Fuel Pump Location

martin172 · Post by **martin172** » Sun May 22, 2011 10:25 am

MK2s have their fuel pumps in the boot and some converted MK1s too instead of being under the trap door.

What are the advantages of having it in the boot other than it being away from Mother Natures best efforts to bugger it up?

gtsmrt · Post by **gtsmrt** » Sun May 22, 2011 11:20 am

Hi Martin,

I guess you have one of the main reasons as you already stated. I'm not sure of the mechanics, but the larger capacity of the 289 may have been starving the engine of fuel and the relocated position allows for a better fuel delivery. It would also be a lot easier to service the pump in the boot.

Regards, Robin.

martin172 · Post by **martin172** » Sun May 22, 2011 3:00 pm

It is tempting to put it in the boot.
I wonder how much of a pain moving it would be though as I would need new pipes and brackets.

Has anyone got a piccy of a boot mounted pump and how it's held on and the pipes etc?

V8 burble · Post by **V8 burble** » Sun May 22, 2011 8:47 pm

If it ain't broke don't fix it! My advice is to leave well alone.
Despite the OEM pump's proximity to an exhaust silencer and road spray etc it still usually manages to function okay.
To give yourself peace of mind, always carry a spare pump.
You can also mount a DIY heat deflector or some specialist heat shielding on the same L-shaped bracket as the pump.
For the DIY deflector get 2 offcuts of thin aluminium plate and space them about 1/4 to 1/2 inch apart. This horizontal deflector is attached to the vertical of the OEM plate with another sturdy L bracket.

The standard Tiger has 5/16 inch fuel pipes. These often flow insufficient fuel for a modified/ higher capacity engine where 3/8 inch lines are normally used. A compact pump such as the Carter GP4070 uses 3/8 inch lines and will fit comfortably in the wheel well.
http://www.summitracing.com/parts/CRT-P4070/?rtype=10
You will notice that this pump uses mounting grommets on the L plate as standard. It is also a good idea to use Mini (old) exhaust bobbins or similar to mount the L plate to the body in order to minimise noise.

The outlet from the fuel tank would need modifying for a 3/8 inch fitting plus new hoses/pipes and body grommets with the option to run the hose internally if preferred.

A lot of work but well worth it, provided you don't create too many sparks or have the battery connected!

By the way, I have a brand new (bought in error) Carter GP4600HP, 100gph pump for sale. This uses 1/2 inch lines and may be more suitable for an Ultima or other Chevy engined machine (or bigger Ford). If you know of anybody, please let me know.

http://www.summitracing.com/parts/CRT-P4600HP/

michael-king · Post by **michael-king** » Mon May 23, 2011 12:20 am

Martin,

I think you will find the reason for the move was to get it away from the heat of the exhaust. The stock location places it in an area that means the pump gets warmed quite nicely by the right exhaust and allows heat to soak into it after stopping. The MKII location is probably a little easier to service if needed as a small bonus.

Engine size will have no effect on the location of the fuel pump, if the pump is upgarded to the appropriate size there is no issue (many 289, 302,347 tigers all run the pumps in the stock location)

To move the pump is not to hard, it does require re-jigging the lines but thats really a matter of drilling some holes in the vertical face of the spare tyre well.

I think many owners move the pump for the perceived safety of not having the pump above the exhaust in a small trap door behind them. Many owners keep the pump in the stock location and build heat sheilds over the exhaust below the pump to help prolong their life and assist the heat issue.

V8 burble · Post by **V8 burble** » Mon May 23, 2011 9:03 am

Engine size will have no effect on the location of the fuel pump, if the pump is upgraded to the appropriate size there is no issue (many 289, 302,347 Tigers all run the pumps in the stock location).

That is perfectly correct.
What I should have said was that if anybody is considering changing to 3/8 inch lines, there is the option to put the new pump in the wheel well at the same time.

gtsmrt · Post by **gtsmrt** » Mon May 23, 2011 9:08 am

martin172 wrote:It is tempting to put it in the boot.
I wonder how much of a pain moving it would be though as I would need new pipes and brackets.

Has anyone got a piccy of a boot mounted pump and how it's held on and the pipes etc?

Hi Martin,

As V8 Burble stated, if your not having an issue then don't worry about moving it. Moving the pump is more time consuming than tricky. Getting the pipe work to match the old line would be the hardest part so you can use the existing mounting points. I would just go for the heat shield, but I would be more worried about the heat soak with the big lump of iron in the engine bay.

Regards, Robin.

V8 burble · Post by **V8 burble** » Mon May 23, 2011 11:29 am

I have used Nimbus GII heat shields (available from Merlin Motorsport) which are very light and extremely efficient:

http://www.merlinmotorsport.co.uk/p756/ ... _info.html

Larger sizes direct from Nimbus Motorsport:

http://www.nimbusmotorsport.co.uk/ProdS ... tegory=252

gtsmrt · Post by **gtsmrt** » Mon May 23, 2011 11:32 am

V8 burble wrote:I have used Nimbus GII heat shields (available from Merlin Motorsport) which are very light and extremely efficient:

http://www.merlinmotorsport.co.uk/p756/ ... _info.html

Larger sizes direct from Nimbus Motorsport:

http://www.nimbusmotorsport.co.uk/ProdS ... tegory=252

That is really good stuff... I have some of that triple layer shielding myself (yet to be installed though).

michael-king · Post by **michael-king** » Mon May 23, 2011 2:44 pm

martin172 wrote:It is tempting to put it in the boot.
I wonder how much of a pain moving it would be though as I would need new pipes and brackets.

Has anyone got a piccy of a boot mounted pump and how it's held on and the pipes etc?

My car has a fuel cell so you couldn't mount the pump in the spare wheel well, if you mount it on the vertical face in the rear you need to use exhaust or isolation bobins to stop it from transfering vibration to the interior.

for pics see:

If you search the board for MKII boot there is a pic of the boot on a stock MKII, it has a small bracket that allows the pump to float in the spare wheel well kind of like a mini version of the bracket that holds the pump in a MKI/IA

martin172 · Post by **martin172** » Mon May 23, 2011 4:32 pm

Thanks for the info everyone.

I do have a luxury of choice here.
The last owner had this fitted...

..and was pop rivetted here.

It does seem to have kept the pump in reasonable condition.

I may for the time being put it back.
I think I will create some sort heat deflector to stop it becoming an oven in there.

bigbob · Post by **bigbob** » Mon May 23, 2011 5:26 pm

Strangley enough I to have moved my fuel pump to the boot for 2 reasons;
1] Safety & access
2] Gave me somewhere to put the servo.
I also took the opportunity to fit an in-line filter under the boot floor to filter the petrol before it reaches the pump. 1 under the bonnet just soaks up too much heat. I used the pump wiring to power a relay & ran main wires direct from the battery. May not be necessary with standard pump, but mines 18PSI 140GPH.

martin172 · Post by **martin172** » Tue May 24, 2011 12:18 am

The filter under the bonnet does do a good impression of a coffee percolator.

What evicted your brake servo Bob?

bigbob · Post by **bigbob** » Tue May 24, 2011 8:46 am

Had to relocate header tank to servo position to fit the supercharger. Tried servo in passenger footwell but restricted leg room. Made false battery box ,with insulation under, in pump position. Servo fits in neatly.

gtsmrt · Post by **gtsmrt** » Tue May 24, 2011 9:26 am

martin172 wrote:

Hi Martin,

Was that the actual tank or just a cradle for the tank to sit in? Do you have the original saddle tanks? Will you be looking at repairing the previous owners efforts at some stage? How did they have it all connected previously? I think that's enough questions for now.

Regards, Robin.