Flushing out fuel rail - ZR-1 Net Registry Forums

DTZ ZR1 · 08-02-2009

I will pulling the injectors out today and replacing them. What is the best method to flush out fuel?

DT

secondchance · 08-02-2009

Quote:

Originally Posted by DTZ ZR1

I will pulling the injectors out today and replacing them. What is the best method to flush out fuel?

DT

Any reason you want to flush out fuel? Has it been sitting for a long time?

tpepmeie · 08-02-2009

Word of advice... don't forget to remove gas cap to vent the tank pressure. you will have quite a mess otherwise. ask me how I know

Todd

A26B · 08-02-2009

Quote:

Originally Posted by tpepmeie

Word of advice... don't forget to remove gas cap to vent the tank pressure. you will have quite a mess otherwise. ask me how I know

Todd

+1 from me! I made that mistake doing a fuel filter change. Gas really burns underarms

ZR1Vette · 08-02-2009

I think it is worth while to clean out the fuel rails...I used a carb cleaner (being fuel system friendly) and then compress air to blow out everything. Place the rails on a slight incline with 'B' at the bottom and start shooting in the clean so it runs out at the last injector site (marked 'B') and also make sure you blow starting with the injector seat (marked 'A') closest to fuel rail cross overs and blow downwards away from the cross overs towards 'B'.

Reason I did clean was because there was a brownish residual from the gasoline (some call it varnish) and once cleaned looked like this>>

Also, be careful not to flex/strain the fuel rail cross overs/seats...they do wiggle easily.

To depressurize the fuel system in addition to what has been noted (open gas cap) also release pressure at the fuel rail shrader valve.

vettn71 · 08-02-2009

I installed new injectors, just to have one misfire due to trash in the rail. It's goos insurance against another pull.

Jim

DTZ ZR1 · 08-02-2009

The guy I bought the car from said it has been sitting for 5 years. He said he bought the car and put it in his barn and that was it. I will flush out the rails, thanks for the info.

DT

Z51JEFF · 08-03-2009

Why not just go ahead and take the thing completely apart,replace O rings at the reg and lines,get a good look at everything.

ZR1Vette · 08-03-2009

Well do you do it and at what $$.. yes I agree with the concept of replacing everything but in this case did not thinking it was necessary

A26B · 08-03-2009

Cost is $8.28 for a set of 9 o-rings to do the rail/regulator fuel lines.

It's kind of a PITA to do, but as old as our cars are getting, these soft goods need to be replaced. I don't see the need every time, but if it hasn't been done yet, then I would say it's time. Fuel leaks are bad news and can be dangerous and expensive.

I've probably given away 100 sets of fuel block o-rings since starting the gasket business....as a way of saying thanks to customers and because it's a safety item.

08-02-2009	#1
DTZ ZR1 Join Date: Jan 2009 Location: Mansfield, OH Posts: 28	Flushing out fuel rail I will pulling the injectors out today and replacing them. What is the best method to flush out fuel? DT __________________ [FONT=Times New Roman]DT[/FONT] [FONT=Times New Roman]'90 Red ZR-1 #2300 LT-5[/FONT] [FONT=Times New Roman]'85 Bronze (Almost complete)[/FONT]

08-02-2009	#3
tpepmeie Join Date: Aug 2005 Location: Fishers, IN Posts: 815	Re: Flushing out fuel rail Word of advice... don't forget to remove gas cap to vent the tank pressure. you will have quite a mess otherwise. ask me how I know Todd

08-02-2009	#5
ZR1Vette Join Date: Dec 2007 Location: Reston, Virginia Posts: 939	Re: Flushing out fuel rail I think it is worth while to clean out the fuel rails...I used a carb cleaner (being fuel system friendly) and then compress air to blow out everything. Place the rails on a slight incline with 'B' at the bottom and start shooting in the clean so it runs out at the last injector site (marked 'B') and also make sure you blow starting with the injector seat (marked 'A') closest to fuel rail cross overs and blow downwards away from the cross overs towards 'B'. Reason I did clean was because there was a brownish residual from the gasoline (some call it varnish) and once cleaned looked like this>> Also, be careful not to flex/strain the fuel rail cross overs/seats...they do wiggle easily. To depressurize the fuel system in addition to what has been noted (open gas cap) also release pressure at the fuel rail shrader valve. __________________ Michael :cheers: [I][SIZE="2"]1990 RED on RED #566[/SIZE][/I] [I][SIZE="2"]WAZOO MEMBER[/I][/SIZE] Last edited by ZR1Vette; 08-02-2009 at 05:50 PM.

08-02-2009	#6
vettn71 Join Date: Oct 2008 Location: Colleyville, TX Posts: 272	Re: Flushing out fuel rail I installed new injectors, just to have one misfire due to trash in the rail. It's goos insurance against another pull. Jim

08-02-2009	#7
DTZ ZR1 Join Date: Jan 2009 Location: Mansfield, OH Posts: 28	Re: Flushing out fuel rail The guy I bought the car from said it has been sitting for 5 years. He said he bought the car and put it in his barn and that was it. I will flush out the rails, thanks for the info. DT __________________ [FONT=Times New Roman]DT[/FONT] [FONT=Times New Roman]'90 Red ZR-1 #2300 LT-5[/FONT] [FONT=Times New Roman]'85 Bronze (Almost complete)[/FONT]

08-03-2009	#8
Z51JEFF Join Date: Dec 2007 Location: Fremont,Ca Posts: 3,078	Re: Flushing out fuel rail Why not just go ahead and take the thing completely apart,replace O rings at the reg and lines,get a good look at everything.

08-03-2009	#9
ZR1Vette Join Date: Dec 2007 Location: Reston, Virginia Posts: 939	Re: Flushing out fuel rail Well do you do it and at what $$.. yes I agree with the concept of replacing everything but in this case did not thinking it was necessary __________________ Michael :cheers: [I][SIZE="2"]1990 RED on RED #566[/SIZE][/I] [I][SIZE="2"]WAZOO MEMBER[/I][/SIZE]

08-03-2009	#10
A26B Join Date: Dec 2003 Location: Arcadia,OK Posts: 3,394	Re: Flushing out fuel rail Cost is $8.28 for a set of 9 o-rings to do the rail/regulator fuel lines. It's kind of a PITA to do, but as old as our cars are getting, these soft goods need to be replaced. I don't see the need every time, but if it hasn't been done yet, then I would say it's time. Fuel leaks are bad news and can be dangerous and expensive. I've probably given away 100 sets of fuel block o-rings since starting the gasket business....as a way of saying thanks to customers and because it's a safety item. __________________ Jerry Downey JERRYS LT5 GASKETS & PARTS http://www.jerrysgaskets.com 1994 *ZR-1*, Black/Black, Lingenfelter Aerobody, 416cu in, 3.91 gears, coil-over susp, Brembo brakes, etc. 2016 Black-Red, 3LT-Z51 Auto 8-speed.