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> Fuel pump relocation front or rear? Type?
Joec
post Jul 22 2021, 11:40 AM
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Brand new to the 914 world. My car, a 74 2.0 was parked for 25 years, bought as a roller. Now missing the fuel pump( among other stuff) looks like it was plumbed for a 2 port pump anyway as 1 line to the injectors with a return line only at the end of the run, no y connector. I plan to replace all of the fuel lines so now is the time to place the pump. Seems real easy to place on firewall as lots of room there. I have read countless articles but not much recent stuff and most are vague with instructions assuming I have full comprehension of the car, which I don't. It sounds like stainless lines in the tunnel are a must, what fuel pump is suggested? Front or rear?,modify and put in tank?? Suggestions or point me to a current article. Any help really appreciated.
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ClayPerrine
post Jul 22 2021, 12:45 PM
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There is a known issue with vapor lock on 914s. The fuel pump was mounted next to the heat exchangers, and hot weather would vapor lock it. The factory fixed in 75 by moving the pump up front.

I normally buy an Airtex E-8445 pump, and mount it under the fuel tank. Lots of people update the fuel pump using the 75 pump and mounting location.

And yes, the stainless steel lines are an absolute must to do 50 year old plastic is risky and can cause fires.

Good luck.

Clay
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rjames
post Jul 22 2021, 01:20 PM
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(IMG:style_emoticons/default/agree.gif)
Move it to the front.
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NARP74
post Jul 22 2021, 01:34 PM
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I have heard you can get by without the relocation by using some modern heat shield tube around the hottest areas, like DEI or similar. Chris at Tangerine has some experience and sells kits for the lines etc. I have the kit, not installed yet.
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mlindner
post Jul 22 2021, 01:36 PM
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Joec, mine in a 914-6 GT Tribute for track but still streetable. For easy access I put the fuel pump in the front trunk. Best, MarkAttached Image
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advman89
post Jul 22 2021, 01:40 PM
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Just ran this gauntlet.

The 1971 I got--the lines were shot--in fact, I barely touched one of the old lines in the engine bay and it completely disintegrated. Another anecdote--was in Phoenix at a Porsche junkyard and it was full of stacks of burned up 914s. Oh, and the insurance on this 1971 came in higher than my 964...so yea...fires are a thing.

I bought the the lines from Tangerine Racing. They were hugely helpful. Also had the relocation instructions/bits from Dr 914 at AutoAtlanta. It was a bit of overkill, but gave me a little flexibility on the mounting at the front.

It took me longer than it should have because I didn't have a second set of hands to run the long lines through the tunnel..but with two people a bit of motivation, it's an afternoon if you have everything you need.

Couple pics...and while you have that cover off in the front--might as well check to see if you need to replace your master cylinder...
Attached Image Attached Image

someone told me early on...spend the money upfront...or spend the money on the backend to fix everything--but just understand, you'll be spending the money. (IMG:style_emoticons/default/sheeplove.gif)
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willieg
post Jul 22 2021, 05:01 PM
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I took some pages out of Tygaboy’s installation for my fuel pump installation. I bought a Tanks GPA2 fuel pump from Summit and drilled a large 3+“ hole in the top of the fuel tank, directly above the sump that is in the bottom of the fuel tank. The GPA2 fuel pump slid into the hole and the bottom of the fuel pump rests in the sump. Very tidy installation. Tygaboy being somewhat “touched” did another fuel pump installation which is also worthy of a think.



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KSCarrera
post Jul 24 2021, 03:19 AM
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914Sixer
post Jul 24 2021, 06:04 AM
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PLEASE do not use worm gear clamps on fuel lines. Use fuel line band clamps only


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mlindner
post Jul 25 2021, 04:36 AM
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Thanks 914Sixer, will change out. Mark
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930cabman
post Jul 25 2021, 06:50 AM
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Welcome aboard mate. I agree with the replacement of the original fuel lines and moving the pump to the front. How is the level of rust on your new 914?
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Joec
post Aug 7 2021, 02:41 PM
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Car is rust free, had maybe 1 paint job in its life. Small hit in rear quarter, previous hit in front end. Hoping to get it running soon to assess the engine's health.
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SKL1
post Aug 7 2021, 09:15 PM
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Use a rotary pump in the front with Chris' (Tangerine Racing) lines in the tunnel... job done!
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Joec
post Sep 21 2021, 04:12 PM
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All ready to order new stainless fuel lines for the tunnel and after talking to Auto Atlanta they suggest not replacing the lines in the tunnel as they are not prone to failure. Any thoughts? I had planned on replacing all of the fuel lines.
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brant
post Sep 21 2021, 04:17 PM
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agree with all of the above.
the front location solves the vapor lock issue

also.... these pumps really are pushers... not pullers...
so although the factory got away with motor bay installation... its because they kept the pump low and allowed gravity to do the pulling for the pump.

front mounted is the solution
and the reason the factory used that location starting in 1975
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Jamie
post Sep 21 2021, 05:09 PM
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QUOTE(brant @ Sep 21 2021, 02:17 PM) *

agree with all of the above.
the front location solves the vapor lock issue

also.... these pumps really are pushers... not pullers...
so although the factory got away with motor bay installation... its because they kept the pump low and allowed gravity to do the pulling for the pump.

front mounted is the solution
and the reason the factory used that location starting in 1975

And don't neglect to install fuel filters, I mounted before and after the new front mounted pump to catch any "stuff" from the old fuel tank.
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jcd914
post Sep 21 2021, 05:59 PM
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QUOTE(Joec @ Sep 21 2021, 03:12 PM) *

All ready to order new stainless fuel lines for the tunnel and after talking to Auto Atlanta they suggest not replacing the lines in the tunnel as they are not prone to failure. Any thoughts? I had planned on replacing all of the fuel lines.


Not advise I would take.
The tunnel lines do fail and then you are sitting in a car with fuel inside with you. Not someplace I want to be.
They are almost 50 year old plastic not designed to hold the pressure of the Fuel Injection system, just the weight of the fuel in the tank. If you move the pump up front you are now running high pressure fuel through the plastic line.

Does AA even sell the SS lines?

Jim
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windforfun
post Sep 21 2021, 06:07 PM
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QUOTE(jcd914 @ Sep 21 2021, 04:59 PM) *

QUOTE(Joec @ Sep 21 2021, 03:12 PM) *

All ready to order new stainless fuel lines for the tunnel and after talking to Auto Atlanta they suggest not replacing the lines in the tunnel as they are not prone to failure. Any thoughts? I had planned on replacing all of the fuel lines.


Not advise I would take.
The tunnel lines do fail and then you are sitting in a car with fuel inside with you. Not someplace I want to be.
They are almost 50 year old plastic not designed to hold the pressure of the Fuel Injection system, just the weight of the fuel in the tank. If you move the pump up front you are now running high pressure fuel through the plastic line.

Does AA even sell the SS lines?

Jim


Several older mechanics from Europe who have worked on 914s for many years have told me that the plastic fuel lines are bullet proof. Go figure. The added pressure may be an issue. BTW, it's advice, not advise.
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windforfun
post Sep 21 2021, 06:09 PM
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QUOTE(mlindner @ Jul 22 2021, 12:36 PM) *

Joec, mine in a 914-6 GT Tribute for track but still streetable. For easy access I put the fuel pump in the front trunk. Best, MarkAttached Image


People tell me that these kind of hose clamps produce leaks. To that I say it depends upon the kind of hose that you're using. I've used these kind of clamps for decades with no issues whatsoever.
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windforfun
post Sep 21 2021, 06:11 PM
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QUOTE(914Sixer @ Jul 24 2021, 05:04 AM) *

PLEASE do not use worm gear clamps on fuel lines. Use fuel line band clamps only


Nope. I disagree. The right fuel hose works just fine with those kind of clamps.
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