my new project - Page 28

**4seasons69** · 08-13-2013

Aaaannndddd the never ending shitbox saga continues. More fuel pressure issues. We're kinda stumped. Thinking maybe it's in the tank. Idk if it's not a cheap/easy fix the car will probably sit until next year.

I might just completely redo the whole fuel system over the winter and go from there.

And a couple more crappy charts with dropping fuel pressure

**4seasons69** · 08-15-2013

So i putzed with the car a little bit last night. I ran the pumps one at a time and used the pressure regulator to raise the pressure to 110psi. One of the pumps sounded good and strong at 110psi the other got so quiet you could barely hear it.

So I'm going to run the return line into a gas can and the flow for each pump at 85-90psi.

If the one pump comes up bad I still have those ford gt pumps so for testing purposes I'll see what those flow if it's close to the 255 I'll put a video camera on the fuel pressure gauge and do a couple high way pulls and see what happens

**goodhart** · 08-15-2013

Would a wally 450 with a BAP be enough for this car?

**4seasons69** · 08-15-2013

Quote:

Originally Posted by goodhart

Would a wally 450 with a BAP be enough for this car?

Idk. I've talked to Shane about it but he wasn't sure. This is a thought I've had too.

**Tachyon** · 08-15-2013

Quote:

Originally Posted by 4seasons69

Idk. I've talked to Shane about it but he wasn't sure. This is a thought I've had too.

I would think it would be close to the limit of the pump (450, E85 edition).

Big turbo stuff...

**4seasons69** · 08-15-2013

Quote:

Originally Posted by Tachyon

I would think it would be close to the limit of the pump (450, E85 edition).

Big turbo stuff...

Kind of what I was thinking too. Just wondering does anyone remember if Murlo was running a bap on his 450?

**4seasons69** · 08-15-2013

Plus if I keep the big turbo I would like to eventually switch to e98. So if I change anything I would just like to do it once and be done with it

**Tachyon** · 08-15-2013

Quote:

Originally Posted by 4seasons69

Kind of what I was thinking too. Just wondering does anyone remember if Murlo was running a bap on his 450?

I want to say it was around 750 on a Disco Jet using E85.

**goodhart** · 08-15-2013

What do Vassil and Leasure use? Are they on big externals?

**4seasons69** · 08-15-2013

Quote:

Originally Posted by Tachyon

I want to say it was around 750 on a Disco Jet using E85.

With a bap?

Quote:

Originally Posted by goodhart

What do Vassil and Leasure use? Are they on big externals?

Not sure on vassil. Leasure is running an external. He was running fuelabs 1800HP model but switched to a weldon for this season. I think john is running an aeromotive eliminator in his galant.

The thing that's nice about the fuelab is it can be mounted intank

turbotalon1g · 08-15-2013

mechanical and be done with it.

**4seasons69** · 08-15-2013

Not exactly street friendly lol

turbotalon1g · 08-15-2013

**4seasons69** · 08-15-2013

At least the little bit of research I've done on them a mechanical pump doesn't seem like a good option at this point.

**Murlo26** · 08-15-2013

My 450 was not using a boost a pump. I had 2150s, fuel rail, afpr, Wally 450 hardwired, 6AN feed line, modified in tank return stuff. I was around 750whp, probably mid 600s on Shane's dyno. I still had a bit of room because I was only running 32psi. On a boost a pump I'm sure 850whp with proper fuel supporting mods could be done.

**4seasons69** · 08-15-2013

Quote:

Originally Posted by Murlo26

My 450 was not boost a pump. I had 2150s, fuel rail, afpr, Wally 450 hardwired, 6AN feed line, modified in tank return stuff. I was around 750whp, probably mid 600s on Shane's dyno. I still had a bit of room because I was only running 32psi. On a boost a pump I'm sure 850whp with proper fuel supporting mods could be done.

That's pretty good! I'm sitting 586 on Shane's dyno or about 680 on a dynojet right now with fuel issues. I'd really like to see 700 at db. A 450 and bap would probably get me there on e85 but doubt it would be enough for e98 which I would like to switch to maybe next year.

**4seasons69** · 08-19-2013

So me and tom spent a bunch of time Saturday flow testing my fuel pumps. We did all tears at 90psi. One of my 255s was 48gal/hr or 181liters/hr. The other was 40 gal/ hour or 151liters/hr. We also tested one of those ford gt pumps which came in at a dismal 33gal/hr lol. Tom also happened to have wally 450 so we put that in we came up with 51gal/hr on that.

Both 255s running they flowed 95 gal/hr. And with the 450 and the better 255 I don't remember exactlybut it was like 105 gal/hr.

So to verify that the one weaker pump wasn't an issue we left the 450 in and did a pull on the hhighway. We took a video of the gauge with a GoPro (haven't seen it yet). But brad rode with and kept an eye on the gauge. The fuel pressure still only went up to 60psi the just stayed there. So the pump wasn't an issue.

At this point I might try and get my hands on a known good regulator and do a pull just for the hell of it. But right now I think I'm just going to do a complete overhaul of the fuel system to make sure everything is up to part with how I want it.

**goodhart** · 08-19-2013

Good to know it's not the pumps I guess, but the hunt continues. Do you think it may be the regulator at this point? How bout the return line?

**Murlo26** · 08-19-2013

Could it maybe be a fuel pickup issue too? Clogged filter somewhere?

Also, the numbers you showed on the wally450 seem WAY low, I wouldn't be so sure that the 450 you used was working right.

**4seasons69** · 08-19-2013

Quote:

Originally Posted by goodhart

Good to know it's not the pumps I guess, but the hunt continues. Do you think it may be the regulator at this point? How bout the return line?

Possibly could be the regulator. Generally if the return line was clogged or not large enough it would cause a high pressure issue not low pressure.

Quote:

Originally Posted by Murlo26

Could it maybe be a fuel pickup issue too? Clogged filter somewhere?

Also, the numbers you showed on the wally450 seem WAY low, I wouldn't be so sure that the 450 you used was working right.

The strainers were replaced this spring and don't look clogged. Also the flow tests were done with the fuel filter removed from the housing so the filter isn't the issue.

The 450 was brand new right out of the box so it was working properly. There is obviously something wrong with my fuel system a restriction or bad regulator, or something.

There are also a few 90 degree an fittings in the system I wonder if those could be causing an issue