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Re: Adding a fuel-pressure check port
stilllearning wrote:
> I do not have any problems; I was thinking of putting in a fuel port > as a pro-active measure. I would like to study the pressure patterns > at idle, during winter, while accelerating and such, so that when a > problem occurs, I am somewhat prepared. The problem could be fuel > pump, fuel regulator, leaks and such. Moreover, when the car stalls, > the problem could or could not be fuel pressure related. Ok.. this is what your going to see. ign on -- idealy a few psi from the last shutdown followed by a run up to operating psi start/idle -- basic static pressure running -- basic static pressure wide open -- a couple more psi (depends on the year) shutdown -- a slow but steady build as fuel in the rail expands due to heat. Followed by a return to normal and a very slow decrease Nothing apart from a very sensitive electronic sensor and scope could detect injector firing. About the only things of interest are 1) lower fuel pressure on acceleration - clogged fuel filter - bad pressure regulator (which for your model is in the pump) - worn pump 2) slow decrease in pressure with engine off - leaking fuel system or injector Your probably better off buying a good scantool and learning how to use it. Most of the stuff is monitored by the compooter these days. -- -- DougW -- 93 ZJ 4.0 http://revbeergoggles.com HESCO Supercharger - 300W IASCA Stereo - Edelbrock IAS Shocks Gibson Exhaust - rear DCpower - custom gauge install - Stillen Rotors Banks Header - and BEER, in the fridge! |
Re: Adding a fuel-pressure check port
stilllearning wrote:
> I do not have any problems; I was thinking of putting in a fuel port > as a pro-active measure. I would like to study the pressure patterns > at idle, during winter, while accelerating and such, so that when a > problem occurs, I am somewhat prepared. The problem could be fuel > pump, fuel regulator, leaks and such. Moreover, when the car stalls, > the problem could or could not be fuel pressure related. Ok.. this is what your going to see. ign on -- idealy a few psi from the last shutdown followed by a run up to operating psi start/idle -- basic static pressure running -- basic static pressure wide open -- a couple more psi (depends on the year) shutdown -- a slow but steady build as fuel in the rail expands due to heat. Followed by a return to normal and a very slow decrease Nothing apart from a very sensitive electronic sensor and scope could detect injector firing. About the only things of interest are 1) lower fuel pressure on acceleration - clogged fuel filter - bad pressure regulator (which for your model is in the pump) - worn pump 2) slow decrease in pressure with engine off - leaking fuel system or injector Your probably better off buying a good scantool and learning how to use it. Most of the stuff is monitored by the compooter these days. -- -- DougW -- 93 ZJ 4.0 http://revbeergoggles.com HESCO Supercharger - 300W IASCA Stereo - Edelbrock IAS Shocks Gibson Exhaust - rear DCpower - custom gauge install - Stillen Rotors Banks Header - and BEER, in the fridge! |
Re: Adding a fuel-pressure check port
stilllearning wrote:
> I do not have any problems; I was thinking of putting in a fuel port > as a pro-active measure. I would like to study the pressure patterns > at idle, during winter, while accelerating and such, so that when a > problem occurs, I am somewhat prepared. The problem could be fuel > pump, fuel regulator, leaks and such. Moreover, when the car stalls, > the problem could or could not be fuel pressure related. Ok.. this is what your going to see. ign on -- idealy a few psi from the last shutdown followed by a run up to operating psi start/idle -- basic static pressure running -- basic static pressure wide open -- a couple more psi (depends on the year) shutdown -- a slow but steady build as fuel in the rail expands due to heat. Followed by a return to normal and a very slow decrease Nothing apart from a very sensitive electronic sensor and scope could detect injector firing. About the only things of interest are 1) lower fuel pressure on acceleration - clogged fuel filter - bad pressure regulator (which for your model is in the pump) - worn pump 2) slow decrease in pressure with engine off - leaking fuel system or injector Your probably better off buying a good scantool and learning how to use it. Most of the stuff is monitored by the compooter these days. -- -- DougW -- 93 ZJ 4.0 http://revbeergoggles.com HESCO Supercharger - 300W IASCA Stereo - Edelbrock IAS Shocks Gibson Exhaust - rear DCpower - custom gauge install - Stillen Rotors Banks Header - and BEER, in the fridge! |
Re: Adding a fuel-pressure check port
Are you certain there is no test port? Maybe they did away with them, but
there is one on my '00 Wrangler with the same engine. It's on the fuel rail. "stilllearning" <shahswim@yahoo.com> wrote in message news:1180913828.509284.108770@p77g2000hsh.googlegr oups.com... > On Jun 3, 5:38 pm, bllsht <nos...@dot.net> wrote: >> Rather than creating a potential leak problem, you'd be better off >> buying or making an adapter you could insert between the line and the >> rail to check pressure. You don't need a permanent test port. >> >> On Sun, 03 Jun 2007 10:38:25 -0700, stilllearning <shahs...@yahoo.com> >> wrote: >> >> >> >> >I occasionally want to measure fuel pressure on my Jeep WJ 2004 4.0L >> >I6. I am looking at installing a Schrader valve - the Jeep deosn't >> >seem to have one. Can anyone provide suggestions on where to put a >> >schrader valve and how? I was thinking of cutting the plastic hose >> >close to where the fuel enters the fuel rail, inserting a 1/8" NPT >> >brass T with a Schrader valve in the middle, and clamping with two >> >screw-clamps. Any safety issues here? Is there a better long-term or >> >safer solution? >> >> >Also, occasionally, I would like to be able to check pressure while >> >accelerating etc. Is it worth installing an electrical sending unit so >> >I can connect a couple of cables and a gauge and stick them to the >> >windshied when testing? >> >> >Thank you.- Hide quoted text - >> >> - Show quoted text - > > Here is the connector at the fuel rail: > > http://new.photos.yahoo.com/shahswim...804411800994/0 > > Is there an adapter available? > |
Re: Adding a fuel-pressure check port
Are you certain there is no test port? Maybe they did away with them, but
there is one on my '00 Wrangler with the same engine. It's on the fuel rail. "stilllearning" <shahswim@yahoo.com> wrote in message news:1180913828.509284.108770@p77g2000hsh.googlegr oups.com... > On Jun 3, 5:38 pm, bllsht <nos...@dot.net> wrote: >> Rather than creating a potential leak problem, you'd be better off >> buying or making an adapter you could insert between the line and the >> rail to check pressure. You don't need a permanent test port. >> >> On Sun, 03 Jun 2007 10:38:25 -0700, stilllearning <shahs...@yahoo.com> >> wrote: >> >> >> >> >I occasionally want to measure fuel pressure on my Jeep WJ 2004 4.0L >> >I6. I am looking at installing a Schrader valve - the Jeep deosn't >> >seem to have one. Can anyone provide suggestions on where to put a >> >schrader valve and how? I was thinking of cutting the plastic hose >> >close to where the fuel enters the fuel rail, inserting a 1/8" NPT >> >brass T with a Schrader valve in the middle, and clamping with two >> >screw-clamps. Any safety issues here? Is there a better long-term or >> >safer solution? >> >> >Also, occasionally, I would like to be able to check pressure while >> >accelerating etc. Is it worth installing an electrical sending unit so >> >I can connect a couple of cables and a gauge and stick them to the >> >windshied when testing? >> >> >Thank you.- Hide quoted text - >> >> - Show quoted text - > > Here is the connector at the fuel rail: > > http://new.photos.yahoo.com/shahswim...804411800994/0 > > Is there an adapter available? > |
Re: Adding a fuel-pressure check port
Are you certain there is no test port? Maybe they did away with them, but
there is one on my '00 Wrangler with the same engine. It's on the fuel rail. "stilllearning" <shahswim@yahoo.com> wrote in message news:1180913828.509284.108770@p77g2000hsh.googlegr oups.com... > On Jun 3, 5:38 pm, bllsht <nos...@dot.net> wrote: >> Rather than creating a potential leak problem, you'd be better off >> buying or making an adapter you could insert between the line and the >> rail to check pressure. You don't need a permanent test port. >> >> On Sun, 03 Jun 2007 10:38:25 -0700, stilllearning <shahs...@yahoo.com> >> wrote: >> >> >> >> >I occasionally want to measure fuel pressure on my Jeep WJ 2004 4.0L >> >I6. I am looking at installing a Schrader valve - the Jeep deosn't >> >seem to have one. Can anyone provide suggestions on where to put a >> >schrader valve and how? I was thinking of cutting the plastic hose >> >close to where the fuel enters the fuel rail, inserting a 1/8" NPT >> >brass T with a Schrader valve in the middle, and clamping with two >> >screw-clamps. Any safety issues here? Is there a better long-term or >> >safer solution? >> >> >Also, occasionally, I would like to be able to check pressure while >> >accelerating etc. Is it worth installing an electrical sending unit so >> >I can connect a couple of cables and a gauge and stick them to the >> >windshied when testing? >> >> >Thank you.- Hide quoted text - >> >> - Show quoted text - > > Here is the connector at the fuel rail: > > http://new.photos.yahoo.com/shahswim...804411800994/0 > > Is there an adapter available? > |
Re: Adding a fuel-pressure check port
Are you certain there is no test port? Maybe they did away with them, but
there is one on my '00 Wrangler with the same engine. It's on the fuel rail. "stilllearning" <shahswim@yahoo.com> wrote in message news:1180913828.509284.108770@p77g2000hsh.googlegr oups.com... > On Jun 3, 5:38 pm, bllsht <nos...@dot.net> wrote: >> Rather than creating a potential leak problem, you'd be better off >> buying or making an adapter you could insert between the line and the >> rail to check pressure. You don't need a permanent test port. >> >> On Sun, 03 Jun 2007 10:38:25 -0700, stilllearning <shahs...@yahoo.com> >> wrote: >> >> >> >> >I occasionally want to measure fuel pressure on my Jeep WJ 2004 4.0L >> >I6. I am looking at installing a Schrader valve - the Jeep deosn't >> >seem to have one. Can anyone provide suggestions on where to put a >> >schrader valve and how? I was thinking of cutting the plastic hose >> >close to where the fuel enters the fuel rail, inserting a 1/8" NPT >> >brass T with a Schrader valve in the middle, and clamping with two >> >screw-clamps. Any safety issues here? Is there a better long-term or >> >safer solution? >> >> >Also, occasionally, I would like to be able to check pressure while >> >accelerating etc. Is it worth installing an electrical sending unit so >> >I can connect a couple of cables and a gauge and stick them to the >> >windshied when testing? >> >> >Thank you.- Hide quoted text - >> >> - Show quoted text - > > Here is the connector at the fuel rail: > > http://new.photos.yahoo.com/shahswim...804411800994/0 > > Is there an adapter available? > |
Re: Adding a fuel-pressure check port
Matt Macchiarolo wrote:
> Are you certain there is no test port? Maybe they did away with them, > but there is one on my '00 Wrangler with the same engine. It's on the > fuel rail. Yea.. they ditched the check port sometime in 05 I think. -- DougW |
Re: Adding a fuel-pressure check port
Matt Macchiarolo wrote:
> Are you certain there is no test port? Maybe they did away with them, > but there is one on my '00 Wrangler with the same engine. It's on the > fuel rail. Yea.. they ditched the check port sometime in 05 I think. -- DougW |
Re: Adding a fuel-pressure check port
Matt Macchiarolo wrote:
> Are you certain there is no test port? Maybe they did away with them, > but there is one on my '00 Wrangler with the same engine. It's on the > fuel rail. Yea.. they ditched the check port sometime in 05 I think. -- DougW |
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