For those running external: Do you wish you would have gone internal pump?

[NEWFISHER]

When you did your build and were on the fence buying another tank, internal pump sender etc. and you chose the simpler route aka the external mount....have you been happy with it, too noisey etc? I have built a few rock crawlers and although never really concearned with pump noise, I have always insulated the band clamps well enough that I could never hear the pump over the sound of the Swampers when driving to the trail head LOL!
Just starting my shopping list on a return style system 2003 5.3 and thinking of taking the easy way and going external for a 1946 Suburban build.

[Blackpony]

I used a bosch external and with just a small amount of insulation it was about as loud as any other factory truck out there.

[BR3W CITY]

You can't hear much over my exhaust, so the pump wasn't an issue. I went external for its ease-of-access and ability to clean and change on the fly. Its also easier to upgrade to a high-hp unit like an A1000.

The only downside I see is that even with a small sump and some tank foam, if I'm down to 1/3 tank, I can slosh fuel hard enough to misfire if I take a HARD turn. I don't road race, but for an autocrosser it could be a downer. Some baffling would solve it as well, thats really the only thing I've noticed.

[Low Elco]

Everyone I've talked to says internal, if you can get away with it. S10's have a nice flat tank top for a good mount ring, and you just cut the stands on a truck bucket down to what you need and go from there. '98-02 V8 Camaro setups seem to be internally regulated in the bucket, I read somewhere, simplifying things further. If you have vertical clearance and a decent flat spot on your tank top, easy peasy.

[Custom 68]

I was external for a few years off a poly Blazer tank when I first did the swap. The noise was not a problem. I know a pump does a better job pushing the fuel rather than sucking it out then pushing it. I was concerned that it would also get hotter. I was coming back from a an 800 mile trip running pretty hard thru the heat of the day when it went out. I coasted down an off ramp and after it cooled it limped it home stopping a few times to let it cool. It took longer of course but I made it. I swapped it out but knew it could always be a problem When I saved up I got a Boyds tank with an internal pump, all the new ones are internal so there is a reason for that. External worked for me for years and did great but I was always concerned.
If you could I would go internal but either is proven to work.
Good luck
David

[68GMCCustom]

Mines located on the frame next to the tank so it has to pull a little, but mostly is pushing like a tank mounted pump. They are certainly noisier this way... but my walbro255 is over 3 yrs old now but has only 1000mi or so.

[NEWFISHER]

Thanks for the help guys!
LowElco I will check out the s10 and the F body stuff.

[Low Elco]

You got it- there's pics of what I did on the Yeller thread.

[ivorton74]

ive got a walbro 355 in mine on the inside of the frame right by the tank. its actually not that loud at all. when the truck is idling u can hardly hear it. its been almost a month and so far so good

[Indian113]

I have over 7000 miles on my cheapy pump and regulator I bought from Speedway. I haven't had any problems yet! Yes it's a little Noisy but my stereo and exhaust covers it for me. I like the fact it's mounted to my frame and I can get at it easy to change. If Needed.

[Clyde65]

I have a not so cheap pump ( Pierburg, came on Mercedes vehicles), it has lasted about 5K miles and 4 years, so IMO it has been better than some of the options available in 2009 when I started building the motor/trans combo.

They have gotten better IMO over the last few years.

Mine isnt noticeable at all except at start up, there is a slight whine when it turns on and forces fuel, then I start it.

[chuckmc8]

I use Airtex E2000 from Advance Auto. Mounts on the frame- Ive done a bunch and had no problems with them. I wouldnt put one in the tank myself. These are quiet and work well

[Matt Cramer]

Originally Posted by BR3W CITY

The only downside I see is that even with a small sump and some tank foam, if I'm down to 1/3 tank, I can slosh fuel hard enough to misfire if I take a HARD turn. I don't road race, but for an autocrosser it could be a downer. Some baffling would solve it as well, thats really the only thing I've noticed.

I have the same issue with an in-tank pump. The stock fuel tank isn't very well baffled.

[Gooker928]

I used the 225 on my 78 and it has held up for two years and 10000 miles.
The Engine will bog down when cornering hard and accelerating hard when below 1/4 full.

[BR3W CITY]

Originally Posted by Gooker928

I used the 225 on my 78 and it has held up for two years and 10000 miles.
The Engine will bog down when cornering hard and accelerating hard when below 1/4 full.

this thread was like 6months old lol. Your pump does that because the tank isn't sumped, or baffled, depending on the exact symptoms. You can try to use tank foam to quell that.

[scottybaccus]

You'll be best served by an in-tank pump, with OE baffling. RockAuto sells tanks for '87+ models for under $100, and efi pickup assemblies, '87+ as well, for under $100. Add a Walbro 255 lph high pressure pump, and an external filter with the OE return type rails and regulator. You get OE reliable for a great price.
The blazer guys can choose from 25 or 31 gallons, and the swb guys can have dual tanks with the '87 tank selector valve. It's rated 75 psi.

[ls1nova71]

I would have to say intank is the best method too, but if that's not an option, its really hard to beat a nicely sumped tank. I can drive my 71 with factory in cab sumped tank on E for a long time and never get any starvation problems. They do have their drawbacks, changing the pump or filter could be messy if the tank is full, but for no more than I do that I'll deal with it.

[slotard]

When I do a swap (probably 4.8 or 5.3), I'm planning on buying an 87+ Blazer 31 gallon tank. They fit on LWB right? In between the frame rails seems like a much better place than hanging low on the side like my current one.

[Wasted Income]

Originally Posted by slotard

When I do a swap (probably 4.8 or 5.3), I'm planning on buying an 87+ Blazer 31 gallon tank. They fit on LWB right? In between the frame rails seems like a much better place than hanging low on the side like my current one.

I used that tank in my K-10. It would have been pretty close to the rear diff, if not for the lift.

Might be ok if you move it back a bit though. I didn't want to relocate the last crossmember.

EDIT: Just saw you have a square-body. Not sure how it would fit on your truck...but maybe the pics will still help.

[slotard]

Damn, springs that arched can't ride well... why didn't you go shackle flip instead?

[Andy4639]

I've had EFI since 1989 and had in tank pumps the whole time. # of them to be exact.
First one I learned I needed a tank with baffles. It lasted maybe a year are 2. Sucking air is the worst thing you can have one do. All the sloshing around and needle going all over the place drove me crazy.

Second one last for several years. The last one which I had to replace when I did the LS swap had been in for over 10 years.
INtank is by far the best way to go.

[ls1nova71]

Originally Posted by Wasted Income

I used that tank in my K-10. It would have been pretty close to the rear diff, if not for the lift.

Did that tank fit by just trimming/removing part of the bed floor rail? Or did you put any kind of body lift on it? I'd like to go with a bigger tank than the Blazer tank on my next truck.

[Wasted Income]

Originally Posted by slotard

Damn, springs that arched can't ride well... why didn't you go shackle flip instead?

It's not bad. It's a Skyjacker Softride. Supposedly the best riding 4" lift.

[Wasted Income]

Originally Posted by ls1nova71

Did that tank fit by just trimming/removing part of the bed floor rail? Or did you put any kind of body lift on it? I'd like to go with a bigger tank than the Blazer tank on my next truck.

That bed floor support was cut out a long time ago, in another life for a poly blazer tank. Once that is done, it fit great with no body lift.

[ls1nova71]

Originally Posted by Wasted Income

That bed floor support was cut out a long time ago, in another life for a poly blazer tank. Once that is done, it fit great with no body lift.

Cool, I may have to give this a shot next time!