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Mechanical vs. Electric Fuel Pump


Frengel

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I just bought a '71 02 (my first, I'm a former Porsche guy) and while checking out the systems I found some unexpected wiring. It turned out to to be for an electric in-line fuel pump installed on top the engine between the fuel filter and carburetor. After a few minutes of research I found that the car originally had a mechanical fuel pump. Is an electric pump a recommended upgrade, and if so where should it be located and how should it be wired? I want the car to be as original as possible, but am will to give up some originality for improved function and reliability.

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the mechanical pump is original, reliable, QUIET,

no extra bogus wiring and mountings, no added connections,

ample output for single, or duel carbs.

'86 R65 650cc #6128390 22,000m
'64 R27 250cc #383851 18,000m
'11 FORD Transit #T058971 28,000m "Truckette"
'13 500 ABARTH #DT600282 6,666m "TAZIO"

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Many get it in their heads that an electric fuel pump is an "upgrade" but to the contrary it is a hassle and a safety hazard if not wired with a safety relay of some sort!

See this FAQ post for details on the various mechanical fuel pumps...

http://www.bmw2002faq.com/component/option,com_forum/Itemid,57/page,viewtopic/t,294242

And another thread here...

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

HTH :)

Tom Jones

BMW mechanic for over 25 years, BMWCCA since 1984
66 BMW16oo stored, 67 1600-2 lifelong project, 2 more 67-8 1600s, 86 528e 5sp 585k, 91 318i
Mom&Dad's, 65 1800TiSA, 70 2800, 72 2002Tii 2760007 orig owners, 15 Z4 N20

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Please elaborate on the need for a safety relay for the electric fuel pump. Specifically what type of relay?

320i's, early VW Rabbit/Scirocco and use RPM activated fuel pump relays. The VW ones have built in fuse holders... Volkswagen Part# 321 906 059 C

http://www.autohausaz.com/search/product.aspx?sid=2lwc032nvfggpq45kxutme45&makeid=800026@VW&modelid=1284915@RABBIT%20&year=1977&cid=relay@relay&gid=3380@Fuel%20Pump%20Relay

Here's a wiring diagram for the VW relay...

http://www.ratwell.com/mirror/sfraser/relay.html

Racing parts suppliers offer inertia shut off relays. Mid 80's Fords also used similar inertia relays. A web search will turn up info on wiring and model/years.

http://www.pegasusautoracing.com/productdetails.asp?RecID=87

As for which electric fuel pump to use.... If I have to install an electric fuel pump on a carbureted '02 I like to use the Pierburg one...

http://www.bmw2002faq.com/component/option,com_forum/Itemid,57/page,search/mode,results/?search_keywords=pierburg&search_terms=all&search_author=tjones02&search_forum=-1&search_time=0&search_fields=all&search_cat=-1&sort_by=0&sort_dir=DESC&show_results=topics&return_chars=200

HTH,

Tom

Tom Jones

BMW mechanic for over 25 years, BMWCCA since 1984
66 BMW16oo stored, 67 1600-2 lifelong project, 2 more 67-8 1600s, 86 528e 5sp 585k, 91 318i
Mom&Dad's, 65 1800TiSA, 70 2800, 72 2002Tii 2760007 orig owners, 15 Z4 N20

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the need is because in an accident, you want the fuel pump to shut off if the car is not running. a mech pump stops when the engine stops. elec pump won't stop unless the (incapacitated?) driver turns it off or a safety switch does it for them.

2xM3

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In the event of a fire an electric fuel pump will fuel the flames unless turned off by one of these mentioned relays......

Pun intended!

Tom

Tom Jones

BMW mechanic for over 25 years, BMWCCA since 1984
66 BMW16oo stored, 67 1600-2 lifelong project, 2 more 67-8 1600s, 86 528e 5sp 585k, 91 318i
Mom&Dad's, 65 1800TiSA, 70 2800, 72 2002Tii 2760007 orig owners, 15 Z4 N20

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