Advice - In Line fuel pump swap from in tank

[Schmieder]

What would it require to effectively swap an in-tank pump for an in-line pump outside of the fuel tank?

Is it as simple as running a sealed fuel line with filter where the old pump use to be and generally hooking up the inline unit?

Or is there more to this?

Can an inline fuel pump be installed after the intank pump and use both pumps. Just wiring both pumps from the same wires.

I think, key word there, that it would make both fuel pumps less stress to operate. Or would the inline pump, which will be stronger, cause problems for the intank pump?

Can I unplug the intank fuel pump and leave it there while running an inline pump? Or will the dissabled intank pump not flow at all when shut down?

Thing is, I need to up grade my fuel pump to something stronger. I had the Walbro 255 in mind but can't find one that is designed for the 1996 Grand Prix SE. There are ones for the 1997+. WIll those work just the same or is there design differences in the pump, housing, ect?

I tried searching these answers to no avail.

You guys have been a tremendous help. I couldn't do this turbo project with out this site and the wisdom there-in.

2010!!!

[AleroB888]

.....Or is there more to this?

Can an inline fuel pump be installed after the intank pump and use both pumps. Just wiring both pumps from the same wires.

I think, key word there, that it would make both fuel pumps less stress to operate. Or would the inline pump, which will be stronger, cause problems for the intank pump?

Can I unplug the intank fuel pump and leave it there while running an inline pump? Or will the dissabled intank pump not flow at all when shut down?

..........

I tried that, with an OEM type in-tank pump and a Walbro in-line outside the tank, both powered, separate power lines. It ran worse than the stock OEM did alone, and the OEM soon failed. I think that was because the venturi pump in the OEM canister could not function correctly with the Walbro pulling fuel downstream from it.

The Walbro could still pull fuel and sustain idle with the power cut off to the OEM, but overall flow was greatly reduced.

If you use a Walbro, use the original 12 V feed near the tank where the OEM pump was receiving power to switch on a separate relay for the Walbro, and use a check valve in the Walbro's fuel line to the fuel rails.

[Schmieder]

I tried that, with an OEM type in-tank pump and a Walbro in-line outside the tank, both powered, separate power lines. It ran worse than the stock OEM did alone, and the OEM soon failed. I think that was because the venturi pump in the OEM canister could not function correctly with the Walbro pulling fuel downstream from it.

The Walbro could still pull fuel and sustain idle with the power cut off to the OEM, but overall flow was greatly reduced.

If you use a Walbro, use the original 12 V feed near the tank where the OEM pump was receiving power to switch on a separate relay for the Walbro, and use a check valve in the Walbro's fuel line to the fuel rails.

Interesting, thanks.

Just a few moments ago I read about an in-line fuel pump, T-Rex, that is designed to work after a tank pump. I think it only pushes greater PSI when the manifold receives boost pressure. SO the in-line pump only turns on when boost is achieved. Seems simple enough.

Was your in-line built for such an app. or did you just drop in a standard OEM style inline?

I'm looking at different directions of fuel management for my turbo project. As I am only boosting around 4-7 psi, I have several options that don't include tuning.

1 - FMU and AFPR. Adding larger injectors using the AFPR to base good idle flow and the FMU to provide increase fuel psi under boost/load.
2 - New injectors w/ AFPR and an inline triggered from boost.

Can anyone recommend a simple, cost effective yet reliable fuel management that doesn't require ecu/pcm tuning. I have the rotten 96 that needs DHP but can't find a tuner for sale.

I think an AFPR in combo with a 6:1 FMU plus 28# injectors from 17-19# stock. Adjust idle fuel pressure to manually tune the larger injectors and use the FMU for boost pressures needed to increase fuel flow.

Will this be an effective set up for 4-7 psi turbo boost?