krisner89

Just installed this pump. Thinking its going to keep up with 500-600 hp. Read several threads were this pumps 120 gph. Only $20 so I got one off ebay that said 120 gph/5.5-6.5 psi from summit racing. Today I looked on summits actual website and is only 40 gph. Called summit and they said its only 40 gph (slightly better than a stock pump). Did carter change this pump or has 120 gph been a misconception from the start?

five7kid

iTrader: (14)

120 gph is huge. Probably been a misprint all along.

I had one on my ZZ4 clone, never had fuel delivery issues with it.

krisner89

It's a misprint. Summit and Jegs both say 40 gph. Jegs gave me carters # and they say 40 gph also. Now I gotta find another pump to keep up with my needs.

Thinking eddy victor 1711 130 gph with a mr. gasket return style regulator and be done with it. Those any good? alternatives?

Got 400 hp (+-50 hp) on motor and 150 shot nitrous

Night rider327

iTrader: (13)

I really like to run a dedicated fuel system for nitrous above 75 HP.
2 gal. fuel cell mounted up front, Holley red or blue elec pump (depending on nitrous system) close to cell, fuel pressure reg., 3/8" or 1/2" fuel line to fuel solenoid

I run this mech fuel pump on my engine (500+ HP NA).. 172 gph http://www.speedwaymotors.com/Carter...-Pump,186.html

And planning a nitrous system for the future and with it I will be running like I said a dedicated fuel system for it... Even with the massive 172 gph pump.
I will run a 2 gal cell, Holley blue pump and reg., and will be running a NX 50-300 HP plate system

krisner89

I thought about a dedicated fuel system just for the nitrous using a electric pump. I wonder if I could tap into the mechanical pumps return line with a tee fitting for the electric pump. Instead of a fuel cell.

skinny z

Jegs and Summit say one thing (40 gph). A half a dozen sites say another (120 gph). Carter's site has no spec on it.
I picked one of these pumps up based on two things. The gph numbers, which were listed at 120 gph and the return line to the tank. Seems that dead -heading a mechanical pump is not necessarily the best thing to do if you want to avoid vapour issues.
I haven't installed this unit yet as I'm still working on the return line, however, if all goes well, I'll have back to back tests between this Carter and the Edelbrock 110 gph pump I'm currently using. The latter is providing nearly zero pressure at the top end of the strip and I hardly think that a mid 12 second car (at 3700 lbs) is going to consume that amount of fuel.
I'll post up with results in a couple of weeks (I hope).

krisner89

Have you got any results yet? Really curious how them two compare to eachother

skinny z

Unfortunately, no. I was caught out by the different clocking of the inlet and outlet lines so I'll need to get a handful of AN fittings to make it all fit. As it is, it looks like the line to the carb will be hard into the lower rad hose. I won't know for sure until I have the parts.
(I'm also out of town for a couple of weeks so it's all on hold).

skinny z

Installed and tested although not at the track.
Fuel pressure at idle and normal cruise is 7 psi.
Now the odd thing is what happens as the rpms rise as during a WOT blast.
Pressure drops to around 1-2 psi and will slowly recover. I have to limit the upper end of the test due to speed so I can't say if would rebound completely.
The problem I had with the earlier Edlelbrock was almost zero fuel pressure at the top end of the drag strip. I put that down to a vapour issue as it only happened at the track after an heat soak cycle or two. Now I can't say for certain what was going on.
The Carter didn't do what I had hoped. In fact, the Edelbrock never had a pressure drop on the street so in that regard the Carter is worse.

skinny z

Further to my last post.
I don't think the M6626 is up to the task of supplying enough fuel even for a modest build as my own.
Based on this simple formula and using a .5 brake specific fuel consumption (.5 lbs of fuel per hour per horsepower produced) as a general guide.

({your} flywheel hp x 0.5 BSFC / 6) = the GPH needed.

In my case, based on 400 CHP, then (400 x .5 BSFC/6) = 33.3 GPH.
The Carter has a 40 GPH rating based on zero PSI (free flow). Add 6-7 PSI to that and it can be seen that it would have a hard time delivering enough fuel. As witnessed by my failed experiment.