Jump to content
SAU Community

The Fuel Pump Thread

The Mafia

By The Mafia,
in Engines & Forced Induction

 Share

Recommended Posts

GTRNUR Grand Master

GTRNUR

Posted
Posted

Simple... A small electric syphon pump. I considered going that way too until I realised a syphon works fine on a Y fitting inside the tank if your return has a high flow rate.

Any serious track car is probably running an under car surge tank too, keeps the fumes, fuel and danger out of the boot.

  • Replies 299
  • Created
  • Last Reply

Top Posters In This Topic

Popular Days

Top Posters In This Topic

Popular Days

Popular Posts

XKLABA
XKLABA

The one in Tims link looks good Do not get a Weldon ,lol my Weldon is an awesome piece of gear, great flow for low amps and will pretty much pump anything but should come with ear plugs And ear muff

scotty nm35
scotty nm35

Yeh Peter, I have the 1500hp pump here I am still planning to fit to the Stagea. I saw their PWM output regs, they should work well together. Much better idea than running the PWM output from the Ha

GTRPSI
GTRPSI

Just found this interesting clip on the Fuelab 42402 pumps with the 52902 electronic regulators, nice to see a integrated package now, just set the base fuel pressure and walk away, no fiddling with f

Posted Images

Borci88 Veteran

Borci88

Posted
Posted

Simple... A small electric syphon pump. I considered going that way too until I realised a syphon works fine on a Y fitting inside the tank if your return has a high flow rate.

Any serious track car is probably running an under car surge tank too, keeps the fumes, fuel and danger out of the boot.

While that's probably an easy option, the cars in question I'm talking about (4 I know of), all run the same setup and don't have a jet/syphon pump. They run twin in tank pumps with a custom top hat that has two fuel lines running all the way to the fuel rail. All have been tracked and all have gotten low tanks and zero issues with surging / running out of fuel. Does this Jet Pump really work as well as we think it does?

33GTRV Mentor

33GTRV

Posted
Posted

I have an under car surge, 2 044s at near on full snot and it returns from the surge through the factory return. This set up at 13.8v should support over 1000hp on race gas qnd come bloody close on corn juice. It is fed from the stock location pump. It works because 1000's of people before us have developed systems and they're trial and error is well documented. Don't need to reinvent the wheel.

GTRNUR Grand Master

GTRNUR

Posted
Posted

Does this Jet Pump really work as well as we think it does?

With an entirely in tank setup, if you try and push too much fuel through the syphon jet it will not work properly or at all.

Not to mention your fuel pressure goes out of control due to back pressure in the return line.

I'm using a pump jet on one side of a Y fitting inside the tank.

How well does it work? Well with the tank on empty and running both pumps, it was back to 1/4 after about 1-2 minutes of pump operation.

Piggaz Grand Master

Piggaz

Posted
Posted

I have an under car surge, 2 044s at near on full snot and it returns from the surge through the factory return. This set up at 13.8v should support over 1000hp on race gas qnd come bloody close on corn juice. It is fed from the stock location pump. It works because 1000's of people before us have developed systems and they're trial and error is well documented. Don't need to reinvent the wheel.

One problem, the 044's don't last on E85.

  • Like 1
Piggaz Grand Master

Piggaz

Posted
Posted

Been through 6 in total.

First failure was the primary pump got lazy. The secondary covered it when it come online. Picked it up by a fuel pressure gauge and AFR gauge.

Replaced both...

Second set,same thing.

Third set, can't really remember... But enough to crack it and throw it all in the bin.

044's DO NOT last under E85 conditions. If you don't have gauges and running them, you're asking for trouble.

  • 2 weeks later...
dr phil Collaborator

dr phil

Posted
Posted

Had a bad issue with high fuel pressure in my gt four with a Walbro e85 pump. My factory fuel return hose had a restrictor in it (scottynm35 has seen one in a S15 before). This was an R34 RB25DE model, I now have a Stagea DET engine in it.

  • Like 1
  • 2 weeks later...
NISR32.5 Rising Star

NISR32.5

Posted
Posted

So did anyone end up using the Holley dominators?

What's the general consensus on a fuel system e85 compatible that will handle 450-500kw in a 32 Gtr. I wanna do it once and do it properly.

I've been advised to go a Holley dominator from the tuner, he said we can stage the pumps and run a sensor from the ecu to keep an eye on fuel flow. They have installed a few and he seems to like them but there is no long term usage at this stage.

The car currently has a nismo intank. Will be looking for a new pump to match with the new 1550 xpurts I will be getting.

The Mafia Grand Master

The Mafia

Posted
  • Author
Posted

So did anyone end up using the Holley dominators?

What's the general consensus on a fuel system e85 compatible that will handle 450-500kw in a 32 Gtr. I wanna do it once and do it properly.

I've been advised to go a Holley dominator from the tuner, he said we can stage the pumps and run a sensor from the ecu to keep an eye on fuel flow. They have installed a few and he seems to like them but there is no long term usage at this stage.

The car currently has a nismo intank. Will be looking for a new pump to match with the new 1550 xpurts I will be getting.

Stay away from the Holley dominator - They have had a high failure rate.

  • 2 months later...
Marko R1 Grand Master

Marko R1

Posted
Posted

Hi Guys,

I finally replaced my OEM in tank lift pump with a walbro 460ltr in tank. Quiet as a mouse :)

Had it on the dyno and we couldn't tune it with more than 15psi...as the boost increases and demands more fuel pressure - the fuel pressure was dropping off.

I am still running the OEM wiring harness with the added relay, however, as the pump draws up to 20amps, I was told that I need to run a thicker gauge wire direct from the battery to achieve 14v at full load.

My question is this (btw, it's an r32 gtr)...can I run the thicker gauge wire to the top of the 'top hat' on the fuel tank (i.e. direct to the Anderson plug) OR do I also need to replace the wiring between the fuel pump itself and the underside of the top hat? From memory, the underside of the top hat also runs an Anderson plug. Has anyone else running a walbro experienced similar voltage issues to myself? From memory, SIR RB runs a walbro in tank as well.

I'll also replace the fuel filter in the engine bay for piece of mind as this may be a catayst to drop in fuel pressure.

WantGTR Mentor

WantGTR

Posted
Posted

Have a 32 gtr and just replaced a walbro 255lph pump with a walbro 460. I also rewired the pump with 8 gauge wiring.

Previous pump on stock wiring was getting 8.8v on idle. New pump and rewire and now getting 13.3v at idle.

 

Walbro site has a table on voltages and lph rates. Interesting to look at. 

 

The pump shouldnt be dropping pressure. You either have a leak or a faulty fuel reg

 

  • Like 1
Marko R1 Grand Master

Marko R1

Posted
Posted

Thanks for the feedback. Did you run 8 gauge to the top hat only (on top of the fuel tank) or did u go direct to the fuel pump? 

If I'm not getting the voltage I need, the fuel pressure will not be up for the task and this is what I am experiencing. My tuner is certain that this is the issue. My fuel reg was fine with my previous setup (i.e. OEM lift pump with external 044 which ran power direct from batt) so I don't think it's the fuel reg.

 

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • Komdotkom
      R32 Gtst - Track Car

      By Komdotkom · Posted

      Good luck on the weekend mate
    • Duncan
      From Japan and back to Europe, my sh*tbox R34 GTT

      By Duncan · Posted

      Must have been an absolute nightmare to drive when the power steer was out, the rack ratio/wheel size/caster is all set up for power assistance
    • Duncan
      New

      By Duncan · Posted

      Welcome to SAU, what are you looking at buying?
    • GabsReDeal
      R32 GTS (RB20DE) Injectors Replacement

      By GabsReDeal · Posted

      I checked the injectors again (1 and 2, since they’re easiest to access) to make sure they weren’t clogged. Even though the entire fuel system had been cleaned, I wanted to be certain. Everything looked clean, so I reinstalled and connected everything. When I started the car to confirm everything was okay, it immediately revved up high, so I shut it off straight away. I checked to see if I’d missed a vacuum hose or something, but everything was connected. On the second attempt, the car ran without the high idle, but I noticed a distinct “compressed air” sound coming from the engine bay. Tracing the sound, I pushed injector #6 forward slightly and the noise stopped — it turned out it wasn’t seated properly, despite the fuel rail being bolted down. While holding it in place, the car idled steadily without stalling and ran for over 5 minutes. At this point, I pulled all six injectors out just in case I hadn’t seated them correctly or dirt had gotten onto the O-rings. Unfortunately, I discovered that I had damaged 3 out of 6 injectors (the OEM 270cc ones) during installation. So yes, this was my fault. Since only the pintle caps were damaged, I’ve ordered a Fuel Injector Service Kit from NZEFI to refurbish them. In the meantime, I reinstalled my new injectors – the car now idles fine for over 15 minutes without stalling. I have not attempted to drive it so far. It’s not perfect yet, as it hesitates when the throttle is pressed, but it’s a big improvement. Unplugging the IACV with the new injectors idles at around 800rpm, even with the IACV screw tightened fully. But this is probably due to tune.
    • hoodedreeper
      Chris' Toyota Mark ii JZX110

      By hoodedreeper · Posted

      I wanted to try and preserve the front bumper as long as possible, they're not cheap and are made to order in Japan. Taking inspiration from my previous K11 Micra build where I made an undertray for the Impul bumper, I did the same for this BN Sports bumper but a little slimmed down.  This time round I only made a 'skid plate' (if that's the correct wording/term) for just the bumper surface area, the Micra version covered the gap like an undertray. Starting off with a sheet of mild steel approx. 0.9mm thick 4ft x 2ft in size. I traced around the bumper, cut it out and cleaned the edges. Luckily I was able to get two halves from one piece of metal In the video I installed it as is, but I've since then I've removed it to spray and add a rubber edging trim. The rubber trim is suitable for 1-2mm and it's a really nice tight fit. The bolts had to be loosened due to the plates being too tight against the bumper, the trim wouldn't push on I used some stainless M6 flat headed bolts for a flusher finish (rather than hex heads poking down), I believe this style fastener is used for furniture too incase you struggle to source some. The corner's are a little wider, but this may be an advantage incase I get close to bumping it  The front grill got some attention, finally getting round to repairing it. Upon removal one fixing pulled itself out of the plastic frame, one side is M8 that fixes inside of the frame, where as the other side is M5. Not knowing I could get replacements, I cut down an M8 bolt, threaded it inside the frame along with a decent amount of JB Weld.  The mesh was replaced to match the bumper. One hole on the bonnet/hood had to be drilled out to 8mm to accommodate the new stud, once the glue had set it could be refitted. I think the reason the grill was double meshed was to hide the horn/bonnet latch (which makes sense) but I much prefer it matching the bumper Bumper refitted and it's looking much better IMO The Youtube video can be seen here: https://www.youtube.com/watch?v=bVZP35io9MA
×
×
  • Create New...