weber 40's and fuel pumps

[TimNC]

Blunt....fwiw, If your car's head is drilled and tapped for the machanical fuel pump, the the mechanical pump is always a reliable option (per Mike Self's sage advice above). But if, like me, your engine head is not drilled and tapped for a mechanical fuel pump (from fuel injected model), then the Carter (and other brands) electric fuel pumps are a cheap and easy option But I would recommend to you, and to anyone who is using an electric pump, to check the pressure at carbs with an accurate fuel pressure guage. Yes, the Carter (and other brands) low pressure pumps are supposed to deliver no more than the rated amount of fuel pressure...however, it has now been my experience on a couple of different occassions that the actual fuel pressure at the carbs can vary widely from pump to pump (same model). Again, I recommend to anyone with an electric fuel, check the pressure at the carbs, just to be sure. You might be surprised, like I was. My 02 cents worth....

[dapbmw]

Hey Blunt,

Electric fuel pumps are ok especially if you live in a colder climate as you don't need to prime the pump or the carbs anymore, while a mechanical pump will be fine but is a pita in the winter time. FYI Weber DCOE's like running at 2.5-4.0 psi, in your case maybe around 3-4 psi.

It depends on how you use your car. if it is mainly for street use i recommend:

1. Facet interrupter solid state pump model # 40105 or 40106 (4-5 psi/12gph may or may not need a regulator) . This very reliable and works best with side drafts, delivers a steady 2.5 psi/12gph, no regulator required. wiring is simple just get a positive source from the ignition coil's + terminal, so the pump only works when the coil is on.

Mounting should be next to the tank, this is very small and draws only .75 amperes of current. cost around $25-35 depending on who is selling it, you can find it in ebay and your local auto parts store. you can get it in this site for $28 + shipping

http://www.aircraftspruce.com/menus/ep/fuelpumps.html

contrary to what some websites say about this pump being lousy, i used and installed it on a few conversions over the years, i even used it on my 1502 with modified engine with the 304, 10:1, big valves and dual 45's, and it ran flawlessly. even aircraft parts suppliers recommend these.

2. if you want more fuel volume which is what your 2.3 needs then use the Facet #476087 Silver Top interrupter type pump 4-5psi 18gph. this pump is so versatile as you can mount it near the tank or at the engine bay, can be used for street and track. a dual purpose pump. you may not need a regulator.

Cheers,

Dave

[Lee]

When left in the hot sun for an extended period of time, or even after a very hot track session, it is possible that a lot of fuel evaporation occures, leaving the bowls half empty or eeven close to dry.

With a mechanical pump, one must crank the engine before it fills the bowls, while with an electric pump, just flick the switch (that controls the fuel pump) a few seconds before starting the engine, and here you go. You can even hide the switch, which makes a great anti-theft system. No fuel. No go.

[tjones02]

I've used M30 fuel pumps on 02's for many many years. I've also seen them used on triple Weber 3.0 liter M30's.

part # 13 31 1 260 677

Use the # 13 31 1 250 398 same, late '02 and carbed' M30

Mine was a used when installed in '88 and is still *Quietly* running today! I can document over 170K miles on it. I'm going to use it when I install my 45's on the 2.3 I'm currently collecting parts for.

See my previous post... in this thread .....

http://www.bmw2002faq.com/component/option,com_forum/Itemid,57/page,viewtopic/start,0/t,288923/topic_view,flat//

[boxy02]

Does anyone know the rated PSI delivered from the stock 2002 mechanical fuel pump?

What's the rated PSI from the M30 mech. fuel pump?

Thanks,

[mikekoch]

We put a fuel pressure gauge inline with my mechanical pump the other day and got a peak of 4psi.

[Pouya]

On 8/3/2007 at 7:03 AM, Lee said:

Hi Blunt.

You will need an electric fuel pump, and pressure regulator set to about 2,5psi. Carter makes external pumps. They work okay and cost in the vicinity of $75. If you run a daily driver and don't want the constant buzz, then you can use an e21 pre-pump assembly and an external regulator. No noise, all hidden in the tank. Easy to plumb. That will allow you the full use of the trunk.

Carter pump.

I know I am reviving an old thread but I wanted to know if anyone has done what Lee is suggesting here. e21 pump in the tank sounds like a great idea!

Edited August 29, 2018 by Pouya

[TobyB]

E21's don't have an in- tank pump that I remember-

 

early E30s do.  However, sit down before you price one.

They are also not super durable, and I haven't seen an inexpensive reliable 3rd party replacement.

 

That said, it's a very elegant solution, if you can get it to work.

 

t

 

[Pouya]

42 minutes ago, TobyB said:

E21's don't have an in- tank pump that I remember-

 

early E30s do.  However, sit down before you price one.

They are also not super durable, and I haven't seen an inexpensive reliable 3rd party replacement.

 

That said, it's a very elegant solution, if you can get it to work.

 

t

 

i guess i am better off with a $50 small facet pump mounted in the trunk or under the rear seat. https://www.amazon.com/Facet-FEP42SV-Electric-Clamps-Fittings/dp/B0716LFMJ5/ref=pd_cp_263_1?pf_rd_m=ATVPDKIKX0DER&pf_rd_p=fcaa6d12-8b2b-4ad7-b277-864b2da79f6e&pf_rd_r=DP6D205KF2JVESPY6MS0&pd_rd_wg=uszuB&pf_rd_s=desktop-dp-sims&pf_rd_t=40701&pd_rd_w=s8fpP&pf_rd_i=desktop-dp-sims&pd_rd_r=5bb02505-abb9-11e8-b11d-915b29cfa4b3&pd_rd_i=B0716LFMJ5&psc=1&refRID=DP6D205KF2JVESPY6MS0

[Lee]

1 hour ago, TobyB said:

E21's don't have an in- tank pump that I remember-

 

early E30s do.  However, sit down before you price one.

They are also not super durable, and I haven't seen an inexpensive reliable 3rd party replacement.

 

That said, it's a very elegant solution, if you can get it to work.

 

t

 

Here.

 

"suction device with pump"

 

https://www.realoem.com/bmw/enUS/showparts?id=1733-USA-07-1982-E21-BMW-320i&diagId=16_0007

 

 

[Simeon]

What’s wrong with your mechanical pump?

[tisalover]

Hi Steve, don't forget, to paraphrase Voltair , "The enemy of good is better."

If your car is prepared, i.e. the cylinder head has a mechanical fuel pump capability, I agree with Tom Jones. It is one less complicated system to worry about. I ran the TISA with twin 45 Webers And a  mechanical fuel pump for almost 30 years with no problems at all. I upgraded to a electric pump when I change motors and had an E 12 cylinder head put on it, crackheads had stolen the original cylinder head and sold it for scrap.

The only downside is if the car sits for long time it can be difficult to prime the  Carburetors. I purchased several one-way valves from you for my fuel system as the 2002 TI has leaky carbs.

This is sort of a old school versus new school question. I also like the absence of noise utilizing the original fuel pump. A plain old facet Block electric fuel pump in the trunk of the car with the pressure regulator works fine, but it is noisy even with rubber insulation. A rotary fuel pump would be preferable if you go electric. Which car is it going in? Let us know how it turns out, pictures are always good.

Best regards, Peter

[Pouya]

8 hours ago, Simeon said:

What’s wrong with your mechanical pump?

i actually have the e9 fuel pump but wanted to clean up engine bay.

[Pouya]

9 hours ago, Lee said:

Here.

 

"suction device with pump"

 

https://www.realoem.com/bmw/enUS/showparts?id=1733-USA-07-1982-E21-BMW-320i&diagId=16_0007

 

 

thanks Lee! I will have to stick with my el cheapo Facet pump for now. We will see how noisy it is!

[M3M3]

18 hours ago, TobyB said:

early E30s do.  However, sit down before you price one.

They are also not super durable, and I haven't seen an inexpensive reliable 3rd party replacement.

 

t

 

you got that right....for a simple low pressure/high volume pump they are stupid expensive.

 

and the cheap alternative, the AIRTEX, is total crap.  the new one i tried lasted about two hours of running time.

 

-----------

folks talk about how "noisy" the simple electric pumps for carbs are, but i have yet to hear a properly installed one that was too loud.  you can hear them when you turn the key, but once the car is started 2002's make so many other noises that the fuel pump is irrelevant.  especially true if you have a "proper" exhaust on the car.  you will certainly not hear the fuel pump above the sound of the dual carb intake noise.  the "too loud" argument is overplayed....