Whilst I have all the wiring loom out of my L31 SL/R Im wondering if I should install wiring/relay for an electric fuel pump? How do the mech fuel pumps go in terms of reliability, flow and pressure compared with a elec pump these days?
Mech Fuel Pump Vs Elec Fuel Pump
Started by
hanra
, Jun 03 2011 12:57 PM
17 replies to this topic
#1
hanra
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Posted 03 June 2011 - 12:57 PM
#2
_fatlh5000_
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Posted 03 June 2011 - 01:04 PM
Whilst I have all the wiring loom out of my L31 SL/R Im wondering if I should install wiring/relay for an electric fuel pump? How do the mech fuel pumps go in terms of reliability, flow and pressure compared with a elec pump these days?
Hanra,
I spoke to Burwood Carburettor(Sydney) a while ago, who are reputable, and have been around for deacdes.
I was having a few issues with my 327 chev running a bit rich. Tim from Burwood carburettor asked some specs of my car, and when I told him that I had a Holley Blue pump fitted to my mild 327, he was quite suprised.
His oppinion was for a stockish engine, fun on the street that the mechanical fuel pump is the way to go.
Also- the holley Blue is quite noisy.
#3
MRLXSS
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Posted 03 June 2011 - 01:07 PM
What Carby are you running?
I had a good chat with my engine builder about my new engine... He said that if I wanted to run my old Quaddy, I could... But would need a Elec fuel pump to supply it... But if I ran a Holley with the bigger fuel bowls... The Hi-Volume Mechanical Pump should be up to the job no problems...
I chose to get a bigger carby to stay with the mechanical pump.
I had a good chat with my engine builder about my new engine... He said that if I wanted to run my old Quaddy, I could... But would need a Elec fuel pump to supply it... But if I ran a Holley with the bigger fuel bowls... The Hi-Volume Mechanical Pump should be up to the job no problems...
I chose to get a bigger carby to stay with the mechanical pump.
#4
_Big T_
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Posted 03 June 2011 - 02:13 PM
Is there an easy way to tell what sort of pump is on a 308? As in, how would one identify a Hi Vol pump as opposed to a standard one?
#5
hanra
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Posted 03 June 2011 - 03:10 PM
Im currently running a 650DP spreadbore, and dont intend to go any bigger then that. I guess the opinion is to stay with a mech pump. I might just run the wiring to the rear of the car anyways. Just in case......
#6
View GaragePosted 03 June 2011 - 05:15 PM
With the Holley the mechanical pump should be fine, the poor old Quadrajet is great in many respects but not blessed with a large fuel bowl so needs a pump that can keep up under full acceleration hence the electric pumps many use
#7
_RTS Guy_
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Posted 03 June 2011 - 05:28 PM
With the Holley the mechanical pump should be fine, the poor old Quadrajet is great in many respects but not blessed with a large fuel bowl so needs a pump that can keep up under full acceleration hence the electric pumps many use
spot on
#8
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Posted 03 June 2011 - 11:14 PM
Is there an easy way to tell what sort of pump is on a 308? As in, how would one identify a Hi Vol pump as opposed to a standard one?
err no..that is if its the original holden rebuildable type..you can buy kits for em both standard(4psi) and hi pressure(7psi) the difference is the spring
the after market sealed type pump is not rebuildable ie: throw away
#9
mr5000
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Posted 04 June 2011 - 08:19 AM
i got A ac delco hi vol fuel pump from rarespares for around 80- bucks give that a go
#10
_darrenmark1_
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Posted 04 June 2011 - 10:39 AM
i bought something like this shiney one, altho the chrome on mine is much better, then got a kit and re built it, cheap enough works great.
http://www.ebay.com....=item33680d6b3b
http://www.ebay.com....=item33680d6b3b
#11
_chrome yella_
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Posted 04 June 2011 - 12:07 PM
mech pumps are safer, if the engine stops so does the fuel, in an accident such as you are unable to turn the ignition off, the electric pump will keep pressure up.
i have a clay smith hi volume mech pump for my s/b chev and its capable of feeding 1300hp. so there are some great mech pumps out there
i have a clay smith hi volume mech pump for my s/b chev and its capable of feeding 1300hp. so there are some great mech pumps out there
#12
Lima31
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Posted 04 June 2011 - 12:44 PM
I would fit an electric unit with a oil pressure safety switch - for security as you could run an independent hidden switch just for the pump. Whilst the engine can start without the pump running, it usually dies in the time it gets on the road, and from the stories I've heard once they are in a public space without a running car and considering how long it might take to diagnose no fuel and power the pump, they usually bail.
#13
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Posted 04 June 2011 - 02:03 PM
i have thought about fitting a electric pump to my ss hatch which is soon to have a new 308 in it..but as we probly all know theres bugga all room near the tank with full exhaust standard tank etc
i dont want to cut holes in the floor or mount it in the boot area..so will use the mech hi pressure one i have
have seen the CARTER electric silver series looks quiet small sized an they have a good rep..so may look at fitting that at some stage unless someone else has a betta idea
cheers
i dont want to cut holes in the floor or mount it in the boot area..so will use the mech hi pressure one i have
have seen the CARTER electric silver series looks quiet small sized an they have a good rep..so may look at fitting that at some stage unless someone else has a betta idea
cheers
#14
EunUCh
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Posted 04 June 2011 - 07:42 PM
did Mr.P.Brock use an electric pump on the ones he raced? Maybe convert it to alcohol that needs round about 2-2.5 times more fuel and pour vodka in the tank
premium of course?
premium of course?
#15
_LH SLR 3300_
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Posted 07 June 2011 - 04:51 PM
My 304 has a mechanical pump fitted but it was fed fuel through a Holley Blue regulator. I thought this was unusual & then someone pointed out that the aftermarket throw away type mech pumps can fluctuate pressure up to 10psi causing overfueling so the regulator is a safeguard to maintain constant even pressure. Anyone else come across this?
#16
Posted 07 June 2011 - 05:25 PM
I doubt the mechanical pump can deliver much more than 10psi all up...? It would have to fluctuate due to the nature of the mechanical pump operation, a regulator would limit the maximum (only an issue if its lifting the needle off the seat) but I can't see how it would even it out much. The carb fuel bowl should provide constant fuel delivery regardless of how it is filled (within reason).
#17
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Posted 07 June 2011 - 07:09 PM
My 304 has a mechanical pump fitted but it was fed fuel through a Holley Blue regulator. I thought this was unusual & then someone pointed out that the aftermarket throw away type mech pumps can fluctuate pressure up to 10psi causing overfueling so the regulator is a safeguard to maintain constant even pressure. Anyone else come across this?
this is exactly what i did..i have the reg right next to the carb..one outlet to rear bowl an one to the front..mainly to even the flow and pressure to both fuel bowls..and i have a hi pressure original mech pump
#18
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Posted 07 June 2011 - 08:24 PM
I would fit an electric unit with a oil pressure safety switch - for security as you could run an independent hidden switch just for the pump. Whilst the engine can start without the pump running, it usually dies in the time it gets on the road, and from the stories I've heard once they are in a public space without a running car and considering how long it might take to diagnose no fuel and power the pump, they usually bail.
Or a LPG safety switch.
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