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Old 06-26-2019, 11:36 PM   #1
sugar ray
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Is their such a thing as a high performance fuel pump for the 3400?

Quiet place these days as fewer and fewer GA’s exist on the roads.
Anyways......is there such a thing as a high performance fuel pump for the 3400??

I’m original owner of my 02SE. Loads of high performance mods
-removed Cat
-headers
-ported heads
-air intake
-PCM tune

cosmetically she’s got the fancy hood and double post mirrors

My minor dilemma, it runs like a dream, however when it’s time to have fun at wide open throttle I get a hesitation. If I leave my foot to the floor it will fight through the hesitation and resume but the hesitation is there. Again, only at wide open throttle.
Same results in open or closed loop mode. I have loads of good spare working parts. MAF sensor, coil packs, TPS etc..... so trouble shooting the easy stuff first
Brand new K&N fuel and Air filter. o2 solid as well It really feels like it’s starving for fuel just for that hesitation then resumes. Next step will be to hook up a live data program while running WOT to confirm what kind of pressure I’m getting during WOT

Regulator is new and good as well.no vacuum leaks exist. Plugs, wires spot on as well After eliminating spark, and air, only leaves me with fuel.

My current Pump is a Herko about 5 years old. If it turns out my pump is falling flat on its face at WOT what can anyone recommend? I’m a fan of BOSCH products

I assume there is no such thing as a so called “high performance” pump for the 3400?
Lots of options, both cheap and not so cheap
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Old 06-26-2019, 11:38 PM   #2
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Old 06-27-2019, 06:30 PM   #3
Madness10
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Quote:
Originally Posted by sugar ray View Post
Quiet place these days as fewer and fewer GAís exist on the roads.
Anyways......is there such a thing as a high performance fuel pump for the 3400??

Iím original owner of my 02SE. Loads of high performance mods
-removed Cat
-headers
-ported heads
-air intake
-PCM tune

cosmetically sheís got the fancy hood and double post mirrors

My minor dilemma, it runs like a dream, however when itís time to have fun at wide open throttle I get a hesitation. If I leave my foot to the floor it will fight through the hesitation and resume but the hesitation is there. Again, only at wide open throttle.
Same results in open or closed loop mode. I have loads of good spare working parts. MAF sensor, coil packs, TPS etc..... so trouble shooting the easy stuff first
Brand new K&N fuel and Air filter. o2 solid as well It really feels like itís starving for fuel just for that hesitation then resumes. Next step will be to hook up a live data program while running WOT to confirm what kind of pressure Iím getting during WOT

Regulator is new and good as well.no vacuum leaks exist. Plugs, wires spot on as well After eliminating spark, and air, only leaves me with fuel.

My current Pump is a Herko about 5 years old. If it turns out my pump is falling flat on its face at WOT what can anyone recommend? Iím a fan of BOSCH products

I assume there is no such thing as a so called ďhigh performanceĒ pump for the 3400?
Lots of options, both cheap and not so cheap
There's no HP fuel pumps for these cars, unless you want to go with a sump style tank or run an external pump, but both will require heavy mods. Your WAI( air intake) is sucking in a lot of hot air and robbing your motor of HP. That could also be part of the problem. Your tune might be part of the problems also. Hard to diag over the web. You would have to put a live scanner on it and record the readings.
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Old 06-28-2019, 08:56 AM   #4
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Look into your tune before you go about changing parts.
The stock fuel pump is fine for cars with even heavy bolt-ons, and forced induction cars could get by with just larger injectors (and tuning) up to around 300WHP.
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Old 06-29-2019, 03:43 PM   #5
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Thanks gents!

Ya I have 2 PCMS
One is stock flash that I used to drive around in while my pcm was being mailed away for the tune

The second PCM I have is the tune

BOTH PCMs are giving the SAME result regarding that hesitation.
Pretty sure I can rule that one out
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Old 06-30-2019, 02:21 PM   #6
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Quote:
Originally Posted by Madness10 View Post
There's no HP fuel pumps for these cars, unless you want to go with a sump style tank or run an external pump, but both will require heavy mods. Your WAI( air intake) is sucking in a lot of hot air and robbing your motor of HP. That could also be part of the problem. Your tune might be part of the problems also. Hard to diag over the web. You would have to put a live scanner on it and record the readings.
Not true. Walbro makes a unit that works in our stock tanks. It's a 255 LPH unit. Several F-body stores sell them with kits that make them work in the stock fuel bucket with the venturi system, which exactly the same type of installation in our fuel tank. Several people here have installed these.

http://www.ws6project.com/user_stor/...fit-fuel-pump/

That said, you are definitely not at a HP level that would require a higher flow pump. I'd get some scan data and see what your air/fuel ratios look like, what the injector pulse width is, and what other sensors are doing (MAF, MAP, O2, etc). These engines don't have fuel pressure sensors, so you won't be able to log that unless you add an aftermarket gauge or sensor with an analog output. If the regulator is good, and your fuel filter isn't too old, I'd say pressure probably isn't the issue. If they stock pump was failing, you'd more likely see a drop off that would continue above a certain rpm rather than just a hesitation.
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Old 07-01-2019, 07:48 AM   #7
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Originally Posted by AaronGTR View Post
Not true. Walbro makes a unit that works in our stock tanks. It's a 255 LPH unit. Several F-body stores sell them with kits that make them work in the stock fuel bucket with the venturi system, which exactly the same type of installation in our fuel tank. Several people here have installed these.

http://www.ws6project.com/user_stor/...fit-fuel-pump/
Thanks for the correction. I wasn't aware of such pump.
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Old 07-01-2019, 05:27 PM   #8
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Great topic to bring back some OGs
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Old 07-11-2019, 09:20 AM   #9
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Great topic to bring back some OGs
I do love a good fuel pump discussion.
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