TBI to TPI fuel pump? - Pirate4x4.Com : 4x4 and Off-Road Forum

pilothillcrawler · 11-18-2007, 11:55 AM

I am switching from a TPI 350 to a TBI 350 and need to know if I need to get a different fuel pump or will the fuel pump that is already in there for the TPI will work for the new TBI system.

Urban Wheeler · 11-18-2007, 12:00 PM

TPI needs about 50 psi, TBI needs about 12-15.

WhatsStuckK5 · 11-18-2007, 12:02 PM

Quote:

Originally Posted by pilothillcrawler

I am switching from a TPI 350 to a TBI 350 and need to know if I need to get a different fuel pump or will the fuel pump that is already in there for the TPI will work for the new TBI system.

depending on the sending unit you are using, you can get a walbro pump for about 110$ that will fit like stock and is 255 lph and 100 psi. lemme see what i got from summit...

http://store.summitracing.com/partde...0&autoview=sku thats the one i got for my blazer with the vortec swap. should work fine on a tpi.

Urban Wheeler · 11-18-2007, 12:06 PM

Quote:

Originally Posted by WhatsStuckK5

depending on the sending unit you are using, you can get a walbro pump for about 110$ that will fit like stock and is 255 lph and 100 psi. lemme see what i got from summit...

http://store.summitracing.com/partde...0&autoview=sku thats the one i got for my blazer with the vortec swap. should work fine on a tpi.

No, he's going the other way.

Why are you ditching TPI?

Bill usn-1 · 11-18-2007, 01:54 PM

The pump makes no difference as long as it produces enough pressure.
The regulator is in the throttlebody not in the pump.

The inline pumps I recommend will produce 95psi.
But the regulator maintains the required 13psi for TBI.

I recommend you spend a lot more time reading the FAQ in the injection forum in my sig.

BTW, the type of ign switch has nothing to do with wiring a FI system!!

pilothillcrawler · 11-18-2007, 05:30 PM

Quote:

Originally Posted by Urban Wheeler

Why are you ditching TPI?

The motor that was in with the TPI had a really bad squel and a small knock, I got a deal on a FREE TBI that was put into a truck new about two years ago, the truck got wrecked, the motor has only about 12000 miles on it and is in perfect condition.

Thanks BILL or the info that is what I was hoping to hear. Will defintley check the links in your sig thanks.

Bubba_Jeep · 11-18-2007, 07:09 PM

Why don't you put the TPI stuff (heads, and injection) on the TBI block? It should all bolt on with no problem.
The TPI block is roller cam/lifters, with good heads while the TBI block is most probably low performance heads and a flat tappet cam.
I tried using my stock Jeep 4.0L in-tank pump to run my TBI. The regulator would not reduce the pressur adequately, causing the engine to run way rich. I was forced to install a stock TBI pump.

Jorge Meza · 11-18-2007, 08:59 PM

Pilot... you really want to keep your TPI system. It doesn't make sense to go back to a TBI from a TPI.

pilothillcrawler · 11-18-2007, 10:05 PM

I am not going from tpi back to tbi I am changing motors completely.
yeah I thought about swapping the tpi stuff onto the tbi block, but I thought that I would just leave the TBI motor all together, especially since it is such a "new" motor with only about 12000 miles on it.

Odin K30 · 11-23-2007, 05:05 PM

I hate to gang up on ya. But I have to agree with everyone else. TPI is about 100 times better than TBI. IMO take the time to swap the TPI parts onto your new engine. You will thank us later.

florida4x4 · 11-24-2007, 06:43 AM

all you have to do is swap manifolds. not like you got to pull the heads or crank... lol.

pyrocrat · 11-24-2007, 11:17 AM

Unless your TPI engine is very early ,( with center 2 bolts at the same angle as the other 4 on each side) , your TBI mani will bolt straight on with no probs .If you do have early mani , I've had good luck using a 3/8 drill bit and hand machining the bolt holes to match later heads and then making tapered washers to match mani .

Also switch knock sensor or sensors . If you have aluminum heads on the TPI eng , switch em to TBI block .

In the stock chevy fuel pump pick up ,a stock TPI or TBI pump will simply interchange .

IMO ,a gasket kit is about same price as a cheap fuel pump , or even cheaper , and TPI engine power is worth more then a couple of hours changing heads to retain TPI ,and all 100% of TPI wiring will have to be changed ,also.

Corvette engine always sounds cooler .

11-18-2007, 11:55 AM	#1 (permalink)
pilothillcrawler Registered User Join Date: Jul 2006 Member # 76609 Location: Pilot Hill, CA now Woodland, CA; 1 hour further from the con :( Posts: 507	TBI to TPI fuel pump? I am switching from a TPI 350 to a TBI 350 and need to know if I need to get a different fuel pump or will the fuel pump that is already in there for the TPI will work for the new TBI system. __________________ YJ on custom frame 350 sm465 twin stick Dana 300, 35 Spline 60's f/r, arbs f/r, hydro, on 42" IROKS

11-18-2007, 01:54 PM	#5 (permalink)
Bill usn-1 Registered User Join Date: Jun 2003 Member # 20423 Location: Finally back in the US-Wdby Is, WA Posts: 1,066	The pump makes no difference as long as it produces enough pressure. The regulator is in the throttlebody not in the pump. The inline pumps I recommend will produce 95psi. But the regulator maintains the required 13psi for TBI. I recommend you spend a lot more time reading the FAQ in the injection forum in my sig. BTW, the type of ign switch has nothing to do with wiring a FI system!! __________________ Bill USN-1 EFI Moderator at http://www.binderplanet.com

11-18-2007, 07:09 PM	#7 (permalink)
Bubba_Jeep Registered User Join Date: Oct 2004 Member # 37184 Location: Santa Barbara, CA Posts: 1,323	Why don't you put the TPI stuff (heads, and injection) on the TBI block? It should all bolt on with no problem. The TPI block is roller cam/lifters, with good heads while the TBI block is most probably low performance heads and a flat tappet cam. I tried using my stock Jeep 4.0L in-tank pump to run my TBI. The regulator would not reduce the pressur adequately, causing the engine to run way rich. I was forced to install a stock TBI pump. __________________ 88XJ, Chevy 5.7L, Edelbrock MPFI, NV4500, Atlas, D44's, high steer, ARB's, 7" custom semi long-arm 3 or 4-link lift, BFG 33x12.5-15's. Last edited by Bubba_Jeep; 11-18-2007 at 07:13 PM.

11-18-2007, 10:05 PM	#9 (permalink)
pilothillcrawler Registered User Join Date: Jul 2006 Member # 76609 Location: Pilot Hill, CA now Woodland, CA; 1 hour further from the con :( Posts: 507	I am not going from tpi back to tbi I am changing motors completely. yeah I thought about swapping the tpi stuff onto the tbi block, but I thought that I would just leave the TBI motor all together, especially since it is such a "new" motor with only about 12000 miles on it. __________________ YJ on custom frame 350 sm465 twin stick Dana 300, 35 Spline 60's f/r, arbs f/r, hydro, on 42" IROKS

11-23-2007, 05:05 PM	#10 (permalink)
Odin K30 Bad Doctor Join Date: Feb 2007 Member # 86878 Location: South of Heaven Posts: 2,465	I hate to gang up on ya. But I have to agree with everyone else. TPI is about 100 times better than TBI. IMO take the time to swap the TPI parts onto your new engine. You will thank us later. __________________ -Vinny -from Elizabeth Nobody cares about your rigs specs... "Me too" short Crew build /forum/chevy/994394-odins-me-too-short-crew-build.html

11-18-2007, 08:59 PM	#8 (permalink)
Jorge Meza Trapped in the 80's Join Date: Mar 2006 Member # 70340 Posts: 1,366	Pilot... you really want to keep your TPI system. It doesn't make sense to go back to a TBI from a TPI.

11-24-2007, 06:43 AM	#11 (permalink)
florida4x4 Beaver Pleaser Join Date: Sep 2002 Member # 13645 Location: home of the wayward dirt bike Posts: 1,419 Blog Entries: 1	all you have to do is swap manifolds. not like you got to pull the heads or crank... lol. __________________ 1972 GMC Submarine 383 / TH350 / 203D-NP205 / D60 / 14FF / 42's on Stazworks / heavy foote / four eyez Inclined to brute force attack a 70* incline with a Quadrajet 1997 GMC K3500 Suburban 454 / 4L80E / HP60 SAS / PROJECT TOWHOE

11-24-2007, 11:17 AM	#12 (permalink)
pyrocrat Registered User Join Date: Jul 2006 Member # 75018 Location: socal Posts: 330	Unless your TPI engine is very early ,( with center 2 bolts at the same angle as the other 4 on each side) , your TBI mani will bolt straight on with no probs .If you do have early mani , I've had good luck using a 3/8 drill bit and hand machining the bolt holes to match later heads and then making tapered washers to match mani . Also switch knock sensor or sensors . If you have aluminum heads on the TPI eng , switch em to TBI block . In the stock chevy fuel pump pick up ,a stock TPI or TBI pump will simply interchange . IMO ,a gasket kit is about same price as a cheap fuel pump , or even cheaper , and TPI engine power is worth more then a couple of hours changing heads to retain TPI ,and all 100% of TPI wiring will have to be changed ,also. Corvette engine always sounds cooler .

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