Fuel pump Question.
Thread Starter
Registered User
Joined: Jan 2014
Posts: 7
Likes: 0
From: Agawam,Mass.
Fuel pump Question. I have a stock tank in my 81 Camaro and I was wondering if I could run a in-line fuel pump to the new ls setup. From what Ive read you need about 58-60 psi for the injectors. What pump does that? I've seen a lot of them and they are 14 psi and like 300gph.... great for a carb setup but not for the efi. I have a 5.3 out of a truck so what would be a good injector # to go with as well. Stock everything except I'm going with a ls1 or ls6 intake for hood clearance. Thanks again. You guys are awesome. Just sayin.
On The Tree
Joined: Nov 2010
Posts: 114
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From: Fairview , MO
I use the walboro 255 inline pump from summit. I use one on my chevelle with a stock tank without any problems. Also on a 66 chevy truck with stock tank behind the seat and a 65 truck with a stock blazer tank under the bed. I think the part number is vpn-gsl-392. As far as injectors goes that i dont know right off hand. However the car injectors and truck injectors take different plugs. Hope this helps.
TECH Enthusiast
Joined: Mar 2012
Posts: 728
Likes: 3
I have read a lot about the walbro inline pumps but I heard their noisy. In tank seems to be the best route from what I've read but it's more $. I'm trying to decide on my fuel system also, 5.3 into a 75 Camaro.
Some inline pumps are noisier than others but in my experience internal and external Walbro's aren't excessively noisy unless they are bad. In tank is the way to go if you have the room and ability from a space, noise, reliability and fuel pickup considerations. Most non-EFI tanks aren't baffled which allows the fuel to slosh during rapid directional changes (acceleration, braking and cornering).
Last edited by gofastwclass; Jan 30, 2014 at 04:06 PM.
On The Tree
Joined: Nov 2010
Posts: 114
Likes: 0
From: Fairview , MO
On my chevelle at idle the exhaust is so quite you can hear the injectors clicking and you cant hear the pump at all. Its super quite. I havent had any noise issues with these pumps at all. My cousin had a noisey one but he changed where he mounted it at and now you can barely hear it.
Some of the biggest problems dealing with conversions from Efi to carb or vice-verse are
A carb low pressure system requires high volume low pressure
a late model efi requires 40-80psi depending on what set up you are running high pressure lower volume
you did not mention what you were doing for pickup rails regulator excreta
If you want it to be reliable you need to plumb the system with the proper size lines fittings and return line set-up. This will keep the pump cool, all the injectors will see full pressure before you return and the voltage will be more consistent.
one of the troubles with inline pumps is the inability for the pump to cool.(depending on the rest of the system of course) You will also see the current demand for the pump to fluctuate quite a bit depending on heat and demand.
A carb low pressure system requires high volume low pressure
a late model efi requires 40-80psi depending on what set up you are running high pressure lower volume
you did not mention what you were doing for pickup rails regulator excreta
If you want it to be reliable you need to plumb the system with the proper size lines fittings and return line set-up. This will keep the pump cool, all the injectors will see full pressure before you return and the voltage will be more consistent.
one of the troubles with inline pumps is the inability for the pump to cool.(depending on the rest of the system of course) You will also see the current demand for the pump to fluctuate quite a bit depending on heat and demand.
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