TBI Fuel Pump Question - JeepForum.com
 
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post #1 of 8 Old 09-08-2013, 02:04 PM Thread Starter
ericksin
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TBI Fuel Pump Question

I need a new 20-psi fuel pump for my Holley TBI system, my question is the flow rate.

One pump I'm looking at has a flow rate of 23gph, 20-psi for $50. the other is 50gph, 20-psi for $140. Does any one know what a TBI system needs as far as gph? and has any one replaced the TBI pump with an aftermarket pump?


My Holley Manual says it needs a minimum of 12-psi to operate properly but doesn't say anything about the gph.....


**** it, GAS IT!
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post #2 of 8 Old 09-08-2013, 02:45 PM
jeepwhore
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What are the outlet sizes on the two? Wouldn't a pump rated for twice the flow at the same psi have to have an outlet twice as large? That might help you figure out which one you need as last I checked a Jeep doesn't need a 3/4" fuel line.

**edit** Nevermind, been a while since I was last in school.

'84 CJ-7: Yota axles (spartan locked front, e-locked rear) 4" BDS, 1" Daystar & 3/8" shackle lifts, 35" X-Terrains on steelies, YJ Tub & family roll bar, heater blower upgrade, 4.2L w/MC2100 & Team Rush, Warn 8274. Rebuilt 4.2/4.0 hybrid, AX15 and twin sticks/clocking ring waiting to go in.

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post #3 of 8 Old 09-08-2013, 02:55 PM
Tyger78
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Just a thought, Your TBI system has a fuel pressure regulator yes? If the system states that it requires a minimum of 12 psi, to me, that suggests that it also regulates it to 12 psi if it supplied with more.

So..... as long as you supply the TBI system with it's minimum (12 psi), the extra psi is going to be diverted and regulated back anyhow.

In theory of course, the only question would be "which one do you want, and would you have to adapt the inlet/outlet".

Of course, this is just me throwing some pennies around, as I'm no pro.

I've done lost my mind...... mind.... mind.... mind..... mind..... what a silly word.
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post #4 of 8 Old 09-08-2013, 03:23 PM Thread Starter
ericksin
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Yea... the manual says to set your regulator to 15-psi..... so I figured the cheaper pump should be ok, both pumps have a 3/8 in/outlet...... just checking to see if there something not seeing.

Thank

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post #5 of 8 Old 09-08-2013, 03:53 PM
Toine
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Yes it will make a huge difference, especially at half till full trottle, you need that 50 gallon flow.
I have very good experience with the Airtex pump for TBI, rated @ 17psi, #E8094

cj7 305 V8 TH-700R4 D300 lomax, front & rear D44 4.88 with detroit lockers, 4'' skyjacker lift, Doetsch Baja Ryders & u-bolt flip kits
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post #6 of 8 Old 09-08-2013, 06:46 PM Thread Starter
ericksin
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Well I was about to order the cheep pump till I seen your info.... I found the Airtex E8094 Electric Fuel Pump like you posted for $85.13 free shipping on Amazon.... what can you tell me about your experience with TBI's?




Quote:
Originally Posted by Toine View Post
Yes it will make a huge difference, especially at half till full trottle, you need that 50 gallon flow.
I have very good experience with the Airtex pump for TBI, rated @ 17psi, #E8094

**** it, GAS IT!
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post #7 of 8 Old 09-08-2013, 06:52 PM Thread Starter
ericksin
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just found it on ebay for 71.99 free shipping

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post #8 of 8 Old 09-10-2013, 05:20 AM
Toine
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My experience with the TBI is that it need really its pressure and flow for proper working injectors, this Airtex pump is a lot bigger and heavier than those cheap 14-15 psi pumps.
They can be loud when hot, but have a long life - mine run for 7 years now with 30.000 miles - still strong - I have one spare with me in case.
Go for it you would'n be dissapointed.

cj7 305 V8 TH-700R4 D300 lomax, front & rear D44 4.88 with detroit lockers, 4'' skyjacker lift, Doetsch Baja Ryders & u-bolt flip kits
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