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I have a mark optimax 150 that won't start fuel pressure is 80 psi and so is the air pressure 80 psi both injector pumps seem to run fine and I have replaced all the rubbers in the pump housing

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: car doesn't seem to get enough gas to engine

Have you done a tune lately on the car?
I would also suspect a fuel pump problem is you've done a tune up recently.

Posted on Jul 11, 2008

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SOURCE: f-150 xlt lariat...5.0 starts..runs about 5 minutes, quits

could have plugged injectors

Posted on Feb 04, 2009

motor1258
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SOURCE: What is the correct fuel pressure on a 96 Dodge grand Caravan?

Don't have access to actual pressure required at this moment but I will tell you that 12-20 psi is definitely not enough. Your probably looking at a minimum of 50-60, and as much as 90-100 depending on what engine. A replacement for a 3.3.L at autozone is rated at 90-100 psi. I'd spend the money on new pump & filter at same time.

Posted on Mar 23, 2009

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SOURCE: 89 GMC K2500 5.7L TBI not spraying fuel

have you checked the coolant temp sensor? it controls air-fuel mixture.

Posted on Feb 04, 2010

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SOURCE: 1988 silverado, tbi 350 has 12 psi fuel pressure,

Fuel pressure is a little low, check the pressure regulator, and the fuel filter

Posted on Mar 09, 2010

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I have a 1997 suzuki sidekick JX 4×4 and it was running fine I had the computer checked and the o2 sensor and a calorie converter needed to be changed so I did that and it was running great and I turned it...


wont crank or cranks fast but will not start???????????????
2door or 4 doors? (wired diffr they are)
its an old car, and most fail this old. "entropy"
first off, 3 things must be good on this old engine.
1: compression. at above 150 psi, 180 warm not 80.
if compression is low an all 4 cylinders (G16b engine) the cam belt slipped, do to owers not changing belt at 60,000 miles !
2: bad spark, test for spark at all 4 cylinder yet? if bad spark
use a scan tool and see why, cranking for 5 seconds. P03xx errors?
at this point the engine runs on test fuel. does it?

3: bad fueling , too much or too little or none)
is engine flooding, spark tips wet,
no dry, and test fuel runs car for 3 seconds.
ok that means the pump is dead, or weak
caused by (again a real 60k tuneup skipped, the filter)
replace filter. omg got 30psi pump pressure,
lets say pump pressure is still weak, lets say 15psi, (failed)
i check pump voltage cranking, omg, got 8v. the wires
behind left rear tail light (2door) pink wires or ground there bad.
ok got 12vdc to pump. but is weak
i then check FPR, fuel pump reg on fuel rail. i find it is stuck wide open, a new FPR gets pressure to 30 running and 40 not running.
fixed.
no the FPR is ok, the pump is bad. (last, pumps is last in my book as the work is long and hard, and why do that if , its not bad. as most all seem to do on forums.)

no start has 50 causes.
see scotty do the TEST FUEL test.

http://www.fixkick.com/nostart.html


we dont know what checked filter and pump means.
1: filter is there and looks pretty?
2: pump makes noise?
we use a fuel pressure gauge for 20 bucks.

all 9 pump tests are here, and the there tests for injector leakdown
and injector balance tests. all off one tool.
not starting can even be, leaking injector, folding 1 cylinder bad.

http://www.fixkick.com/INJECTORS/pump.html

Mar 23, 2015 | 1997 Suzuki Sidekick

1 Answer

Nissan xterra 2002 2.5L engine 4 cyl engine just stopped turn key can hear fuel pump turn on and spark plug and wires there's spark also checked compression test cylinders are fine 150 psi each also...


with a compression of 150 psi the timing belt will be in the right place so that can be eliminated . you need 3 things to make an engine run they are compression ( which you have plenty of --- fuel you can hear the pump but are you getting pressure in the fuel manifold and lastly spark. So have a pressure test done on the fuel manifold top check for pressure regulator --pump/ filter faults . Next check for spark at a plug lead. Check that the injectors are working . Missing just 1 of the 3 will not run an engine.

Feb 09, 2014 | 2001 Mitsubishi Galant

1 Answer

1989 ford f-150 start but stalls out


Injector require 40 PSI on a Ford. Your Fuel Pump is BAD

Apr 08, 2013 | 1989 Ford F 150

1 Answer

Wont start unless I spray starting fluid into air cleaner. run great after that but if you turn it off you have to use starting fluid again . have put new wires plugs rotor cap distb. capand K&N...


A poor spray pattern in the injectors can cause starting issues. Have you tried a good (read not really cheap) fuel injector cleaner like Chevron Techron or Valvoline Synpower fuel system cleaner? A weak ignition system (worn spark plugs, leaking wires) can cause starting issues. You mentioned that it has a K&N filter on it. These filters use an oil in a cotton media to filter out dirt. Sometimes that oil can get out of the filter and contaminate the mass air-flow sensor. Follow the air tube after the filter box and you'll find a sensor in the tube with several wires running from it. It is made from aluminum and the wire housing is plastic. Remove it from the tube and clean it with a mass air-flow sensor cleaner. You HAVE to use a mass air-flow sensor cleaner specifically made for mass air sensors. Don't use anything else like carb, brake, or throttle body cleaner. Those cleaners will leave a residue on the sensor and just cause you more issues.

As for your fuel pressure, the system pressure with the key on, engine off is 60-66 psi. Do you really think you could visually tell the difference between 60 psi and 40 psi? I know I couldn't. You'll have to use a fuel pressure gauge to verify the pressure. For my money, I think your pressure is low. But, cleaning the MAF is much easier then putting a tester in, and it wouldn't hurt, so I would do that first.

Dec 07, 2011 | 1999 Chevrolet Tahoe

3 Answers

1989 Ford Ranger 2.3l. Won't start. Does not have injector pulse. Has spark on all 4 passenger side wires. Has at least some fuel pressure. Timing and belt good. This was a progressive problem in that...


The fuel pressure has to to 35 to 45 psi. And no low fuel pressure will not cause no injector pulse.The veicle sounds more like a idle air control problem why? because as you stated it runs rough when it does start.Get it to start sysle the key you will hear the fuel pump go on cycle it three times then start it up. when the vehicle warms up take the idle air valve out and clean it with carburator cleaner or even brake cleaner you may even want to do the throttle body itself this should help with the hard start up and rough running

Aug 15, 2011 | Ford Ranger Cars & Trucks

2 Answers

With 220,000 miles i thought it jumped time but half way home i pull up to redlight and just sitting at idle and engine dies out like no fuel. so i get it started just to go about 150 yards and it starts...


If you have spark and the fuel line is flowing gas it still may not have enough pressure 35-40 PSI is normal and has to be tested with a gaquge. The idea the the timing jumped is a good one and a comression test can find it as the compression wiil be low on all cyclinders. 150 PSI is normal good ones as high as 180 PSI and lower than 100 they flat won't run. Adding a little gas to the air inlet as it's being cranked with the key makes it fire up and run breifly tells you it didn't jump time but has an injection problem or low fuel pressure. Make sure that your not out of gas and that the gas that;s init is gas not something else.223873880.jpgThe filter for the fuel looks like this and you might find it has water or **** in it. sugar even. 24734041.jpgBeing the timing set is gears and a chain unless it's been making noise for awhile they are quite reliable and seldom fail without making noise for many thousands of miles. The tensioner can braek making the chain very loose and noisy but you have to pop the clutch or somthing nasty to make them jump. A timing light connected to the number one spark plug and crank to see the mark may find it way off and the compression low so these are the parts pluse the chain that you'll need.1008659640.jpg

Feb 24, 2011 | 2002 Toyota Tacoma

1 Answer

I HAVE A 1997 BLAZER THAT RUNS FINE BELOW 80 DEGREES,BUT WHEN IT IS A HOT DAY MORE THAN 80 THE FUEL PRESSURE DECREASES TO 30 PSI AND DOESNT RUN.JUST WONDERING IF IT IS THE PRESSUE REGULATOR OR THE PUMP ....


It could also be caused by the fuel pump relay. They're cheap and I would start there. There could also be a heat sensitive sensor. Did you scan the computer for codes? If you have a air compressor you could try cooling parts down (excluding the fuel pump but if everything else checks out you know the pump might be going bad) with a gentle blast of air until you find the problem.

Sep 20, 2009 | 1997 Chevrolet Blazer

2 Answers

My suburban is not starting. i replaced the fuel pump since there was no fuel in the line. I tested and the pump was dead. the After installing a new pump car was working great for about 2 minutes then...


Try a fuel pressure test. I once put a brand new from the dealer fuel pump in a 4.3/ When I had pressure, I then replace the injector spider in the vortec engine, to the tune of 500 bucks. I then found out that 10psi was not enough to engage the injector. It had to be 51psi or better. I replace the pump again and it worked fine. It was a hard and expensive lesson. If you do not have a manual for the vehicle, stop by an Advance and check out a Hayes manual. Section 4 on the first page will give you the specks for the fuel system.

Hope this helps.

Aug 28, 2009 | 1997 Chevrolet Suburban

1 Answer

Vw polo 1995 has problem starting. when running its fine but think fuel starvation could be the problem as when key is turned engine only seems to bump the car when accelorator in epressed any ideas....


Several things to attack here... use a gauge to check fuel pressure at the injector manifold... should be 80 psi i believe... also check the fuel pump relay it may not be working right in the "start" position... (yes it's actually two relays in one... one for "start" and one for "run"... test this by attaching a light or meter at the pump terminals (under the car, right rear) if it doesn't light right up (or show battery voltage) when key is turned the problem is definitely electrical... if pressure is low, first replace the filters, if still low then suspect the pump(s). oh did I mention there are two pumps? One is called the transfer pump (in the tank) the other is the high pressure pump. Rule out the high pressure pump before suspecting the transfer pump.
Hope this helps...;-)

Apr 09, 2009 | 1997 Volkswagen Jetta

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