Best Fuel pump for our GNs??

[BEATAV8]

Black Sunshine,
On a technical level, I see in your sig that you are running 42.5lb injectors. A double pumper would be massive overkill for those as you would be capable of delivering about +120gal/hr fuel rate, and only using a little over ~40 gal/hr at most. The return line would be flowing twice as much as you could use at the engine even when you were at 100% injector duty.

With those injectors you would be absolutely fine with a regular walbro pump and good solid electrical wiring.

 

[Black Sunshine]

Black Sunshine,
On a technical level, I see in your sig that you are running 42.5lb injectors. A double pumper would be massive overkill for those as you would be capable of delivering about +120gal/hr fuel rate, and only using a little over ~40 gal/hr at most. The return line would be flowing twice as much as you could use at the engine even when you were at 100% injector duty.

With those injectors you would be absolutely fine with a regular walbro pump and good solid electrical wiring.

Hello BEATAV8, I was considering buying the DP now to be nice and upgraded in that area of the car so I wouldn't have to buy anything else in that area again even after upgrading the car further. Like bigger injectors. There is a switch so I can use only one pump at a time so it's not overkill 100% of the time correct? If I felt froggy and wanted to use both pumps every once in awhile would the driveabality of the car be crap due to the smaller injectors and too much fuel going through the lines? Also this also kind of brings into play the option I was asking about earlier in this thread.

Racetronix, say I wanted to just save the money for now and go with your sending unit for a single pump and just have faith that the Walbro currently in the car will keep kicking. If I decide to go DP in the future whenever I do get around to getting bigger injectors do you sell the extra parts separate to convert one of your single pump senders into a double? I seen a couple pieces on your site, but I wasn't sure if that was everything needed.

 

[Racetronix]

Hello BEATAV8, I was considering buying the DP now to be nice and upgraded in that area of the car so I wouldn't have to buy anything else in that area again even after upgrading the car further. Like bigger injectors. There is a switch so I can use only one pump at a time so it's not overkill 100% of the time correct? If I felt froggy and wanted to use both pumps every once in awhile would the driveabality of the car be crap due to the smaller injectors and too much fuel going through the lines? Also this also kind of brings into play the option I was asking about earlier in this thread.

Racetronix, say I wanted to just save the money for now and go with your sending unit for a single pump and just have faith that the Walbro currently in the car will keep kicking. If I decide to go DP in the future whenever I do get around to getting bigger injectors do you sell the extra parts separate to convert one of your single pump senders into a double? I seen a couple pieces on your site, but I wasn't sure if that was everything needed.

We sell complete DP systems or kits to convert factory G75/G77 senders. At some point we are going to discontinue the DIY kits b/c the majority of factory senders are deteriorated to the point where they will no longer reliably support DP conversions.

We do not sell kits to convert our single senders b/c they are different from our DP senders.

 

[TURBOPOWERED68]

These guys are right about buying what you need.
That said, if money is not a problem.
I would go as big as you can go with out hurting your current performance. For example i just purchased a new single fuel sender = big mistake for me as the it will work for my application NOW but as i grow and change direction (real soon) i will end up with a double pumper or an inline, So yeahh it works for me right now but in a little wile it will be spare junk in box that the most i can sell it for is a 1/3 of my cost if i am lucky.
Better yet Just ask -- How many of these guys has lost an engine do to a larger than needed fuel system?

 

[Nick Micale]

Mike

[/quote]

It is easy to offer a warranty when there is a 800% markup on a pump. If the margin on Walbro pumps from years ago were still intact liberal warranties ......

I will try to be civil here, but both you Jack, and Mike, need to keep your blind affection of Walbro pumps from pumping out BS statements about the competition.

The DW is NOT a copy of the Walbro, it is a turbine-type pump, and the design is from a US company with a German background.

As far as a 800% markup, it is closer to 8% Jack.

I have used Walbro's for more years than I care to mention, and their first POS came to light with the 307 model which was a poster child for failure and bad performance. I had to replace MANY of them that died and were performing bad.

Then the later 340's became the nightmare.

Suppliers did not care as I NEVER was able to get replacement even if they were a few months old. I had to eat the labor to replace the POS, but suppliers never lost a dime.

I look out for my customer's best interest as that comes first for me, and to that end, I supply and install the best product available, and Walbro has NOT come close to filling that need.

So far on this board, one person said his DW pump failed. I asked him to send me the pump and I would replace it on arrival, no questions asked. It has never been received?

 

[Bruce Urie]

I did a braided teflon 3/8" feed line when my body sank on the frame.

I don't love saying that.

From the metal line area above the differential down to the inlet to the fuel filter.

Double clamped no special fittings it's worked for 10 years.

Braided teflon doesn't have a small bend radius however it can't be bent tightly.

Sorry about your body that sank on the frame....same thing happened to me, that's why I'm now on a diet.

Bruce '87 Grand National

 

[Black Sunshine]

Hello, now that I've bought almost all the parts I need and just have whatever pump setup I decide to go with left to buy I am reviving this thread. When I get around to upgrading the injectors probably within the next few years I think I am going to go with 80# injectors. Would I be better off getting the double pumper or a new sending unit and single Walbro pump? Like how much would the single 225LPH Walbro be lacking to fully utilize 80# injectors if needed? While it would be nice to save a few hundred bucks to get the single and get the car going sooner. It also would be nice to get the double pump and not have to worry about upgrading that area of the car for hopefully a VERY long time. Decisions...decisions..

 

[Ttype6]

Hello, now that I've bought almost all the parts I need and just have whatever pump setup I decide to go with left to buy I am reviving this thread. When I get around to upgrading the injectors probably within the next few years I think I am going to go with 80# injectors. Would I be better off getting the double pumper or a new sending unit and single Walbro pump? Like how much would the single 225LPH Walbro be lacking to fully utilize 80# injectors if needed? While it would be nice to save a few hundred bucks to get the single and get the car going sooner. It also would be nice to get the double pump and not have to worry about upgrading that area of the car for hopefully a VERY long time. Decisions...decisions..

You already have a hotwired Walbro. You have more pump than your combo can use. Why do you want to spend money on another Walbro. Since you already have a lot of pumping ability,get one of Red's volt boosters and buy a doublepumper in the future. It won't do you any good to buy another single pump set-up. You already have one.

 

[Black Sunshine]

Well that Walbro is about 10 years old not totally sure if it's kicking like it should. I'm replacing the tank, sending unit, fuel lines in that area of the car, the filter, and putting a Casper's volt booster on it. I'm thinking of replacing the pump while I am replacing everything else in that area of the car for peace of mind purpose that I won't have to mess with that area of the car. for a very long time. As I don't do my own work and pay a buddy that works on turbo Buicks as a hobby to do the work for me. I'm hoping it helps save on labor costs in the very long run. My body and frame are smashing together pinching my fuel lines causing a leak. I'm addressing that issue. The tank is very rusty so I can only imagine how dirty that fuel can get going through the back of the car. Hopefully addressing that issue cures what ails it so I can have transportation again. It's not drivable because sometimes under medium or greater throttle the car will sputter and the engine light will flicker repeatedly yet not throw codes and if I give it enough throttle the car will just die.

 

[V6sleeper]

Reds 5 years no issues so far....

 

[Black Sunshine]

That's cool. If I get a double pump though I am going with the racetronix one. Thanks for your input though. I'm just trying to decide if buying it well be worth it. Seems like it will in the long run after I upgrade my injectors in a few years and get my alky kit installed next year.

 

[87GN_70GS]

Like how much would the single 225LPH Walbro be lacking to fully utilize 80# injectors if needed?.

About 20#/hr per injector, 20 gal/hr total, or 25% worst case . This is at 70 psi, 100% inj dc, no volt boost and no alky. That number would come down with less airflow (i.e. less dc% and total fp), some voltage boost, and/or alky injection. Come down to zero?? I don't know....

 

[87GNSteve]

Walbro=garbage

 

[2QUICK2B6]

single walbro 340 has lasted me 5 yrs plus ... i have heard of people changing them out every yr to be safe ?

make sure you get a baffled tank

 

[Black Sunshine]

I bought one. It seems like a nice Dorman. Thanks for the info 87.

 

[Black Sunshine]

In regards to the hobbs switch why is 15 psi the recommended one out of the 15, 7, and 5? I don't really get what would be right with my application and what these different PSI have to do with a switch.

 

[TURBOPOWERED68]

In regards to the hobbs switch why is 15 psi the recommended one out of the 15, 7, and 5? I don't really get what would be right with my application and what these different PSI have to do with a switch.

the different PSI is for when the second pump would TURN-ON - Most start to fall short as the boost PSI rises which is the time that you would need the second pump to turn on in order to maintain the 1:1 boost to fuel pressure ratio.
well at least thats the way i understand it.

 

[RmvBfrFlght]

And without a return line upgrade turning on the second pump too soon can cause the fuel pressure to go too high. Which in turn can cause the engine to go so rich that it stops running (floods).

RemoveBeforeFlight

 

[Black Sunshine]

So I thought a Hobbs switch was like a normal switch I manually control switched one way one pump runs switch the other way both pumps run. So is that wrong and with the 15 psi switch the 2nd pump will automatically turn on at 15 boost psi regardless what position the switch is switched to?

 

[RmvBfrFlght]

A Hobbs switch is controlled by pressure. It gets tied into a line/hose to the intake manifold vacuum/pressure. So once boost hits say, 15 psi, the switch closes and turns on the secondary fuel pump. No need for user intervention to enable/disable the secondary pump.

Take a look at the picture at this link:

http://www.racetronix.biz/mmWEBSTORE/Images/G7DP.jpg

Can see the Hobbs switch threaded end. That end gets vacuum/pressure referenced.

RemoveBeforeFlight