Fuel Pump

[Drfatz]

I am in the process of fitting up a Garrett GT3071R Turbo along with larger injectors, new memcal, larger chargecooler with electric pump and a massive exhaust. The question now is what fuel pump should I use? Suggestions wanted!

[Artie]

I am in the process of fitting up a Garrett GT3071R Turbo along with larger injectors, new memcal, larger chargecooler with electric pump and a massive exhaust. The question now is what fuel pump should I use? Suggestions wanted!

Graham,

I have run across the same query only to find that no one really knows what upgraded pump should be used! I spoke with a few specialists and all said that I shouldn't bother at the power levels these engines achieve. I haven't pulled the pump out but seeing as the rest of the electonics are GM line, have you already taken out the pump? If so then pull the sku number off the pump and dimensions. I'd be willing to bet Walbro makes a similar sized pump that will flow more than what our pumps flow. I have 3 extra Toyota supra pumps that I used in my RX7 years ago for a project and these are direct bolt in to the RX7. I'd be interested to see what our pumps look like. Do you have any pictures of it?

Artie

[Vulcan Grey]

http://www.lotuscolorado.com/vulcangrey/ga...emoval/P8120125

[Artie]

http://www.lotuscolorado.com/vulcangrey/ga...emoval/P8120125

Cool, I followed the whole r and r of the tanks before, any pics of the pump by itself without the piping? It seems the same dimensions of the denso units(RX7, Nissan 300zx, Supra and 3K gt all use the same size pumps, Supra flows Hella lots of fuel....enough for about 500hp on the 3.0L inline 6 turbo engine)

Artie

[Vulcan Grey]

Cool, I followed the whole r and r of the tanks before, any pics of the pump by itself without the piping? It seems the same dimensions of the denso units(RX7, Nissan 300zx, Supra and 3K gt all use the same size pumps, Supra flows Hella lots of fuel....enough for about 500hp on the 3.0L inline 6 turbo engine)

Artie

The Lotus manual states that the normal pump flows 4x what would ever be required by the Esprit...

However, they did make a "higher" flow pump for the Sport 300, which some of my friends have.

I actually use an X180-R pump now, as mine seized up. I just looked at my old pump and could see no markings other than an "AC".

My SE pump was pink, and IIRC the X180-R pump was beige... And it had a "race replica" tag on it.

Ok I just added some more pics of my old pump to my website.

http://www.lotuscolorado.com/vulcangrey/ga...kremoval?page=9

Edited March 20, 2007 by Vulcan Grey

[Esprit Aviation]

Trev,

Unless you're looking to get more than 350-400 HP, the stock pump would work fine.

Once you get everything else set up, you could use a wideband 02 sensor/meter to determine if your mixture is leaning out @ max power levels.

Cheers, Lee

[Drfatz]

I am just hoping that with all of my upgrades I don't go and run out of fuel. Basically the only thing left stock is the engine internals. My pump has only 30,000 miles on it so it should be okay, but the last thing I want to do is run lean. Also the tanks have been removed, dipped and stripped so I currently have the pump laying in a bag on the bench now would be the time to replace it!

-G

[Artie]

so close yet so far away! The RX7 pump is about the same size and length, but the inlet is in the center on top and the pickup is on the edge of the bottom. I'm sure my screen is caked up with 66K miles of junk! I'll eventually pull the pump out when I get the car back to replace the screen and maybe the pump.

Artie

[Esprit Aviation]

Graham,

If you use a wideband O2 sensor/meter combo, you can monitor your ratio. Your stock pump may be fine. It is the best way to find out, as it also allows you to fine tune your mixture if necessary. Plus if anything goes wrong w/ your fueling, you'll know it. I would'nt be w/o one!

The one I have is made by NGK, called Powerdex AFX. Very accurate and a simple install to boot.

Regards, Lee

[docf]

walbro 255lph in tank replacement pump or if you want get the external one and add a fuel pickup where the old pump used to live. They are dirt cheap ($150 if i remember correctly) and if you google it there are many many DSM / Honda tuners using these in 400-500hp street applications with no real reliability issues. There are plenty of more expensive pumps out there but chances are they would be overkill in this application.

http://www.injectedperformance.com/ViewProduct.aspx?ID=1635

even cheaper than i remember!

[Drfatz]

I think for now I'm going to stick with the stock pump. However, I will be installing a wideband O2 sensor and if there are any problems I am getting the Walbro pump!

[Artie]

I think for now I'm going to stick with the stock pump. However, I will be installing a wideband O2 sensor and if there are any problems I am getting the Walbro pump!

Travis,

Do you know the flow rating of the stock pump? I found the cross reference pump at my local parts store but the rating was 148L/hr, is this what the Lotus unit is rated for? Also, they don't have a round lower pump inlet screen it's rectangular, would this screen work or is the well round?

Artie

[Artie]

I think for now I'm going to stick with the stock pump. However, I will be installing a wideband O2 sensor and if there are any problems I am getting the Walbro pump!

Graham,

Just ordered a Sport 300 pump and screen from JAEparts.com ask for Jeff. 186bucks for the pump and 20 bucks for the screen. The flow rate is supposed to be much better than stock on the SE. Plus it drops right in place no mods needed!

Artie

[ragingfool35]

www.rockauto.com

look it up. gives old ac/delco part no and replacement

replacement is $63

universal i think

[Vulcan Grey]

Travis,

Do you know the flow rating of the stock pump? I found the cross reference pump at my local parts store but the rating was 148L/hr, is this what the Lotus unit is rated for? Also, they don't have a round lower pump inlet screen it's rectangular, would this screen work or is the well round?

Artie

No idea, but I have heard something about the GM cross ref part not flowing as much... But then I've heard the replacements work fine as well...

[Artie]

No idea, but I have heard something about the GM cross ref part not flowing as much... But then I've heard the replacements work fine as well...

Yeah, one of those things I'd rather not "chance" I've put this much effort into making the car perform I don't want to chinz and get a faulty or "close" replacement that doesn't deliver. If I take the old pump out(which I am now that I ordered the sport 300 one) I'll replace it with new/better. Also, I'll have a look into the tank, mine seem to be in good shape and very little signs of rust so far. I would rather have too much fuel then not enough, and my new chip from WC engineering likes to overboost on overtaking to about 1.4 bar!

Artie

[Riddlemr2]

Has anybody actually put a Walbro fuel pump in their Esprit? I had one in my MR2 and thought it was great (at least it never broke, and I was never lean on the dyno at 18psi). The Walbro pumps I find online are all vehicle-specific though...

http://www.titanmotorsports.com/wafupuforto.html

$120 for such a good fuel pump is hard to pass up, but do they have a Lotus-specific application?

[Artie]

Has anybody actually put a Walbro fuel pump in their Esprit? I had one in my MR2 and thought it was great (at least it never broke, and I was never lean on the dyno at 18psi). The Walbro pumps I find online are all vehicle-specific though...

http://www.titanmotorsports.com/wafupuforto.html

$120 for such a good fuel pump is hard to pass up, but do they have a Lotus-specific application?

Dave,

Not sure if there is a vehicle specific Walbro, but Jeff at JAE has Sport 300 pumps for $186 US, not bad considering it's drop in! Plus he has them on the shelf. Should be getting mine this week.

Artie

[Riddlemr2]

Dave,

Not sure if there is a vehicle specific Walbro, but Jeff at JAE has Sport 300 pumps for $186 US, not bad considering it's drop in! Plus he has them on the shelf. Should be getting mine this week.

Artie

Artie, that does sound like a good idea. Do you have any specific data on how much better the Sport 300 pump is? Flow rates, anything like that?

thanks!

[Artie]

Artie, that does sound like a good idea. Do you have any specific data on how much better the Sport 300 pump is? Flow rates, anything like that?

thanks!

Dave,

No, I spoke with Jeff and asked him about flow rates and he wasn't sure, however, they do flow substantially more than the stock SE pumps I know. I'm replacing mine as I'm sure mine is the original and the screen is most likely clogged with gunk! The pump looks much like the GM 3.0L V6 pump and those stock flow 150Lph. I'm sure it's more than that.

Artie

[Riddlemr2]

Dave,

No, I spoke with Jeff and asked him about flow rates and he wasn't sure, however, they do flow substantially more than the stock SE pumps I know. I'm replacing mine as I'm sure mine is the original and the screen is most likely clogged with gunk! The pump looks much like the GM 3.0L V6 pump and those stock flow 150Lph. I'm sure it's more than that.

Artie

Well, JAE is out of the Sport 300 pumps because I just bought the last one

[Tony94S4]

I've heard walbro for gm maybe plug and play I posted here wile back here is a link

http://www.glcforum.com/esprit/forums/inde...3&hl=walbro

Lucas from this forum uses walbro

here is his great web site link

http://karmavore.net/

[Vulcan Grey]

just found this on the yahoo list

Description Manufacturer Part_number Comments Source

Confirmed

Fuel Pump GM "1986 GM Multi-Port EFI Fuel Pump.

1986 GM Multi-Port EFI Fuel Pump" Yes

Fuel Pump AC Delco 6443225 TimRdLotus No

Fuel Pump Bosch 69223 TimRdLotus No

Fuel Pump Carter (Federal-Mogul) P74006 1986 Buick Skylark V6

3.0L Dr.Hess Yes

Fuel Pump AC Delco EFP241 (60-90psi, 40Gal/hr) 85-

89 Camaro, 88-89 Corsica + Berretta, 88 buick Regal crazy canuck

No

Fuel Pump European GM 06443228 fits some Land Rovers

crazy canuck No

Looks like I used this one:

Carter (Federal-Mogul) P74006 1986 Buick Skylark V6 3.0L

I bought it at O'Reilley's. It was an exact replacement for my 89

non-SE. Your S4s will most likely be the same. I don't have a cross

on the float, but I used this strainer:

Fuel Pump Strainer (screen) Carter (Federal-Mogul) STS-9 Not

exact, but fits

and it did OK. You just have to "clock" it to make sure it fits in

the well down there.

Dr.Hess

so 40gal/hr = 151L/hr

[Drfatz]

If I put in the 255 lph Walbro pump am I going to have to worry about changing my pressure regulator or can I just install the pump and be done with it?

Thanks,

Graham

[Artie]

If I put in the 255 lph Walbro pump am I going to have to worry about changing my pressure regulator or can I just install the pump and be done with it?

Thanks,

Graham

Graham,

You won't need to change the regulator unless you need to enlist higher fuel pressure. The higher flow pumps will ensure that at higher rpm and boost the flow will be constant and the specified rate(pressure). Typically older pumps(not just esprit pumps) tend to flow proper psi(pressure) but they cannot keep up with the demand and can't continuously flow the required fuel. A higher flow pump will not peter out if you will since the gerator's(pump blades internally) are designed to flow more fuel at the same pressure, the fpr will send fuel accordingly at the right pressure down the fuel rail, then the ecm will dictate the pulsewidth and duty cycle dependent on boost/rpm etc. THis allows the optimal amount of fuel thru the injector, more so than the stock pump was doing cause it was becoming inefficient at those higher boostlevels/rpm.

Artie