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#1 |
Registered User
Join Date: Sep 2006
Location: colorado springs colorado
Posts: 737
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Re: EFI with factory Fuel Tank??
Well it was a thought,,,,
Frank
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70 chevy lwb c10 454/th400 and a 9" rearend suicide doors, marker light fuel fill, 4" cowl , mini tub |
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#2 |
Registered User
![]() Join Date: Sep 2005
Location: Kansas City Kansas
Posts: 212
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Re: EFI with factory Fuel Tank??
I used a 72 tank with the tank vent behind the seat for my TPI setup, I mounted the pump under the passenger door frame rail and put a vented cop on the tank, so far, no issues although the injectors are noisier than a blown engine bearing.
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Mike 1967 Chevelle 1969 Camaro 1969 Chevy C10 1977 Full blown 383 Corvette (with NOS) Various Family cars (daily drivers) 1945 Harley Servicar 1998 Custom Harley sporster NEW ARIVALS: 2003 Police Crown Vic 2006 Dodge Stratus A true friend is someone who still asks to repay you knowing you will never accept. |
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#3 |
Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,936
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Re: EFI with factory Fuel Tank??
I have a Iroc TPI in my 71 since 87.
I tried using the stock tank and it just didn't seat well with me having that loud 12 volt 25 amp pump sitting behind me in that tank full of gas. I had problems the whole time with gas sloshing around at anything less than 3/4 full. I ran a in tank pump, and electric pump's don't like sucking air. I had replaced them a few times when I decided to go with a baffeled tank. Do yourself a favor and buy a tank for EFI. Baffeled tanks are the only way to go.
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1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 ![]() Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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#4 | |
Registered User
Join Date: Mar 2008
Location: Calgary, ab
Posts: 325
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Re: EFI with factory Fuel Tank??
Quote:
Anyhow I've been looking at more pumps and come across this walbro unit that can go inside the tank with a filter screen on the inlet side. I thought that this is the one but I didn't think about how loud this thing is going to be humming inside the tank behind the seat? Does anyone no how loud these walbro pumps are? Here is a picture of what I am talking about. [IMG] ![]() |
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#5 |
Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,936
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Re: EFI with factory Fuel Tank??
The pump isn't that bad with a full tank. When it get's around a half tank you better have a good radio to over come the noise.
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1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 ![]() Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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#6 |
Registered User
Join Date: Mar 2008
Location: Calgary, ab
Posts: 325
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Re: EFI with factory Fuel Tank??
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#7 | |
Kill Bill...et
Join Date: Aug 2008
Location: Winchestertonfieldville, Wa
Posts: 366
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Re: EFI with factory Fuel Tank??
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#8 |
Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,936
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Some fuel for thought.
First off the return line needs to go all the way down into the tank. This is so it doesn't cause static build up inside the tank when fumes are present. If the truck isn't grounded properly. Leave the tank as is and build a small tank just big enough to fit the electric fuel sending unit inside it and mount under the truck. Plum all the fuel lines back to it. It will be feed by gravity. Stock tank has no modes done to it. ![]() ![]()
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1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 ![]() Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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#9 |
67-72 parts collector,…
![]() Join Date: Nov 2002
Location: Mid-MO
Posts: 22,698
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Re: EFI with factory Fuel Tank??
subscribing to this one,...
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Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823 |
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#10 |
Registered User
Join Date: Mar 2008
Location: Calgary, ab
Posts: 325
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Re: EFI with factory Fuel Tank??
I saw this lsx build thread over at ls1tech
http://www.ls1tech.com/forums/conver...vy-pickup.html He uses a low pressure (lift pump feeding the walbro pump) all from the stock fuel tank. [IMG] ![]() ![]() ![]() |
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#11 |
Registered User
![]() Join Date: Nov 2009
Location: OK
Posts: 274
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Re: EFI with factory Fuel Tank??
Steve, how did it turn out? What was your final configuration. External walbro pump? I'm looking to keep the factory tank on my 65 with a 07 4.8l and would like to install a walbro 255 inline pump on the frame rail. Also open up a new 3/8" hole in the sending unit plate for a return line.
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Robert 1965 Chevy C10 http://67-72chevytrucks.com/vboard/s...d.php?t=374373 1997 Chevy K2500 6.5 diesel |
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#12 |
Kill Bill...et
Join Date: Aug 2008
Location: Winchestertonfieldville, Wa
Posts: 366
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Re: EFI with factory Fuel Tank??
It's been working out great. I got a '72 sender with the return line in hopes of making it work, but the return was just too small. I pulled it, and put larger stainless line in and ran it down about half the length of the pick-up line. All new lines to the fuel rail and back...(EFI line wasn't cheap) and an in line fuel pressure gauge shows me running between 38 and 45 psi steady. So far no problems! No cavitation, and no leaks. I'll snap some pics if you need, but I'm running a pre pump filter and a post pump filter all mounted to the frame rail on the drivers side. I put a couple drops of oil in the inlet side of the pump and made sure to prime it before letting it run. Necessary...? I dunno, but I figured it couldn't hurt.
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#13 |
Registered User
![]() Join Date: Apr 2010
Location: Holmen, WI
Posts: 212
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Re: EFI with factory Fuel Tank??
Here is my set up for TPI. Radiator shop soldered in the 3 threaded bungs on the bottom of the tank. Gravity feed to frame mounted high pressure fuel pump. When I turn hard in a corner or have a low fuel level I never have a problem with fuel starvation. I use the original fuel line from the sending unit as my return.
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ROD ![]() 1969 K10 4x4 Short Fleet. Tuned Port Injection 350/700R4, Cruise, tilt and factory A/C. 1971 C20 Camper Special. 350/350. SOLD 2002 Chevy Tahoe LT Last edited by Rodk65; 08-12-2010 at 01:57 PM. |
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#14 |
Registered User
![]() Join Date: Nov 2009
Location: OK
Posts: 274
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Re: EFI with factory Fuel Tank??
Thanks steve. I like pictures, if it's not too much hassle...
Rod thanks for sharing! I was contemplating using the original line as a return and putting a hole in the bottom. I might just take your pic up to a local radiator shop and see if they can duplicate something similar. I've been a little concerned with putting a centrifugal pump down on the frame and then asking it to pull the fuel up to the top of the tank and back down to the frame rail.
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Robert 1965 Chevy C10 http://67-72chevytrucks.com/vboard/s...d.php?t=374373 1997 Chevy K2500 6.5 diesel |
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#15 |
Gearhead
Join Date: Jan 2008
Location: Colorado
Posts: 1,193
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Re: EFI with factory Fuel Tank??
From my experience, sucking fuel is very hard on the inline pumps, I had mine mounted too high and it burned up pretty fast running anything below half tank. I would recommend either in-tank or something like what Rodk65 did, I think its the only way to have a reliable system. The intank would also be far quieter, my Walboro is pretty loud and it only gets worse when its hot out or lower fuel levels. Just my .02
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2002 Saturn SL2, My D/D 2019 Ford Fusion SE, Ecoboost - Wife's D/D 1993 Camaro Z28, A4, CAI, Cat-Back Exhaust Project C10 (my 72' C10 w/96' LT1, 700R4, bagged F&R, 18's (for now), Short/Fleet) -- SOLD! Build Thread: http://67-72chevytrucks.com/vboard/s...d.php?t=313644 |
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#16 |
Registered User
![]() Join Date: Nov 2009
Location: OK
Posts: 274
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Re: EFI with factory Fuel Tank??
I like the idea of an in tank pump, I'm just a little concerned about the noise. I'm thinking the buzzzzzzzzzzzzzzzzzzzz.... would get annoying after a while.
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Robert 1965 Chevy C10 http://67-72chevytrucks.com/vboard/s...d.php?t=374373 1997 Chevy K2500 6.5 diesel |
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#17 |
Registered User
![]() Join Date: Jan 2001
Location: Sabinal, Texas
Posts: 1,706
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Re: EFI with factory Fuel Tank??
I am running a FAST EZ-EFI with a frame mounted pump drawing from the cab tank and the saddle tank as well. I am using the '72 original sending unit with the return plumbed into the vapor line that is on the unit and extended to the bottom and away from the pickup to lessen the chance of sucking in air bubbles.. My saddle tank has a modified 90-OHM unit from a '75 stepper with the same return arrangement. It is feeding into a Ford van reservoir and changeover valve. No problems whatsoever. I have even run the tank dry (not that you would want to--kills HP pumps!). No cornering/sloshing problem due to the added reservoir. This is where a swirl pot is handy in some cases. Keep the pump below the lowest fuel level and you should have no probs. If you want a quiet in tank pump, go with a low pressure puller pump and feed it into a swirl pot and then go with the high pressure pump from the pot. The low pressure pumps are generally alot quieter but still make some noise.
I want quiet so I live with my setup. You could even fill the swirl pot with the OEM mechanical pump if you don't have alot of hungry horses to feed. Good luck, Bud |
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#18 |
Registered User
Join Date: Nov 2006
Location: OAKLAND CALI
Posts: 61
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Re: EFI with factory Fuel Tank??
I also had a EFI 5.3 4l80 trans W/ the fuel tank behind the seat it ran good BUT the smell of gas was bad so I sold the truck. And now Im building a other and was considering doing the blazer tank but I have a 4/6 drop and wonder if the tank would be to close to the ground?
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#19 |
Registered User
Join Date: Jul 2009
Location: Russellville, Arkansas
Posts: 1,699
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Re: EFI with factory Fuel Tank??
I mounted a Wallbro 255 on the frame under driver seat, with a prepump canister filter and the after pump corvette filter/regulator and 5/16th return line. The supply line is the stock 3/8 from tank. I used all new hard fuel line and double flare fittings to prevent leaks. Had to drill and J/B weld the return into sender at the dimple. Just make sure you follow the pickup line close with the return, or its hard to get into the tank. So far no problems. This is with a 2005 5.3 in a 68.
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#20 |
Registered User
Join Date: Nov 2007
Location: Marion, IL
Posts: 112
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Re: EFI with factory Fuel Tank??
Advantage of in tank pumps are that they are not as loud and the pump runs cooler. Throttle body fi would be ok with external pump as they do not require as much pressure as port injection. In tank pumps can benefit from internal baffles or a "sloush" pan so you don't get a lean condition when the gas level is low and you go around a corner. The newer Corvettes do not use a return line - maybe use that pressure regulator and skip the return line.
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#21 |
Kill Bill...et
Join Date: Aug 2008
Location: Winchestertonfieldville, Wa
Posts: 366
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Re: EFI with factory Fuel Tank??
Here's the pics I promised. Not as nice as RodK65's but it works like a charm. I must admit I've neverhad it below a quarter of a tank yet. You'll see the orange rubber behind the pump. It kept it off the frame and helped with the noise. Like I've said before, the trucks over 40 years old, there's nothing quiet about it and I'm okay with that. And now that I've taken a pic, I realize I need to do something with that power wire....yikes!
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#22 |
Back in the sticks
Join Date: Jan 2001
Location: Fordland, MO
Posts: 3,188
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Re: EFI with factory Fuel Tank??
When I first put the TPI in, I ran the stock tank. I just didn't care for the smell of gas. My pump is loud on initial prime too, but after that I never heard it. The fuel sending unit with the returns on it are the same after 71. I just used the same 5/16th line to dump back into the tank. Never had a problem other than the smell. One note though, you need your pump to be no further than 4 feet from the tank. Otherwise it has a tough time getting suction, like you said, they push better than pull. I'm using the same $100 dollar frame mounted pump from Autozone or where ever. After figuring out the 4 foot thing, I've had the same pump for 4 years now.
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1971 Cheyenne C-10 w/700R4 and Tuned Port Injection 1969 K5 Blazer w/Tuned Port 2010 2SS/RS Flaming Orange Camaro 2011 K1500 Suburban 2014 K1500 Pickup 2008 Nissan Altima? The wifes' hoopty |
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#23 |
Registered User
![]() Join Date: Oct 2012
Location: Newhall CA
Posts: 1,195
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Re: EFI with factory Fuel Tank??
good info!!!!
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69 SWB 780hp Hellcat powered, manual 6 speed, currie 9 |
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#24 |
Registered User
Join Date: Mar 2009
Location: Conyers, Ga.
Posts: 121
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Re: EFI with factory Fuel Tank??
Check out Z10's build. http://67-72chevytrucks.com/vboard/s...=1#post6356218
He made a surge tank that is fed by the engine mounted fuel pump. The surge tank holds the in-tank high pressure fuel pump from the same make/model as the engine. The return returns to the surge tank so the stock fuel sender is un-modified. The surge tank is mounted under the hood so the electric fuel pump is further away from the cab.
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Eric 68 Anniversary Gold C-20 LWB to C-10 SWB build thread: http://67-72chevytrucks.com/vboard/s...d.php?t=637492 It's hard to explain puns to kleptomaniacs because they always take things literally. |
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#25 |
Registered User
Join Date: Sep 2014
Location: Grand Prairie, Texas
Posts: 24
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Re: EFI with factory Fuel Tank??
I'm fairly new to this forum also. I have the 68 C10 SWB and everything is frame off at this time. I want to start building the fuel system to feed the 5.3 LS EFI engine.I jumped in on this forum late. I keep seeing "Blazer" gas tank referenced.What year, body trim blazer?
This is an awesome website and this discussion is helping me develop my fuel system ideas. Thanks everyone! |
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efi, factory fuel tank, pump pressure |
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