wicked lift for my jeep using brake lines and other parts from all sorts of vehicles).

Anywho.... we had shops put in Labor claims all the time when a part failed prematurely (like minivan rack/pinions, lol). Oreillys definitely paid out for Labor claims to shops. I can't speak to how what percent it was or what rate it was because I didn't see the details, but I know my manager would get beat up over certain crummy designs that failed often (minivan rack and pinions, lol)..

-rick