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Tech Area => General Buick Tech => Topic started by: Scoobum on July 13 2018, 06:25:04 PM

Title: How Old Is Your Fuel Pump?
Post by: Scoobum on July 13 2018, 06:25:04 PM
Let's get a tally from everyone how old their fuel pump is. Mine is one year old. Let's hear from the rest of you guys.
Title: Re: How Old Is Your Fuel Pump?
Post by: Steve Wood on July 13 2018, 06:59:41 PM
It's really how many hours they have, I think. Mine or probably 5 years
Title: Re: How Old Is Your Fuel Pump?
Post by: daveismissing on July 13 2018, 07:15:38 PM
Original :)  And I believe it is about done at ...I, forget  160Km?

I was just yanking your chain Brad, tho I would hope a well made pump would live 5-6 years. Well now that I think about it the Rendezvous didn't make 3 years, but we could argue "well made".
Title: Re: How Old Is Your Fuel Pump?
Post by: daveismissing on July 13 2018, 07:17:39 PM
An hour meter would be interesting
Title: Re: How Old Is Your Fuel Pump?
Post by: Scoobum on July 13 2018, 07:30:30 PM
Original :)  And I believe it is about done at ...I, forget  160Km?

I was just yanking your chain Brad, tho I would hope a well made pump would live 5-6 years. Well now that I think about it the Rendezvous didn't make 3 years, but we could argue "well made".

No worries. This thread may wake people up. If I save them a pair of head gaskets, then I've done a good thing. It hasn't been any fun building this engine/changing it in this heat the past week and a half.
Title: Re: How Old Is Your Fuel Pump?
Post by: motorhead on July 13 2018, 09:25:09 PM
I bought my Buick with a pair of used Walbro 242s in it around 2001 and sold it with those same pumps in 2016.  Never changed a HG.  So... yeah... I guess they don't build 'em like they used to, eh? ;)

11 year old factory pump in the TBSS with a Boost-A-Pump slapped on it; still going at 219,000kms.  Damn thing only has the original in-tank filter protecting it too.

Wagon has a year on the Walbro 255 in it now... a 450 goes in when the supercharger goes on.
Title: Re: How Old Is Your Fuel Pump?
Post by: BoostedRPS on July 13 2018, 10:32:30 PM
My Weldon 2345A, before it was stolen, was almost 7yrs old.


Now that I'm starting all over, my fuel pump is brand new :D ...also cause we haven't decided if we are going to go 2345A or a mechanical Weldon pump, the 34712 which flows 12.5GPM (that is Gallons per MINUTE), ran off the back of my dry sump oil pump via a Waterman cable drive system.


If we go mechanical, I'll make sure to post up all the details and tons of pics!
Title: Re: How Old Is Your Fuel Pump?
Post by: good2win22 on July 13 2018, 10:32:35 PM
DW400 went in last Christmas season I think
Title: Re: How Old Is Your Fuel Pump?
Post by: Steve Wood on July 13 2018, 11:16:43 PM
I see they have an inline check valve available but I don't see any real reason to add one.  It might be a restriction to a slight degree and starting the pump slightly in advance should provide a very reasonable start.  Your initial video was not bad.
Title: Re: How Old Is Your Fuel Pump?
Post by: Top Speed on July 14 2018, 10:25:17 AM
Reminds me I need to change my filter even though I don't want to do it.
Title: Re: How Old Is Your Fuel Pump?
Post by: Forzfed on July 14 2018, 04:17:32 PM
Mine is 4.  I installed a 320 lph pump and then the car sat for 3 years with the motor out!
But I'm back baby!!!
Title: Re: How Old Is Your Fuel Pump?
Post by: nocooler on July 14 2018, 09:06:28 PM
Brad the racetronix 255hp I pulled out of the bird was 8 years old.
Title: Re: How Old Is Your Fuel Pump?
Post by: Forzfed on July 15 2018, 03:38:42 PM
DW400 went in last Christmas season I think
That is huge!  Did you have to increase the size of the fuel line?
Title: Re: How Old Is Your Fuel Pump?
Post by: good2win22 on July 16 2018, 02:26:02 PM
DW400 went in last Christmas season I think
That is huge!  Did you have to increase the size of the fuel line?
-6 feed and -8 return. Racetronix line kit
Title: Re: How Old Is Your Fuel Pump?
Post by: Scoobum on July 16 2018, 02:47:30 PM
I'm having a custom return line made up for my car.
Title: Re: How Old Is Your Fuel Pump?
Post by: BoostedRPS on July 16 2018, 11:45:13 PM
I'm having a custom return line made up for my car.

It'll be special with a little golden sticker that says "#1" on it.

Or it could be special in the sense it will be the very first official RPS return line kit, complete with adapter fittings for under the stock fuel pressure regulator and some worm gear clamps to secure the line to the sending unit :)
Title: Re: How Old Is Your Fuel Pump?
Post by: Steve Wood on July 17 2018, 08:34:10 AM
DW400 went in last Christmas season I think
That is huge!  Did you have to increase the size of the fuel line?
-6 feed and -8 return. Racetronix line kit

So you have, basically, a 3/8" supply line like the factory line, but you have a 1/2" return line?  I thought most went just the opposite...

Seems like retaining a 3/8's for delivery would put more load on a bigger pump.
Title: Re: How Old Is Your Fuel Pump?
Post by: Scoobum on July 17 2018, 08:58:32 AM
So I'll ask this question. How much HP can the stock feed line support?
Title: Re: How Old Is Your Fuel Pump?
Post by: good2win22 on July 17 2018, 09:05:24 AM
DW400 went in last Christmas season I think
That is huge!  Did you have to increase the size of the fuel line?
-6 feed and -8 return. Racetronix line kit

So you have, basically, a 3/8" supply line like the factory line, but you have a 1/2" return line?  I thought most went just the opposite...

Seems like retaining a 3/8's for delivery would put more load on a bigger pump.
I think I have those backwards. Installed on the car shortly after buying it 3 years ago. Am I supposed to remember?
Title: Re: How Old Is Your Fuel Pump?
Post by: Scoobum on July 17 2018, 09:32:41 AM
Grumpy...when you cracked the 9's...was it with stock fuel lines? I already know the RWHP it takes to hit the 9's with one of these cars weighing in about 3500ish on a 1.48 launch.
Title: Re: How Old Is Your Fuel Pump?
Post by: Forzfed on July 17 2018, 10:11:58 AM
He also used alky!
Title: Re: How Old Is Your Fuel Pump?
Post by: Scoobum on July 17 2018, 10:16:29 AM
He also used alky!

I cut my teeth with Grumpy. Stock junk...and Keep It Simple Stupid.
Title: Re: How Old Is Your Fuel Pump?
Post by: Forzfed on July 17 2018, 11:22:38 AM
Can't argue his success!  One day I hope he posts pictures of his old Cobra! :icon_lol:
Title: Re: How Old Is Your Fuel Pump?
Post by: Steve Wood on July 17 2018, 01:04:58 PM
So I'll ask this question. How much HP can the stock feed line support?

I'm going to say at least 600 to the rear tires..

A good pump will push the fuel thru the smaller line but it will pull a lot more current and the motor will get hotter which is not good for overall expected life span.

For the return side, the bigger pump will push a lot more fuel to the injectors than the engine can consume at low rpm so the return line then offers enough restriction that the pressure in the rail is raised beyond what the chip expects and the engine runs too rich.  Makes it hard to get smooth fueling.  A bigger return line allows the excess to be bled off stabilizing the pressure in the rail.

Dan was using twin nozzles on his alky system as I recall.  I forget what percentage of fueling the alky provides with twin nozzles, but he may have gotten 20-25% of his fuel from the alky which allowed his single walbro to keep up
Title: Re: How Old Is Your Fuel Pump?
Post by: WE4_Roller on July 29 2018, 09:56:22 PM
15 years on the daily driver,  and 28 years on the one I don't drive anymore.
Title: Re: How Old Is Your Fuel Pump?
Post by: BoostedRPS on August 01 2018, 09:11:37 PM
So I'll ask this question. How much HP can the stock feed line support?

I'm going to say at least 600 to the rear tires..

A good pump will push the fuel thru the smaller line but it will pull a lot more current and the motor will get hotter which is not good for overall expected life span.

For the return side, the bigger pump will push a lot more fuel to the injectors than the engine can consume at low rpm so the return line then offers enough restriction that the pressure in the rail is raised beyond what the chip expects and the engine runs too rich.  Makes it hard to get smooth fueling.  A bigger return line allows the excess to be bled off stabilizing the pressure in the rail.

Dan was using twin nozzles on his alky system as I recall.  I forget what percentage of fueling the alky provides with twin nozzles, but he may have gotten 20-25% of his fuel from the alky which allowed his single walbro to keep up


Your response is essentially the same response I just gave Brad, regarding the effects of adding a volt booster to a car and the resulting increased fuel flow from the fuel pump.


If the return line and fuel pressure regulator are free-flowing and have little-to-no restriction through them, then the engine should theoretically not have a fatter AFR. If the fuel regulator or the return line is not able to freely move the volume of flow provided by the pump, that fuel is now restricted in its' movement, and begins to "back up" as it experiences a flow restriction. The fuel becomes stuck in the fuel rail and needs a place to go. The more it is stuck in the fuel rail and increases the backpressure/flow restriction, the more pressure builds in the fuel rail.


High pressure fluid always wants to move to a low pressure environment, so when an injector opens up, providing a low pressure cavity/space for fuel to move through, the fuel that is backed up in the fuel rail tries its' best to make its' way into the injector and into the now low pressure space. Basically the fuel tries to force itself into the injector because it sees it as an available space to move to that has lower pressure and is not restrictive (unlike the fuel rail the fuel is currently in).


This reason is why I always suggest people upgrade their fuel rails. NOT because aftermarket fuel rails can flow anymore fuel than the stock fuel rail, but because the aftermarket fuel rails allow you to use much larger fuel pressure regulators, which can flow way more fuel through them! A new high-volume fuel pressure regulator and a new high flow return line will help prevent any backpressure / flow restrictions in the fuel system, which also will aid in the longevity of the fuel pump and help to provide a more accurate fuel system as a whole.
Title: Re: How Old Is Your Fuel Pump?
Post by: earlbrown on August 02 2018, 07:59:40 PM
So I'll ask this question. How much HP can the stock feed line support?


What fuel?  :D
Title: Re: How Old Is Your Fuel Pump?
Post by: motorhead on August 02 2018, 08:15:59 PM
So I'll ask this question. How much HP can the stock feed line support?


What fuel?  :D
Propane.
Title: Re: How Old Is Your Fuel Pump?
Post by: earlbrown on August 02 2018, 08:42:46 PM
(https://scontent-atl3-1.xx.fbcdn.net/v/t1.0-9/38265835_2575719265787281_8718332673673658368_n.jpg?_nc_cat=0&oh=facb401cf73bf8be3bda9f79cf300f5d&oe=5BD001E8)
Title: Re: How Old Is Your Fuel Pump?
Post by: TexasT on August 02 2018, 10:50:41 PM
I'll be in line for the propain not so much for the accessories .
Or at least I like the outfit..
Title: Re: How Old Is Your Fuel Pump?
Post by: BoostedRPS on August 03 2018, 03:06:46 PM
(https://scontent-atl3-1.xx.fbcdn.net/v/t1.0-9/38265835_2575719265787281_8718332673673658368_n.jpg?_nc_cat=0&oh=facb401cf73bf8be3bda9f79cf300f5d&oe=5BD001E8)




Do you watch the show "Tales from the Tour Bus" by Mike Judge? It is on Cinemax.


It is basically crazyass stories of old country music singers from back in the day that get told in animation form...Think of Drunk History, but in an animated form..


Anyway, Mike Judge said on one of the episodes that Hank Hill's mother on the show was played by country music star Tammy Wynette (Sp?) who was on a few episodes that they did about George Jones.


After watching that show, I firmly believe people underestimate how fucking crazy country people from the South are...the shit that they talk about on that shit is fucking ridiculous..


Like Jerry Lee Lewis owning a gun that Machine Gun Kelly owned, and shooting it off in the middle of the night after everyone was asleep since they had been on a 3/4-day bender. Since Jerry was the only person up, and he wanted company, he thought it'd be a good idea to shoot off the gun to wake people up. He ended up shooting up over $50k worth of dentures in the Dentist Office nextdoor to where he was staying.


Also...just about every major Country Music star from back in the day has shot someone. When I saw "shot someone" I mean they literally shot someone. I think George Jones was the only person who shot at someone multiple times, and missed.


That show is fucking ridiculous. Rap artists ain't got shit on old-school Country Music stars...
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