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Username Post: Holley Sniper EFI fuel pump?        (Topic#365935)
1carguy 
Poster
Posts: 59

Reg: 11-30-08
07-28-21 02:12 PM - Post#2824054    

I'm about to buy the Holley Sniper EFI to install on my '70 El Camino. It runs a mid '80s 350, bored .060 over, about 300hp, Comp Cam 230-236, 202 heads, Edelbrock Performer intake, and headers. Question: which fuel pump set up should I use? I've heard of complaints about the Holley pump being very loud. That would drive me crazy. Are there other outside of tank fuel pumps that aren't as noisy? Btw, just buying the Sniper is stretching my hot rod budget so I can't get too carried away.



 




Rick_L 
Member #409
Posts: 27938
Rick_L
Loc: Katy, Tx, USA
Reg: 07-06-00
07-28-21 06:02 PM - Post#2824066    
    In response to 1carguy

I don't know what an El Camino uses for a fuel tank, but the best way to go is an in tank pump. If the El Camino uses a passenger car tank there are choices out there for a complete in tank setup, or maybe someone makes an EFI tank for an El Camino.

At 300 hp, you don't need anything high output. A Walbro 255 l/hr pump will be sufficient and won't be noisy if in the tank.

Any external pump is going to be a compromise - a big one.



 
65_Impala 
Very Senior Member
Posts: 4850

Reg: 12-29-02
07-28-21 06:21 PM - Post#2824067    
    In response to 1carguy

It has the big flat tank like a Chevelle, right? With that type of tank you'll be disappointed in any setup that doesn't sump the pump. A carburetor can get away with sucking a bit of air because the float bowls give a reserve. EFI will stumble if any air at all makes it to the pickup.

But, if you need a pump just to get it going then look for a 250lpm 60psi pump. You could try to use the external frame pump from a ~90 F150. I think it has a metric thread on the outlet but if you're handy then you can make it work. I have run one, it fed a warmed over LT1, which should have been in the 350-37hp range. It wasn't noisy at all. But then, the low pressure carburetor piston pumps are the ones that really make a lot of noise, not the high pressure gear rotor pumps.



 
Hrm2k 
Platinum Supporting Member
Posts: 12
Hrm2k
Loc: Baltimore county MD
Reg: 07-05-21
07-29-21 04:00 AM - Post#2824088    
    In response to 65_Impala

When I bought my Holley Sniper unit, it came with a pump made for the system. The only time you hear the pump is when you first go to start the car.
While an intank pump would be the best way, the Sniper pump is a close second.
My 65 V8 Corvair has a fuel cell in the front ( Corvair trunk )with the pump mounted almost under the passengers side footwell. The sniper pump is no where near as loud as the Holley Red pump that fed the carbs before the sniper unit was installed.
Since you mount the pump as close to the tank and your El Camino has a tank at the back, there should be no noise problem at all

65 V8 Corvair
64 Cadillac Survivor
1917 Ford Roadster Pick Up


 
1carguy 
Poster
Posts: 59

Reg: 11-30-08
07-29-21 06:09 AM - Post#2824098    
    In response to Hrm2k

Thanks for the input. It runs a stock tank which is a big flat tank in the rear. I've read several cases where the Holley fuel set up using a fuel pump located outside the tank can be very noisy, however many claim it's not the pump's fault but cavitation or air in the fuel line between the pump and tank. I guess these pumps are pushers and don't like to pull fuel and will howl when they have to work too hard. They say finding the right location and set up is important for quiet operation.




 
65_Impala 
Very Senior Member
Posts: 4850

Reg: 12-29-02
07-29-21 06:09 PM - Post#2824132    
    In response to 1carguy

I didn't think to mention it, but if you can replace the sock on the pickup with a Holley Hydromat then sucking air shouldn't be nearly as bad an issue.



 
Rick_L 
Member #409
Posts: 27938
Rick_L
Loc: Katy, Tx, USA
Reg: 07-06-00
07-29-21 06:49 PM - Post#2824137    
    In response to 65_Impala

Thing is, a Holley hydromat + a new external pump is probably more $$ than a new EFI tank and in tank pump and will be noisier.



 
Hrm2k 
Platinum Supporting Member
Posts: 12
Hrm2k
Loc: Baltimore county MD
Reg: 07-05-21
07-30-21 04:13 AM - Post#2824151    
    In response to 1carguy

The sniper fuel pump is a pusher unit.

65 V8 Corvair
64 Cadillac Survivor
1917 Ford Roadster Pick Up


 
65_Impala 
Very Senior Member
Posts: 4850

Reg: 12-29-02
07-30-21 06:29 AM - Post#2824157    
    In response to Rick_L

Not quite, but could be close enough to justify the EFI tank. A Tanks Inc tank and pump and pickup run >$500 and a Hydropmat and external pump should be <$300. He could also install the pump now and the Hydromat later.

Could also get a new standard tank and a GM OEM canister and mate the two together. I haven't seen any aftermarket in tank pump setup that would match a GM canister except maybe the Hydromat.

I got the external Ford OEM pump from the junk yard for $5 and it worked for years so there are ways to do it cheap if you're motivated enough.



 
61ragtop 
Member
Posts: 701

Age: 45
Loc: Langley B.C. Canada
Reg: 07-30-03
09-27-21 08:09 PM - Post#2828150    
    In response to 65_Impala

https://www.holley.com/products/fuel_systems /fuel_...



 
65_Impala 
Very Senior Member
Posts: 4850

Reg: 12-29-02
09-29-21 03:32 AM - Post#2828237    
    In response to 61ragtop

I would think this one is more likely to fit a '70 El Camino

https://www.holley.com/products/fuel_systems /fuel_...





 
toro455 
"6th Year" Silver Supporting Member
Posts: 656
toro455
Loc: Western NY
Reg: 06-15-02
12-24-21 10:22 AM - Post#2833171    
    In response to 65_Impala

I installed the Sniper in my 71 Chevelle this past fall. I just caught this thread. The hydramat is very expensive but I did end-up using one. The biggest challenge for the Chevelle is the sending unit head is just a little larger than a golf ball. I started with a Lieland Global sending unit and I used a pump purchased directly from the Walbro site. Holley makes a sender like I built but they cap the HP to something like 500 and theirs is regulated at the sender. That means there is no return line and if you have a regulator issue the tank needs to come down.

Huge challenge in getting the bulkhead style connector on the sending unit with a return line but I managed it. Also don't for get to send the return line down to the bottom of the tank.

I laid the pump on its side with the hydramat underneath it. Holley sells a hydramat with a 90 degree adapter; worked great. I used the hydramat plastic packaging bag to avoid cutting the hydramat on the sending unit hole edges.

Also be certain to use specifically submersible fuel line to connect the pump to the hardline on the sending unit.

My regulator is mounted to a plate I designed to fit over a block-off plate. I designed it to mount in the mechanical fuel pump location.

I also used one of my regulator brackets attached to the battery tray front to mount the Sniper Stealth relay and fuse holder. Using that location it fits nicely behind the headlight.

If anyone is interested I made extra brackets and plates to get the cost per piece manageable. I used 2 brackets on the Chevelle and they worked so well I will use 2 on my Impala as well.

Edit: One key point was I needed to turn the float around 180 degrees to get everything to go through the sender opening.

Scott

Attachment: RegulatornBracket-Blockoff_Example.JPG (121.56 KB) 40 View(s)


Regulator installed


Attachment: AeromotiveMountingBracketKit_23OC2020.JPG (114.12 KB) 38 View(s)


My bracket and block-off


Attachment: FuelSendingUnit71Chevelle.JPG (152.53 KB) 31 View(s)


Fuel sending unit customized for 71 Chevelle




Edited by toro455 on 12-24-21 10:24 AM. Reason for edit: No reason given.

 




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