|
|
|
|
| Author |
|
|
Registered
Join Date: Sep 2002
Posts: 513
|
Vacuum line safe for fuel? (MFI cold start)
I call PP to buy some fuel line for the cold start system on my 69E with MFI and the sales person said to use regular vacuum line. This is for the line which connects the cold start solenoid to the air filter housing.
Is this safe?
__________________
'69 911E 2.7MFI ;996TT;987.2 CaymanS '71 Volvo P1800E wife's; AMG SLK wife's '71 Volvo race car 944S; 986S ; 734WHP drift car (son's) |
||
04-03-2006, 06:36 AM
|
|
|
Autodidactic user
Join Date: May 2003
Location: Summerfield, NC
Posts: 1,298
|
I've always been tought that you can only use approved synthetic rubber hoses in a fuel system. They are specifically made to resist breaking down while carrying fuel. Vacuum hose is NOT made to these specifications and thus should never be used as fuel hose.
__________________
Please help the MFI community keep the Ultimate MFI resources thread and the Mechanical fuel injection resource index up to date. Send me a PM and I'll add your materials and suggestions.  1973 911E Targa (MFI) |
||
|
04-03-2006, 06:52 AM
|
|
|
Back in the saddle again
Join Date: Oct 2001
Location: Central TX west of Houston
Posts: 56,488
|
No, vacuum is not made for fuel. You need fuel line for that.
__________________
Steve '08 Boxster RS60 Spyder #0099/1960 - never named a car before, but this is Charlotte. '88 targa  SOLD 2004 - gone but not forgotten
|
||
|
04-03-2006, 06:53 AM
|
|
|
Registered
Join Date: Jan 2002
Location: Long Beach CA, the sewer by the sea.
Posts: 37,989
|
I believe what Pelican carries is rated for fuel. They get braided stuff that looks good. Sometimes it can say BMW on it, which I didn't care for and they replaced it. But, the replacement was grey in color, not the black that came off the car.
Anyway, I don't see why they would carry two different types since the fuel line is stout and won't collapse under vacuum. Talk to another salesperson. Try Glenn @ x240 unless that is whom you talked to in the first place. |
||
|
04-03-2006, 09:20 AM
|
|
|
Registered
Join Date: May 2001
Location: Peoples Republic of Long Beach, NY
Posts: 21,140
|
routine fuel hose has braiding internally.
I don't know what diameter you need but 1/4" gas line is available from lawn mower repair shops and very rarely at auto supply shops.
__________________
Ronin LB '77 911s 2.7 PMO E 8.5 SSI Monty MSD JPI w x6 |
||
|
04-03-2006, 09:31 AM
|
|
|
Registered
Join Date: May 2003
Posts: 3,346
|
I used vacuum line on my MFI cold start circuit. It's not a suitable long term solution. The lines got hard and I suspect if you use them for more than a few months they would leak or contaminate the injectors. Mine was generic vacuum line from Autozone.
-Andy
__________________
72 Carrera RS replica, Spec 911 racer |
||
|
04-03-2006, 12:04 PM
|
|
|
|
Registered
Join Date: Dec 2003
Location: Arapahoe County, Colorado, USA
Posts: 9,032
|
This is a common VW, Porsche … German hose. It is 4.5 x 9.5 mm Porsche part number 999.180.120.50 sold by the meter. I would think Pelican Parts has it.
Be sure and use the Norma Schellen hose clamps 999.512.082.02. Common worm clamps can damage the fuel hose and cause a gasoline leak. I agree, never use vacuum line. Best, Grady
__________________
ANSWER PRICE LIST (as seen in someone's shop) Answers - - - - - - - - - - - - - - - - $0.75 Answers (requiring thought) - - - - $1.25 Answers (correct) - - - - - - - - - - $12.50 |
||
|
04-03-2006, 12:21 PM
|
|
|
Registered
Join Date: May 2000
Location: Los Alamos, NM, USA
Posts: 6,044
|
The "vacuum line" Pelican sells is the externally braided German stuff. It is the same as what came on the 911's originally. It is rated for CIS fuel service. I have used it for CIS fuel service for five years without incident. Jim
|
||
|
04-03-2006, 12:42 PM
|
|
|
Registered
Join Date: May 2000
Location: Los Alamos, NM, USA
Posts: 6,044
|
The below image shows a CIS system "re-hosed" with the Pelican braided vacuum/fuel line. Some of the lines contain hot CIS pressure gasoline and some carry "vacuum". The correct clamps were used where available.
|
||
|
04-03-2006, 12:49 PM
|
|
