ok so i have read alot of threads on 3800SC swaps and i am getting close to getting mine engine back together and getting ready to be put in my 86 GT. Im wondering what fuel pump i should use or what is the overall most successful/best to use.

A lot of people use the Walbro 255L/Hr, I'm going with one made by Deatschwerks though.

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-Chris
'85 V6 SE 4sp (SOLD)
'88 GT Auto (Under the knife @ Sinister Performance... stay tuned. )
'99 Kawasaki Vulcan 500, owned since new
'03 Sentra SE-R Spec V (Daily driver)
'09 G37x w/ Premium & Nav (wife's car)

Is it/Will it stay stay stock? There are several choices out there but the main 2 factors will be the fuel pressure and the sound. The Walbro is loud but works. I am using the one from a mid 90s Corvette and seems to work fine and bolts right in but mine is completely stock. From what Ryan said is that the Corvette FP is about at its limit for the 3800SC even though its for a V8 and wouldnt recomend using it. I havent seen a problem with it and others on here have used it with success so that would be up to you if you wanted to try it but with what Ryan has stated, if It was going to me modded, I would look into a better pump.

Hope this helps,

Steve

[This message has been edited by JumpStart (edited 06-13-2012).]

AC Delco EP376 was the corvette pump that was recommended for years, and I have used them for several swaps. Ryan (Darth Fiero GMTuners.com) now recommends the EP381 which I have used on my last 2 swaps. I get them from SummitRacing.com around $80

I guess a key question is what will be your power level at the end. I used the EP381 on my nearly stock S3. Works great. I have a FP gage and there is no drop at all at WOT. I'm sure it will support a lot more than what I plan for.

To answer the question most of you asked. at the moment the plan is to get everything ready for the engine to be put back together and decide from there if I want to do the cam. that will be the only mod to it if I do. mainly because I'm using the stock 4spd. if I don't put one in the engine will remain stock. So I guess my best choice would be to go with the EP381? And as for the walbro 255 pump where would you find a good made one? I was hearing a lot of the Chinese ones not doing so hot

http://www.deatschwerks.com/fuel-pumps

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Turbo 3800 E85 F23 5spd spec5
11.54@132.7

quote Originally posted by Justinbart: http://www.deatschwerks.com/fuel-pumps

I've heard good things about Deatschwerks products and a 3 year warantee is impressive. They also advertise that they are quiet turbine pumps like the Bosch. . The only thing is that they don't seem to focus on domestic cars. It would probably take a bit of fabrication to make the 255 lph pump fit on the Fiero brackets. I am seriously thinking of trying one of their fuel pumps. Do you know why they say their products are only designed to be used for "off road" use?
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" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Powerlog manifold, Northstar TB, LS1 MAF, 3" Flotech Afterburner Exhaust, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "

[This message has been edited by Dennis LaGrua (edited 06-13-2012).]

quote Originally posted by Dennis LaGrua: I've heard good things about Deatschwerks products and a 3 year warantee is impressive. They also advertise that they are quiet turbine pumps like the Bosch. . The only thing is that they don't seem to focus on domestic cars. It would probably take a bit of fabrication to make the 255 lph pump fit on the Fiero brackets. I am seriously thinking of trying one of their fuel pumps.

it's very similar in size and shape to a walbro. Get he DW200 if you're running pump gas and DW300 if you ever plan on using E85 or other alcohols.

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Turbo 3800 E85 F23 5spd spec5
11.54@132.7

So it will be easy to wire/fit in the stock housing then? Also does it matter which one I choose from the drop down list?

[This message has been edited by spartan_chaz (edited 06-13-2012).]

quote Originally posted by spartan_chaz: So it will be easy to wire/fit in the stock housing then? Also does it matter which one I choose from the drop down list?

Get the universal fit pump and kit.

One thing to be careful about when installing a new fuel pump is to find one which keeps on working with the high alcohol concentrations found in today's fuel. I have one of the Corvette fuel pumps on a 3800 SC Series III engine and it has been running well for several years. I have another stock 3800 SC Series II that has been eating fuel pumps (three or four so far) but they were not the one designated for the Corvette. These pumps failed in anywhere from 30 to 200 total miles and alcohol damaging the internal seals appears to be the problem. I plan to make the last fuel pump swap toward the end of this month and will post the part number and results after I get a few miles on it.

Nelson

I'm running a TRE pump for a Buick Grand National, no complaints it's quieter than the last Delco i put in.
http://trefuelpumps.com/i-8...5-lph-fuel-pump.html

ac delco ep381 for the win!

well that would be two marks for the 381.

I am running the Airtex equivalent to the EP376 which is the ES3270. I just put it in to get the swap on the road for cheap. My engine is bone stock.

I had a scanner on it all this weekend doing a bunch of launch tests, I was watching the Lean Trims, AFR, KR, and general misfires. Every thing was exactly where its supposed to be with no fluctuations. Don't know how long it will last, but its performance is good.

And I can't even hear it run.

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Project Genisis Lo Budget 3800SC swap

88 Coupe under construction.

I've been running an EP261 for almost 5 years and 45k miles on my lightly modded swap. Can't hear it run, and the times I've scanned at WOT, the fuel supply is adequate. These pumps were used in the 89 GTAs with the 3.8 turbo.

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DO NOT use the Corvette/EP376 pump with any 3800 Series 2 or 3 SC swap. These pumps were designed for N/A engines that ran a max of 50psi on their fuel systems. These pumps were not designed to operate at higher pressures. A bone stock 3800 Series 2 or 3 SC is going to want around 60psi of fuel pressure at full throttle (& full boost), and these types of N/A pumps may not supply enough volume of fuel flow at the higher pressures.

The EP381 was used with the Syclone/Typhoon 4.3L Turbo and is rated to flow enough fuel for a boosted engine making up to 300hp running up to about 60psi of fuel pressure. If your build is going to exceed this power level, I strongly recommend using an aftermarket pump such as the Deatschwerks DW200 or DW300 (for "universal" applications).

The DW200 / DW300 pumps are not designed to fit into the OE GM fuel pump cradle that came factory attached to the bottom of the sending unit that comes with the Fiero gas tank. I just installed a DW200 pump into an 88 Fiero tank and I had to cut the cradle off the bottom of the Fiero sending unit. I used 2 large metal hose clamps to secure the DW200 fuel pump to the sending unit so it would not be able to "swing around" inside the tank. Even though the DW200 fuel pump is mounted rigidly to the sending unit, it still operates at a quieter noise level than a Walbro 255lph pump does when mounted with the factory rubber isolators (when tested outside the car). Can't really beat the "no hassle" 3-year warranty that comes with these pumps, and the price is right too (compared to other aftermarket performance pumps).

-ryan


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OVERKILL IS UNDERRATED

Custom GM OBD1 & OBD2 Tuning | Engine Conversions & more | www.gmtuners.com

[This message has been edited by Darth Fiero (edited 06-14-2012).]

Ok cool Ryan! Just because of that info think ill go with the DW200 pump. As for cutting the bottom of the sending unit for the new pump to fit will this work the same on the 86 sending unit? I will be putting a cam in the engine while its down so better idea to go with the higher pump.

I know this thread says S/C, but I'm using the Corvette fuel pump on my 3800 N/A with no problems.

quote Originally posted by spartan_chaz: Ok cool Ryan! Just because of that info think ill go with the DW200 pump. As for cutting the bottom of the sending unit for the new pump to fit will this work the same on the 86 sending unit? I will be putting a cam in the engine while its down so better idea to go with the higher pump.

I think the "cradle" piece I'm talking about is the same on all Fiero sending units, regardless of year. When you get the DW200 pump in your hands, you'll see it has a much different "pre-filter" it uses vs. the OE Fiero fuel pump's. And the different design won't work properly with the factory fuel pump cradle/support that's spot welded onto the sending unit. You could probably wedge it in there, but the metal cradle has sharp edges so it would eventually wear a hole in the pre-filter and you don't want that to happen. It would be best to just cut it off and use a pair of hose clamps to attach the DW200 pump to the sending unit.

quote Originally posted by mattwa: I know this thread says S/C, but I'm using the Corvette fuel pump on my 3800 N/A with no problems.

You should be ok using the Vette pump with an N/A 3800 engine. The N/A 3800 Series 2 engines run a max fuel pressure of about 50psi which the Vette pump can deal with.

[This message has been edited by Darth Fiero (edited 06-15-2012).]

Yep, it should be good. Until I put on a turbo of course.

If i write a 500 word essay here. Does that mean i'm more rite?

Edit: corectmed spellin.

[This message has been edited by hercimer01 (edited 06-15-2012).]

quote Originally posted by hercimer01: If i write a 500car word essay here. Does that mean i'm more rite?

OH SNAP!

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Turbo 3800 E85 F23 5spd spec5
11.54@132.7

quote Originally posted by hercimer01: If i write a 500 word essay here. Does that mean i'm more rite? I had a scanner on it all this weekend doing a bunch of launch tests, I was watching the Lean Trims, AFR, KR, and general misfires. Every thing was exactly where its supposed to be with no fluctuations.

A scanner isn't going to tell you what the fuel pressure is doing nor is it going to tell you actual Air/Fuel Ratio since the GM computer doesn't use a WideBand O2 sensor (unless you've hooked one up and modified your PCM tune / scanner to give you such data). You can use narrow band O2 sensor voltage to figure out AFR numbers to a certain extent, but the factory-type narrow band O2 sensors were never designed to give accurate AFR readings outside of stoich A/F ratio so you shouldn’t trust these numbers.

I've seen posts by half a dozen people saying the same thing you are about the Vette pump you are using. I am happy that you guys are having "good luck" with your Vette pumps. But I've seen flow test data from several sources on these very Vette pumps and it isn't impressive. It wasn't designed to pump at the higher pressures the 3800 Series 2 SC engines are going to want; and that's a fact (the EP381 is, at least up to 300hp applications). Just because your particular Vette pump is "working" for you doesn't mean everyone else is going to have the same luck. I will further go on to say that Airtex pumps have a very poor reliability record, and now many auto parts stores around here that still sell them don't give you crap for a warranty on them (and that's saying something).

The EP381 pump I'm recommending isn't any louder than the EP376 pumps I've heard. And I think it is funny how many people are "bothered" by fuel pump noise considering the other squeaks, rattles, noises, and issues they'll ignore in their own cars but yet they'll complain about fuel pump "noise".

The DW200 pump I just installed doesn't seem to be any louder than the OE pump I removed from the tank either; nor does it cost much more than an "OE replacement pump".

So there's no reason to mock my posts. If you disagree, then just say it and move on; if you have proof of what I say is incorrect, then post the facts you have backing up your claims. But I (and I’m sure most everyone else on this forum) would appreciate it if the same misinformation / bad recommendations wouldn't continue to get posted. There's already enough of that in the archives.

[This message has been edited by Darth Fiero (edited 06-15-2012).]

Ryan

I think he was just trying to be funny, so don't sweat it. You are one of the most knowledgeable people and very generous with sharing your knowledge on the forum.

Thanks for the great info. I have a Walboro pump that is louder than my twin 9 year old daughters...and that says something. I wish I had known about this option before!

Once again thanks Ryan! I ordered the dw200 universial pump this morning. I'm sure my buddy can find some way to get the pump to fit easily >.< he is a handy guy lol but I'm pretty close to being ready to start the actual swaping of.the engines