Lets get this LS 5.3 running! - Page 2 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

BIGglaSS · 04-13-2021, 09:35 PM

I think I got this 95% figured out. Making another push to get this running soon!

I am planning to do a Wrangler fuel tank and blazer sending unit. I see most guys use the EP381 fuel pump. However, this Delco HP 10004 sending unit comes with a fuel pump.
https://www.rockauto.com/en/moreinfo...060579&jsn=481

Will this fuel pump work, or should I get the sender without pump and EP381?

Thanks

prodjay10 · 04-15-2021, 10:22 AM

What kind of pressure is that putting out? If it’s for an ls based vehicle it’ll prolly work. Just gotta make sure it’s the right depth.
Posted via Mobile Device

BIGglaSS · 04-15-2021, 12:13 PM

I pulled the specs for what vehicles the EP381 pump goes in. The pump in the Delphi unit is for the same vehicles as the ep381. Same specs. 32 gph, 60 psi. Going to give it a try.

jjzepplin · 04-18-2021, 06:46 AM

Does the Wrangler tank have internal baffles?

BIGglaSS · 04-19-2021, 09:55 AM

Quote:

Originally Posted by jjzepplin

Does the Wrangler tank have internal baffles?

Supposedly, yes.

BIGglaSS · 05-07-2021, 09:18 PM

Well, #$@&. Others that have used the wrangler tank say that it is baffled. They're NOT!

Now what? Does it really need a baffle? Is there a way to add one?

jjzepplin · 05-08-2021, 02:13 PM

Quote:

Originally Posted by BIGglaSS

Well, #$@&. Others that have used the wrangler tank say that it is baffled. They're NOT!

Now what? Does it really need a baffle? Is there a way to add one?

Well no serious experience other than reading. Baffles help with hard cornering and keep gas in the pump when the level gets lower. Some GM pumps recirculate fuel into a sort of cup at the bottom of the pump assembly so that the pump will have access to fuel. Hope that makes sense.

LS short box · 05-08-2021, 04:56 PM

I've used non-baffled tanks on my early LS swaps. I just made sure I didn't run the tank too low. The down side to starving a fuel injected engine of fuel is they typically shut off like a light switch when the pick up is uncovered.

**clay68c10** · 05-09-2021, 10:55 AM

If the sender/pump assembly sits in a tub inside the tank bottom, then it’s fine. The tub will stay full of fuel. I’ve had my Jeep on plenty of off camber surfaces and it’s never starved for fuel.

BIGglaSS · 05-09-2021, 11:08 AM

There is no tub on the fuel sender. Originally, I have a camaro pump in a mustang tank that I got with this engine. However, I cant fit the filler tube under the bed floor. The reason I decided to switch to the wrangler tank was to use a remote fill tube mounted in the fender.

I'm thinking, either I use the mustang tank and raise the bed floor a few inches to cover the filler tube. Or, I attach a sump cup to the fuel sender.

I'm also thinking about using the evap system. I can't stand gas fumes in the garage. Also, with the mustang tank, and low filler, there is really no where to run a vent line higher than the tank.

Low Elco · 05-13-2021, 02:17 AM

Lots of folks have been known to fab a tub around the pickup sock and zip it on.

**michael bustamante** · 05-13-2021, 11:37 AM

i did this exactly and it works great
1992 wrangler tank and 87 blazer sender fits right in
great looking truck. im jealous. how did the harness come out?
i have an untouched one for dbw units if you need it to start over (green blue)

jjzepplin · 05-15-2021, 10:46 PM

Quote:

Originally Posted by michael bustamante

i did this exactly and it works great
1992 wrangler tank and 87 blazer sender fits right in
great looking truck. im jealous. how did the harness come out?
i have an untouched one for dbw units if you need it to start over (green blue)

Exactly what did you do?

04-13-2021, 09:35 PM	#26
BIGglaSS Registered User Join Date: May 2014 Location: ID Posts: 663	Re: Lets get this LS 5.3 running! I think I got this 95% figured out. Making another push to get this running soon! I am planning to do a Wrangler fuel tank and blazer sending unit. I see most guys use the EP381 fuel pump. However, this Delco HP 10004 sending unit comes with a fuel pump. https://www.rockauto.com/en/moreinfo...060579&jsn=481 Will this fuel pump work, or should I get the sender without pump and EP381? Thanks __________________ My museum of good intentions: 1957 3100 BBW restomod -- 1970 442 W30

04-15-2021, 12:13 PM	#28
BIGglaSS Registered User Join Date: May 2014 Location: ID Posts: 663	Re: Lets get this LS 5.3 running! I pulled the specs for what vehicles the EP381 pump goes in. The pump in the Delphi unit is for the same vehicles as the ep381. Same specs. 32 gph, 60 psi. Going to give it a try. __________________ My museum of good intentions: 1957 3100 BBW restomod -- 1970 442 W30

04-18-2021, 06:46 AM	#29
jjzepplin Registered User Join Date: Feb 2012 Location: Ruskin Florida Posts: 4,566	Re: Lets get this LS 5.3 running! Does the Wrangler tank have internal baffles? __________________ 70 swb 4x4 406sbc 700r4 203/205 d60/14blt locker yadda yadda http://67-72chevytrucks.com/vboard/s...88#post6935688 Yeller 72 Blazer 2wd conversion project "No Daggum Money" http://67-72chevytrucks.com/vboard/s...d.php?t=550804 LS1-T56 3.73 LSD super budget build Blanco-2014 Sierra SWB https://67-72chevytrucks.com/vboard/...d.php?t=810350

05-07-2021, 09:18 PM	#31
BIGglaSS Registered User Join Date: May 2014 Location: ID Posts: 663	Re: Lets get this LS 5.3 running! Well, #$@&. Others that have used the wrangler tank say that it is baffled. They're NOT! Now what? Does it really need a baffle? Is there a way to add one? __________________ My museum of good intentions: 1957 3100 BBW restomod -- 1970 442 W30

05-08-2021, 04:56 PM	#33
LS short box Registered User Join Date: Jun 2015 Location: Carlos MN Posts: 2,131	Re: Lets get this LS 5.3 running! I've used non-baffled tanks on my early LS swaps. I just made sure I didn't run the tank too low. The down side to starving a fuel injected engine of fuel is they typically shut off like a light switch when the pick up is uncovered.

04-15-2021, 10:22 AM	#27
prodjay10 Registered User Join Date: Jun 2016 Location: Phoenix AZ Posts: 429	What kind of pressure is that putting out? If it’s for an ls based vehicle it’ll prolly work. Just gotta make sure it’s the right depth. Posted via Mobile Device

05-09-2021, 10:55 AM	#34
clay68c10 Senior Member Join Date: Aug 2004 Location: Centennial, CO Posts: 2,988	Re: Lets get this LS 5.3 running! If the sender/pump assembly sits in a tub inside the tank bottom, then it’s fine. The tub will stay full of fuel. I’ve had my Jeep on plenty of off camber surfaces and it’s never starved for fuel. __________________ ClusterTruck: 68 C10 Bought in 89, wrecked in 03. Slow low $ rebuild started '17. 6.0 & TKO http://67-72chevytrucks.com/vboard/s...d.php?t=788602 93 K1500 Short Step, 350, NV4500, EBL flash ECU. Vortec heads & roller cam someday... 05 Jeep Wrangler Unlimited. 3” lift & 6-speed 02 E320 the insurance total “free car” 13 Tahoe LTZ

05-09-2021, 11:08 AM	#35
BIGglaSS Registered User Join Date: May 2014 Location: ID Posts: 663	Re: Lets get this LS 5.3 running! There is no tub on the fuel sender. Originally, I have a camaro pump in a mustang tank that I got with this engine. However, I cant fit the filler tube under the bed floor. The reason I decided to switch to the wrangler tank was to use a remote fill tube mounted in the fender. I'm thinking, either I use the mustang tank and raise the bed floor a few inches to cover the filler tube. Or, I attach a sump cup to the fuel sender. I'm also thinking about using the evap system. I can't stand gas fumes in the garage. Also, with the mustang tank, and low filler, there is really no where to run a vent line higher than the tank. __________________ My museum of good intentions: 1957 3100 BBW restomod -- 1970 442 W30

05-13-2021, 02:17 AM	#36
Low Elco Registered User Join Date: Apr 2003 Location: Indep, MO Posts: 5,893	Re: Lets get this LS 5.3 running! Lots of folks have been known to fab a tub around the pickup sock and zip it on. __________________ Boppa's Old Yeller Truck Build, Old Yeller's New Heart! Project Buzz Bomb Flyin' Low!

05-13-2021, 11:37 AM	#37
michael bustamante Senior Member Join Date: Sep 2007 Location: Albuquerque NM Posts: 7,862	Re: Lets get this LS 5.3 running! i did this exactly and it works great 1992 wrangler tank and 87 blazer sender fits right in great looking truck. im jealous. how did the harness come out? i have an untouched one for dbw units if you need it to start over (green blue) __________________ 1967custom



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