S4 Fuel Pump into S3 Tank???

[deecee]

Anyone know how difficult it is to get an In Tank S4 Fuel Pump into the Tank of an S3???

Regards,
Daryl

[Dr.Hess]

I don't know what the top of an S3 tank looks like, but the top of an Stevens tank has a big round GM style locking ring that holds the pump, tubes, etc. If you don't have that, it isn't going to be easy.

Dr.Hess

[deecee]

Thanks for the Info...I think the S3 only has a Fitting, which would require Major Surgery to the Tank...

Let file this idea under "Ain't Gonna Happen".

[zhastaph]

Dr.Hess said:

I don't know what the top of an S3 tank looks like, but the top of an Stevens tank has a big round GM style locking ring that holds the pump, tubes, etc. If you don't have that, it isn't going to be easy.

That locking ring is a complete arse, without a doubt the worstest job i have done on her is taking the fuel pump out. At one point I was honestly thinking I wasn't gonna get it back in

[Squelch]

Why would anyone what to ?

The external fuel pump setup is great for putting a high flow/high pressure pump right where the original was.
Or, if it's a Bosch fuel injected car with the dual pumps, the stock pumps work fine with electronc fuel injection.

[deecee]

It was a Bosch Injected 86 that has a transplanted S4s motor with Delco Injection.

I have yet to find any information on the stock Flow Rate and Pressure, so I'm preparing for the idea that the pump thats in it now won't work.

[Squelch]

Having done the conversion of Bosch injected car to the Delco electronic system, the stock dual pump setup is more than adequete fuel flow. You MUST use an external regulator on the fuel rail as the Delco rail mounted regulator has too small of a bypass and will cause the fuel pressure to be too high at low manifold pressure.

The Areomotive regulators work well.

[deecee]

I take it that you're talking about a Regulator prior to the Fuel entering the Rail with its own Return Line?

What do you recommend for the Fuel Pressure to be set at?

[Squelch]

No.. The fuel pumps feed the rail directly.. the regulator is after the rail.
Fule pressure should be around 42-45 psi at the rail with the engnie running, but the reference hose disconnected (open)

[deecee]

So the Delco Regulator is replaced...gotcha.

[Squelch]

Exactly.. the Delco regulator can not "bypass" enough fuel at low engine speeds. The result is that the engine runs rich. This is because the dual pump setup flows more voulme and pressure than the later in-tank setup.

Take the existing fuel rail, and put AN fittings on either end, then use some braided hose to make up the fuel lines. Neat, clean, and half the cost of the factory plastic lines. The Aeromotive 13109 works great, if it's not available use the 13101 with adaptors to drop it down to AN6

[deecee]

Thanks for the info, it was really appreciated...

I had Custom Made Braided Stainless Steel Hoses, and the Twin Stock Pumps were switched for one that was High Volume & Low Pressure.

I had no idea that the Stock Regulator was causing a Restriction, but it goes a long way in explaining why the motor has afew quirks.

Any advice on Turbos???

I installed a T3/T4 Stage 3 Turbo that was built for racing by the Garrett Factory and the Bottom End Power just isn't there.

I would like to go with a Ball Bearing Version this time, with emphasis more towards Bottom End Performance along the lines of a Super 60.

Any Advice?

[Squelch]

High flow, low pressure isn't going to work on a fuel injected car. The Delco regulator has nothing to do with it.
Put the stock pumps back in place.

As for turbo advice, well, I'm a bit biased..
I would get the turbo from WC Engineering

Then again.. I own WC Engineering...

[deecee]

I think were on the same page...what I mean is Higher Volume and Lower Pressure than the Stock Pumps.

As for the Turbo...I don't have a Core.

[Squelch]

I think you need to define "low pressure" All EFI systems use a high pressure pump.

Contact me off list for other turbo options. We can make almost anything.